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At least 451 records · Page 25
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Nutrient Inputs Stimulate Mercury Methylation by Syntrophs in a Subarctic Peatland

Climate change dramatically impacts Arctic and subarctic regions, inducing shifts in wetland nutrient regimes as a consequence of thawing permafrost. Altered hydrological regimes may drive changes in the dynamics of microbial mercury (Hg) methylation and bioavailability. Important knowledge gaps remain on the contribution of specific microbial groups to methylmercury (MeHg) production in wetlands of various trophic status. Here, we measured aqueous chemistry, potential methylation rates (k meth ), volatile fatty acid (VFA) dynamics in peat-soil incubations, and genetic potential for Hg methylation across a groundwater-driven nutrient gradient in an interior Alaskan fen. We tested the hypotheses that (1) nutrient inputs will result in increased methylation potentials, and (2) syntrophic interactions contribute to methylation in subarctic wetlands. We observed that concentrations of nutrients, total Hg, and MeHg, abundance of hgcA genes, and rates of methylation in peat incubations (k meth ) were highest near the groundwater input and declined downgradient. hgcA sequences near the input were closely related to those from sulfate-reducing bacteria (SRB), methanogens, and syntrophs. Hg methylation in peat incubations collected near the input source (FPF2) were impacted by the addition of sulfate and some metabolic inhibitors while those down-gradient (FPF5) were not. Sulfate amendment to FPF2 incubations had higher k meth relative to unamended controls despite no effect on k meth from addition of the sulfate reduction inhibitor molybdate. The addition of the methanogenic inhibitor BES (25 mM) led to the accumulation of VFAs, but unlike molybdate, it did not affect Hg methylation rates. Rather, the concurrent additions of BES and molybdate significantly decreased k meth , suggesting a role for interactions between SRB and methanogens in Hg methylation. The reduction in k meth with combined addition of BES and molybdate, and accumulation of VFA in peat incubations containing BES, and a high abundance of syntroph-related hgcAsequences in peat metagenomes provide evidence for MeHg production by microorganisms growing in syntrophy. Collectively the results suggest that wetland nutrient regimes influence the activity of Hg methylating microorganisms and, consequently, Hg methylation rates. Our results provide key information about microbial Hg methylation and methylating communities under nutrient conditions that are expected to become more common as permafrost soils thaw.

59 BASIC BIOLOGICAL SCIENCES↗
NASA NTRS2003

Determination of Mercury Content in a Shallow Firn Core from Summit, Greenland by Isotope Dilution Inductively Coupled Plasma Mass Spectrometry

The total mercury Hg content was determined in 6 cm sections of a near-surface 7 m firn core and in surrounding surface snow from Summit, Greenland (elevation: 3238 m, 72.58 N, 38.53 W) in May 2001 by isotope dilution cold-vapor inductively coupled plasma mass spectrometry (ID-CV-ICP-MS). The focus of this research was to evaluate the capability of the ID-CV-ICPMS technique for measuring trace levels of Hg typical of polar snow and firn. Highly enriched Hg-201 isotopic spike is added to approximately 10 ml melted core and thoroughly mixed. The Hg(+2) in the sample is reduced on line with tin (II) chloride (SnCl2) and the elemental Hg (Hg(0)) vapor pre-concentrated on to gold gauze using a commercial amalgam system. The Hg is then thermally desorbed and introduced into a quadrupole ICP-MS. The blank corrected Hg concentrations determined for all samples ranged from 0.25 ng/L to 1.74 ng/L (ppt) (average 0.59 ng/L plus or minus 0.28 ng/L) and fall within the range of those previously determined by Boutron et al., 1998 (less than or equal to 0.05 ng/L to 2.0 ng/L) for the Summit site. The average blank value was 0.19 ng/L plus or minus 0.045 ng/L (n=6). The Hg values specifically for the firn core range from 0.25 ng/L to 0.87 ng/L (average 0.51 ng/L plus or minus 0.13 ng/L) and show both values declining with time and larger variability in concentration in the top 1.8 m.

Mann, Jacqueline L.↗
DOE OSTI2022

High methylation potential of mercury complexed with mixed thiolate ligands by Geobacter sulfurreducens PCA

We report some thiols, such as cysteine (CYS) at moderate concentrations (10–500 µM), can enhance methylmercury (MeHg) formation by Geobacter sulfurreducens PCA, whereas others such as dithiol 2,3-dimercaptopropanesulfonate (DMPS) and 2,3-dimercaptosuccinic acid (DMSA) abolish mercury [Hg(II)] methylation. Little is known, however, about whether Hg(II) methylation could be enhanced or inhibited by the presence of mixed thiol ligands at low concentrations observed in the environment. Surprisingly we found that mixing CYS (1 µM) with DMPS (0.025–0.5 µM) or DMSA (0.025–1 µM) substantially increased MeHg production by 1.5–3.5-fold, compared to the no-thiol control, whereas complexation with a single DMPS, or DMSA, or CYS (1 µM) strongly inhibited Hg(II) methylation. Pre-equilibration between Hg(II) and thiols before the addition of cells was necessary to observe enhanced methylation. Spectroscopic analyses indicated the formation of mixed or heteroleptic coordinated Hg(II)-S 3 /S 4 complexes, which likely facilitated exchange of Hg(II) with cells and its uptake and internal transfer to the HgcAB proteins required for methylation. These results suggest that the effects of thiols on Hg(II) methylation were more complex than previously thought (using a single thiol) and thus underscore the importance of understanding how mixed thiols and their interactions with Hg(II) may ultimately influence MeHg production in the natural environment.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on Hg3(TeI)2 by Materials Project

Hg3(TeI)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a rectangular see-saw-like geometry to two Te2- and two equivalent I1- atoms. There are one shorter (2.75 Å) and one longer (2.77 Å) Hg–Te bond lengths. There are one shorter (3.12 Å) and one longer (3.30 Å) Hg–I bond lengths. In the second Hg2+ site, Hg2+ is bonded to two Te2- and two I1- atoms to form distorted HgTe2I2 trigonal pyramids that share corners with three equivalent HgTe2I4 octahedra and corners with two equivalent HgTe2I2 tetrahedra. The corner-sharing octahedra tilt angles range from 53–82°. There are one shorter (2.77 Å) and one longer (2.79 Å) Hg–Te bond lengths. There are one shorter (3.04 Å) and one longer (3.25 Å) Hg–I bond lengths. In the third Hg2+ site, Hg2+ is bonded to two equivalent Te2- and four I1- atoms to form corner-sharing HgTe2I4 octahedra. Both Hg–Te bond lengths are 2.73 Å. There are two shorter (3.58 Å) and two longer (3.76 Å) Hg–I bond lengths. In the fourth Hg2+ site, Hg2+ is bonded to two equivalent Te2- and two equivalent I1- atoms to form distorted HgTe2I2 tetrahedra that share corners with two equivalent HgTe2I4 octahedra and corners with four equivalent HgTe2I2 trigonal pyramids. The corner-sharing octahedral tilt angles are 87°. Both Hg–Te bond lengths are 2.78 Å. Both Hg–I bond lengths are 3.11 Å. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. In the second Te2- site, Te2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. There are two inequivalent I1- sites. In the first I1- site, I1- is bonded in a 2-coordinate geometry to three Hg2+ atoms. In the second I1- site, I1- is bonded in a 5-coordinate geometry to four Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg3(SBr)2 by Materials Project

Hg3(SBr)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to two S2- and three Br1- atoms. Both Hg–S bond lengths are 2.46 Å. There are a spread of Hg–Br bond distances ranging from 2.94–3.58 Å. In the second Hg2+ site, Hg2+ is bonded to two S2- and four Br1- atoms to form distorted HgS2Br4 octahedra that share corners with four equivalent HgS2Br4 octahedra, a cornercorner with one HgS2Br3 square pyramid, edges with four equivalent HgS2Br4 octahedra, and an edgeedge with one HgS2Br3 square pyramid. The corner-sharing octahedra tilt angles range from 0–4°. There are one shorter (2.43 Å) and one longer (2.44 Å) Hg–S bond lengths. There are a spread of Hg–Br bond distances ranging from 3.21–3.48 Å. In the third Hg2+ site, Hg2+ is bonded to two equivalent S2- and three Br1- atoms to form a mixture of distorted edge and corner-sharing HgS2Br3 square pyramids. The corner-sharing octahedral tilt angles are 64°. Both Hg–S bond lengths are 2.46 Å. There are a spread of Hg–Br bond distances ranging from 2.94–3.38 Å. In the fourth Hg2+ site, Hg2+ is bonded in a 5-coordinate geometry to two equivalent S2- and three Br1- atoms. Both Hg–S bond lengths are 2.45 Å. There are a spread of Hg–Br bond distances ranging from 3.01–3.31 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. In the second S2- site, S2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. There are five inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 6-coordinate geometry to six Hg2+ atoms. In the second Br1- site, Br1- is bonded in a 5-coordinate geometry to five Hg2+ atoms. In the third Br1- site, Br1- is bonded in a distorted square co-planar geometry to four equivalent Hg2+ atoms. In the fourth Br1- site, Br1- is bonded in a distorted body-centered cubic geometry to eight Hg2+ atoms. In the fifth Br1- site, Br1- is bonded in a distorted trigonal non-coplanar geometry to three Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiAgHg2 by Materials Project

TiAgHg2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ti is bonded to four equivalent Ag and eight equivalent Hg atoms to form TiAg4Hg8 cuboctahedra that share corners with twelve equivalent TiAg4Hg8 cuboctahedra, edges with eight equivalent AgTi4Hg8 cuboctahedra, edges with sixteen equivalent HgTi4Ag4Hg4 cuboctahedra, faces with four equivalent AgTi4Hg8 cuboctahedra, faces with six equivalent TiAg4Hg8 cuboctahedra, and faces with eight equivalent HgTi4Ag4Hg4 cuboctahedra. All Ti–Ag bond lengths are 3.11 Å. All Ti–Hg bond lengths are 3.03 Å. Ag is bonded to four equivalent Ti and eight equivalent Hg atoms to form AgTi4Hg8 cuboctahedra that share corners with twelve equivalent AgTi4Hg8 cuboctahedra, edges with eight equivalent TiAg4Hg8 cuboctahedra, edges with sixteen equivalent HgTi4Ag4Hg4 cuboctahedra, faces with four equivalent TiAg4Hg8 cuboctahedra, faces with six equivalent AgTi4Hg8 cuboctahedra, and faces with eight equivalent HgTi4Ag4Hg4 cuboctahedra. All Ag–Hg bond lengths are 3.03 Å. Hg is bonded to four equivalent Ti, four equivalent Ag, and four equivalent Hg atoms to form distorted HgTi4Ag4Hg4 cuboctahedra that share corners with twelve equivalent HgTi4Ag4Hg4 cuboctahedra, edges with eight equivalent TiAg4Hg8 cuboctahedra, edges with eight equivalent AgTi4Hg8 cuboctahedra, edges with eight equivalent HgTi4Ag4Hg4 cuboctahedra, faces with four equivalent TiAg4Hg8 cuboctahedra, faces with four equivalent AgTi4Hg8 cuboctahedra, and faces with ten equivalent HgTi4Ag4Hg4 cuboctahedra. All Hg–Hg bond lengths are 3.11 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg2NO4 by Materials Project

HgHgONO3 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of four nitric acid molecules and one HgHgO sheet oriented in the (1, 0, 0) direction. In the HgHgO sheet, there are two inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a 2-coordinate geometry to two equivalent O2- atoms. Both Hg–O bond lengths are 2.11 Å. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to two equivalent O2- atoms. There are one shorter (2.20 Å) and one longer (3.02 Å) Hg–O bond lengths. O2- is bonded to four Hg+1.50+ atoms to form a mixture of distorted edge and corner-sharing OHg4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GaHg2SbCl4 by Materials Project

Hg2GaSbCl4 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two Sb3- and four Cl1- atoms. There are one shorter (2.75 Å) and one longer (2.76 Å) Hg–Sb bond lengths. There are a spread of Hg–Cl bond distances ranging from 3.36–3.59 Å. In the second Hg2+ site, Hg2+ is bonded to two Sb3- and four Cl1- atoms to form distorted HgSb2Cl4 octahedra that share a cornercorner with one HgSb2Cl3 square pyramid, corners with four GaCl4 tetrahedra, and a faceface with one HgSb2Cl3 square pyramid. Both Hg–Sb bond lengths are 2.77 Å. There are a spread of Hg–Cl bond distances ranging from 3.25–3.48 Å. In the third Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two Sb3- and four Cl1- atoms. Both Hg–Sb bond lengths are 2.76 Å. There are a spread of Hg–Cl bond distances ranging from 3.19–3.55 Å. In the fourth Hg2+ site, Hg2+ is bonded to two Sb3- and three Cl1- atoms to form distorted HgSb2Cl3 square pyramids that share a cornercorner with one HgSb2Cl4 octahedra, corners with three GaCl4 tetrahedra, and a faceface with one HgSb2Cl4 octahedra. The corner-sharing octahedral tilt angles are 64°. There are one shorter (2.76 Å) and one longer (2.77 Å) Hg–Sb bond lengths. There are a spread of Hg–Cl bond distances ranging from 3.23–3.46 Å. There are two inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded to four Cl1- atoms to form GaCl4 tetrahedra that share corners with two equivalent HgSb2Cl4 octahedra and corners with two equivalent HgSb2Cl3 square pyramids. The corner-sharing octahedra tilt angles range from 36–64°. There are a spread of Ga–Cl bond distances ranging from 2.18–2.22 Å. In the second Ga3+ site, Ga3+ is bonded to four Cl1- atoms to form GaCl4 tetrahedra that share corners with two equivalent HgSb2Cl4 octahedra and a cornercorner with one HgSb2Cl3 square pyramid. The corner-sharing octahedra tilt angles range from 23–77°. There are a spread of Ga–Cl bond distances ranging from 2.19–2.22 Å. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded to four Hg2+ atoms to form corner-sharing SbHg4 tetrahedra. In the second Sb3- site, Sb3- is bonded to four Hg2+ atoms to form corner-sharing SbHg4 tetrahedra. There are eight inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Ga3+ atom. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Ga3+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Hg2+ and one Ga3+ atom. In the fourth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Ga3+ atom. In the fifth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Ga3+ atom. In the sixth Cl1- site, Cl1- is bonded in a single-bond geometry to two Hg2+ and one Ga3+ atom. In the seventh Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Ga3+ atom. In the eighth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Ga3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlHg2SbCl4 by Materials Project

Hg2AlSbCl4 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to two Sb3- and three Cl1- atoms to form distorted HgSb2Cl3 square pyramids that share a cornercorner with one HgSb2Cl4 octahedra, corners with two equivalent HgSb2Cl3 square pyramids, corners with three AlCl4 tetrahedra, and a faceface with one HgSb2Cl4 octahedra. The corner-sharing octahedral tilt angles are 61°. There are one shorter (2.75 Å) and one longer (2.76 Å) Hg–Sb bond lengths. There are a spread of Hg–Cl bond distances ranging from 3.37–3.46 Å. In the second Hg2+ site, Hg2+ is bonded to two Sb3- and four Cl1- atoms to form distorted HgSb2Cl4 octahedra that share corners with two HgSb2Cl3 square pyramids, corners with four AlCl4 tetrahedra, and faces with two HgSb2Cl3 square pyramids. Both Hg–Sb bond lengths are 2.77 Å. There are a spread of Hg–Cl bond distances ranging from 3.24–3.50 Å. In the third Hg2+ site, Hg2+ is bonded to two Sb3- and three Cl1- atoms to form distorted HgSb2Cl3 square pyramids that share a cornercorner with one HgSb2Cl4 octahedra, corners with two equivalent HgSb2Cl3 square pyramids, corners with three AlCl4 tetrahedra, and a faceface with one HgSb2Cl4 octahedra. The corner-sharing octahedral tilt angles are 64°. There are one shorter (2.76 Å) and one longer (2.77 Å) Hg–Sb bond lengths. There are a spread of Hg–Cl bond distances ranging from 3.23–3.48 Å. In the fourth Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two Sb3- and four Cl1- atoms. Both Hg–Sb bond lengths are 2.76 Å. There are a spread of Hg–Cl bond distances ranging from 3.22–3.57 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four Cl1- atoms to form AlCl4 tetrahedra that share corners with two equivalent HgSb2Cl4 octahedra and corners with three HgSb2Cl3 square pyramids. The corner-sharing octahedra tilt angles range from 35–63°. There are a spread of Al–Cl bond distances ranging from 2.14–2.17 Å. In the second Al3+ site, Al3+ is bonded to four Cl1- atoms to form AlCl4 tetrahedra that share corners with two equivalent HgSb2Cl4 octahedra and corners with three HgSb2Cl3 square pyramids. The corner-sharing octahedra tilt angles range from 23–76°. There are a spread of Al–Cl bond distances ranging from 2.15–2.17 Å. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded to four Hg2+ atoms to form corner-sharing SbHg4 tetrahedra. In the second Sb3- site, Sb3- is bonded to four Hg2+ atoms to form corner-sharing SbHg4 tetrahedra. There are eight inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Al3+ atom. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Al3+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Hg2+ and one Al3+ atom. In the fourth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Al3+ atom. In the fifth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Al3+ atom. In the sixth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to two Hg2+ and one Al3+ atom. In the seventh Cl1- site, Cl1- is bonded in a single-bond geometry to one Hg2+ and one Al3+ atom. In the eighth Cl1- site, Cl1- is bonded in a single-bond geometry to two Hg2+ and one Al3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CdHg4(AsI2)2 by Materials Project

(Hg2As)2(CdI4) crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to two As3- and three I1- atoms to form HgAs2I3 trigonal bipyramids that share corners with three equivalent CdI4 tetrahedra, corners with two equivalent HgAs2I3 trigonal bipyramids, and an edgeedge with one HgAs2I3 trigonal bipyramid. Both Hg–As bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.48–3.54 Å. In the second Hg2+ site, Hg2+ is bonded in a distorted rectangular see-saw-like geometry to two As3- and two I1- atoms. There are one shorter (2.57 Å) and one longer (2.58 Å) Hg–As bond lengths. There are one shorter (3.39 Å) and one longer (3.63 Å) Hg–I bond lengths. In the third Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two As3- and four I1- atoms. There are one shorter (2.57 Å) and one longer (2.58 Å) Hg–As bond lengths. There are a spread of Hg–I bond distances ranging from 3.58–3.86 Å. In the fourth Hg2+ site, Hg2+ is bonded to two As3- and three I1- atoms to form distorted HgAs2I3 trigonal bipyramids that share corners with three equivalent CdI4 tetrahedra, corners with two equivalent HgAs2I3 trigonal bipyramids, and an edgeedge with one HgAs2I3 trigonal bipyramid. Both Hg–As bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.44–3.87 Å. Cd2+ is bonded to four I1- atoms to form CdI4 tetrahedra that share corners with six HgAs2I3 trigonal bipyramids. There are a spread of Cd–I bond distances ranging from 2.81–2.87 Å. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded to four Hg2+ atoms to form corner-sharing AsHg4 tetrahedra. In the second As3- site, As3- is bonded to four Hg2+ atoms to form corner-sharing AsHg4 tetrahedra. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom. In the second I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom. In the third I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom. In the fourth I1- site, I1- is bonded in a 1-coordinate geometry to three Hg2+ and one Cd2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg3(SeI)2 by Materials Project

Hg3Se2I2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to two Se2- and four I1- atoms. There are one shorter (2.58 Å) and one longer (2.60 Å) Hg–Se bond lengths. There are a spread of Hg–I bond distances ranging from 3.17–3.93 Å. In the second Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two equivalent Se2- and four I1- atoms. Both Hg–Se bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.22–3.88 Å. In the third Hg2+ site, Hg2+ is bonded to two Se2- and four I1- atoms to form a mixture of distorted corner and edge-sharing HgSe2I4 octahedra. The corner-sharing octahedra tilt angles range from 0–4°. Both Hg–Se bond lengths are 2.57 Å. There are a spread of Hg–I bond distances ranging from 3.40–3.69 Å. In the fourth Hg2+ site, Hg2+ is bonded in a 4-coordinate geometry to two equivalent Se2- and two I1- atoms. Both Hg–Se bond lengths are 2.60 Å. There are one shorter (3.07 Å) and one longer (3.23 Å) Hg–I bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three Hg2+ atoms. There are five inequivalent I1- sites. In the first I1- site, I1- is bonded in a 4-coordinate geometry to four Hg2+ atoms. In the second I1- site, I1- is bonded in a distorted trigonal non-coplanar geometry to three Hg2+ atoms. In the third I1- site, I1- is bonded in a 6-coordinate geometry to six Hg2+ atoms. In the fourth I1- site, I1- is bonded in a 8-coordinate geometry to eight Hg2+ atoms. In the fifth I1- site, I1- is bonded in a 4-coordinate geometry to ten Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ga2(Hg4Te5)3 by Materials Project

Ga2(Hg4Te5)3 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are eight inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to four Te2- atoms to form HgTe4 tetrahedra that share corners with two equivalent GaTe4 tetrahedra and corners with nine HgTe4 tetrahedra. There are a spread of Hg–Te bond distances ranging from 2.85–2.89 Å. In the second Hg2+ site, Hg2+ is bonded to four Te2- atoms to form corner-sharing HgTe4 tetrahedra. There are a spread of Hg–Te bond distances ranging from 2.86–2.88 Å. In the third Hg2+ site, Hg2+ is bonded to four Te2- atoms to form HgTe4 tetrahedra that share corners with two equivalent GaTe4 tetrahedra and corners with nine HgTe4 tetrahedra. There are a spread of Hg–Te bond distances ranging from 2.85–2.89 Å. In the fourth Hg2+ site, Hg2+ is bonded to four Te2- atoms to form corner-sharing HgTe4 tetrahedra. There are two shorter (2.86 Å) and two longer (2.88 Å) Hg–Te bond lengths. In the fifth Hg2+ site, Hg2+ is bonded to four Te2- atoms to form corner-sharing HgTe4 tetrahedra. There are three shorter (2.86 Å) and one longer (2.88 Å) Hg–Te bond lengths. In the sixth Hg2+ site, Hg2+ is bonded to four Te2- atoms to form HgTe4 tetrahedra that share corners with two equivalent GaTe4 tetrahedra and corners with nine HgTe4 tetrahedra. There are a spread of Hg–Te bond distances ranging from 2.79–2.93 Å. In the seventh Hg2+ site, Hg2+ is bonded to four Te2- atoms to form corner-sharing HgTe4 tetrahedra. There are a spread of Hg–Te bond distances ranging from 2.86–2.89 Å. In the eighth Hg2+ site, Hg2+ is bonded to four Te2- atoms to form HgTe4 tetrahedra that share corners with two equivalent GaTe4 tetrahedra and corners with nine HgTe4 tetrahedra. There are a spread of Hg–Te bond distances ranging from 2.79–2.93 Å. Ga3+ is bonded to four Te2- atoms to form GaTe4 tetrahedra that share corners with three equivalent GaTe4 tetrahedra and corners with six HgTe4 tetrahedra. There are one shorter (2.68 Å) and three longer (2.71 Å) Ga–Te bond lengths. There are ten inequivalent Te2- sites. In the first Te2- site, Te2- is bonded to four Hg2+ atoms to form corner-sharing TeHg4 tetrahedra. In the second Te2- site, Te2- is bonded in a distorted trigonal non-coplanar geometry to three Hg2+ atoms. In the third Te2- site, Te2- is bonded to four Hg2+ atoms to form corner-sharing TeHg4 tetrahedra. In the fourth Te2- site, Te2- is bonded in a distorted trigonal non-coplanar geometry to one Hg2+ and two equivalent Ga3+ atoms. In the fifth Te2- site, Te2- is bonded to three Hg2+ and one Ga3+ atom to form corner-sharing TeGaHg3 tetrahedra. In the sixth Te2- site, Te2- is bonded in a distorted trigonal non-coplanar geometry to one Hg2+ and two equivalent Ga3+ atoms. In the seventh Te2- site, Te2- is bonded to four Hg2+ atoms to form corner-sharing TeHg4 tetrahedra. In the eighth Te2- site, Te2- is bonded to four Hg2+ atoms to form corner-sharing TeHg4 tetrahedra. In the ninth Te2- site, Te2- is bonded to four Hg2+ atoms to form corner-sharing TeHg4 tetrahedra. In the tenth Te2- site, Te2- is bonded to four Hg2+ atoms to form corner-sharing TeHg4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfHg4(PCl3)2 by Materials Project

HfHg4(PCl3)2 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. Hf4+ is bonded to six Cl1- atoms to form HfCl6 octahedra that share corners with two equivalent HgP2Cl4 octahedra and an edgeedge with one HgP2Cl4 octahedra. The corner-sharing octahedra tilt angles range from 51–58°. There are a spread of Hf–Cl bond distances ranging from 2.45–2.50 Å. There are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to two P3- and four Cl1- atoms to form distorted HgP2Cl4 octahedra that share corners with two equivalent HfCl6 octahedra, an edgeedge with one HfCl6 octahedra, and an edgeedge with one HgP2Cl4 octahedra. The corner-sharing octahedra tilt angles range from 51–58°. There are one shorter (2.46 Å) and one longer (2.47 Å) Hg–P bond lengths. There are a spread of Hg–Cl bond distances ranging from 3.14–3.32 Å. In the second Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two P3- and four Cl1- atoms. There are one shorter (2.43 Å) and one longer (2.44 Å) Hg–P bond lengths. There are a spread of Hg–Cl bond distances ranging from 3.26–3.52 Å. In the third Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two P3- and four Cl1- atoms. There are one shorter (2.45 Å) and one longer (2.46 Å) Hg–P bond lengths. There are a spread of Hg–Cl bond distances ranging from 3.11–3.45 Å. In the fourth Hg2+ site, Hg2+ is bonded in a distorted square co-planar geometry to two P3- and two Cl1- atoms. There are one shorter (2.44 Å) and one longer (2.45 Å) Hg–P bond lengths. There are one shorter (3.27 Å) and one longer (3.47 Å) Hg–Cl bond lengths. There are two inequivalent P3- sites. In the first P3- site, P3- is bonded to four Hg2+ atoms to form corner-sharing PHg4 tetrahedra. In the second P3- site, P3- is bonded to four Hg2+ atoms to form corner-sharing PHg4 tetrahedra. There are six inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Hf4+ and two Hg2+ atoms. In the second Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Hf4+ and two Hg2+ atoms. In the third Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Hf4+ and two Hg2+ atoms. In the fourth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Hf4+ and two Hg2+ atoms. In the fifth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Hf4+ and four Hg2+ atoms. In the sixth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Hf4+ and two Hg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(InHg)2 by Materials Project

Sr(HgIn)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight equivalent Hg atoms. All Sr–Hg bond lengths are 3.57 Å. Hg is bonded in a 9-coordinate geometry to four equivalent Sr, one Hg, and four equivalent In atoms. The Hg–Hg bond length is 2.85 Å. All Hg–In bond lengths are 3.00 Å. In is bonded to four equivalent Hg atoms to form a mixture of distorted edge and corner-sharing InHg4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaHgPb by Materials Project

BaHgPb crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ba is bonded in a 12-coordinate geometry to six equivalent Hg and six equivalent Pb atoms. There are a spread of Ba–Hg bond distances ranging from 3.65–3.92 Å. There are a spread of Ba–Pb bond distances ranging from 3.66–3.98 Å. Hg is bonded in a 10-coordinate geometry to six equivalent Ba, one Hg, and three equivalent Pb atoms. The Hg–Hg bond length is 2.99 Å. There are two shorter (3.14 Å) and one longer (3.36 Å) Hg–Pb bond lengths. Pb is bonded in a 10-coordinate geometry to six equivalent Ba, three equivalent Hg, and one Pb atom. The Pb–Pb bond length is 3.08 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2HgPb by Materials Project

Na2HgPb crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Na is bonded in a 2-coordinate geometry to four equivalent Hg and four equivalent Pb atoms. There are two shorter (3.47 Å) and two longer (3.69 Å) Na–Hg bond lengths. There are a spread of Na–Pb bond distances ranging from 3.23–3.60 Å. Hg is bonded to eight equivalent Na, two equivalent Hg, and two equivalent Pb atoms to form a mixture of distorted face, edge, and corner-sharing HgNa8Hg2Pb2 cuboctahedra. Both Hg–Hg bond lengths are 3.08 Å. Both Hg–Pb bond lengths are 3.05 Å. Pb is bonded in a 10-coordinate geometry to eight equivalent Na and two equivalent Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb8Hg3Ge43 by Materials Project

Rb8Hg3Ge43 crystallizes in the trigonal R32 space group. The structure is three-dimensional. there are three inequivalent Rb sites. In the first Rb site, Rb is bonded in a 8-coordinate geometry to twenty Ge atoms. There are a spread of Rb–Ge bond distances ranging from 3.51–3.63 Å. In the second Rb site, Rb is bonded in a 12-coordinate geometry to two equivalent Hg and ten Ge atoms. Both Rb–Hg bond lengths are 3.93 Å. There are a spread of Rb–Ge bond distances ranging from 3.77–3.94 Å. In the third Rb site, Rb is bonded in a 12-coordinate geometry to two equivalent Hg and ten Ge atoms. Both Rb–Hg bond lengths are 3.93 Å. There are a spread of Rb–Ge bond distances ranging from 3.76–3.94 Å. Hg is bonded to four Rb and four Ge atoms to form distorted corner-sharing HgRb4Ge4 tetrahedra. All Hg–Ge bond lengths are 2.64 Å. There are nine inequivalent Ge sites. In the first Ge site, Ge is bonded in a 7-coordinate geometry to three Rb and four Ge atoms. There are a spread of Ge–Ge bond distances ranging from 2.55–2.63 Å. In the second Ge site, Ge is bonded in a 7-coordinate geometry to three Rb, one Hg, and three Ge atoms. There are a spread of Ge–Ge bond distances ranging from 2.54–2.61 Å. In the third Ge site, Ge is bonded in a 7-coordinate geometry to three Rb and four Ge atoms. There are two shorter (2.55 Å) and one longer (2.64 Å) Ge–Ge bond lengths. In the fourth Ge site, Ge is bonded in a 7-coordinate geometry to three Rb, one Hg, and three Ge atoms. Both Ge–Ge bond lengths are 2.55 Å. In the fifth Ge site, Ge is bonded in a distorted body-centered cubic geometry to four Rb and four Ge atoms. In the sixth Ge site, Ge is bonded in a 5-coordinate geometry to one Rb and four Ge atoms. The Ge–Ge bond length is 2.53 Å. In the seventh Ge site, Ge is bonded in a 5-coordinate geometry to one Rb and four Ge atoms. The Ge–Ge bond length is 2.60 Å. In the eighth Ge site, Ge is bonded in a 5-coordinate geometry to one Rb and four Ge atoms. The Ge–Ge bond length is 2.57 Å. In the ninth Ge site, Ge is bonded in a 5-coordinate geometry to one Rb and four Ge atoms. The Ge–Ge bond length is 2.55 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrHg4(PCl3)2 by Materials Project

ZrHg4(PCl3)2 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. Zr4+ is bonded to six Cl1- atoms to form ZrCl6 octahedra that share corners with six HgP2Cl4 octahedra and an edgeedge with one HgP2Cl4 octahedra. The corner-sharing octahedra tilt angles range from 39–62°. There are a spread of Zr–Cl bond distances ranging from 2.48–2.53 Å. There are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to two P3- and four Cl1- atoms to form distorted HgP2Cl4 octahedra that share corners with two equivalent ZrCl6 octahedra, an edgeedge with one ZrCl6 octahedra, an edgeedge with one HgP2Cl4 octahedra, and faces with two equivalent HgP2Cl4 octahedra. The corner-sharing octahedra tilt angles range from 51–58°. Both Hg–P bond lengths are 2.47 Å. There are a spread of Hg–Cl bond distances ranging from 3.14–3.30 Å. In the second Hg2+ site, Hg2+ is bonded in a 6-coordinate geometry to two P3- and four Cl1- atoms. Both Hg–P bond lengths are 2.44 Å. There are a spread of Hg–Cl bond distances ranging from 3.25–3.50 Å. In the third Hg2+ site, Hg2+ is bonded to two P3- and four Cl1- atoms to form distorted HgP2Cl4 octahedra that share corners with four equivalent ZrCl6 octahedra, an edgeedge with one HgP2Cl4 octahedra, and faces with two equivalent HgP2Cl4 octahedra. The corner-sharing octahedra tilt angles range from 39–62°. Both Hg–P bond lengths are 2.46 Å. There are a spread of Hg–Cl bond distances ranging from 3.11–3.43 Å. In the fourth Hg2+ site, Hg2+ is bonded in a distorted square co-planar geometry to two P3- and two Cl1- atoms. Both Hg–P bond lengths are 2.44 Å. There are one shorter (3.27 Å) and one longer (3.46 Å) Hg–Cl bond lengths. There are two inequivalent P3- sites. In the first P3- site, P3- is bonded to four Hg2+ atoms to form corner-sharing PHg4 tetrahedra. In the second P3- site, P3- is bonded to four Hg2+ atoms to form corner-sharing PHg4 tetrahedra. There are six inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Zr4+ and four Hg2+ atoms. In the second Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Zr4+ and two Hg2+ atoms. In the third Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Zr4+ and two Hg2+ atoms. In the fourth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Zr4+ and two Hg2+ atoms. In the fifth Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Zr4+ and two Hg2+ atoms. In the sixth Cl1- site, Cl1- is bonded in a distorted single-bond geometry to one Zr4+ and two Hg2+ atoms.

36 MATERIALS SCIENCE↗