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At least 1,207 records · Page 67
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DOE OSTI2020

Materials Data on Li(ZrS2)2 by Materials Project

LiZr2S4 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Li1+ is bonded to six S2- atoms to form LiS6 octahedra that share corners with six equivalent ZrS6 octahedra, edges with two equivalent LiS6 octahedra, and edges with six ZrS6 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. All Li–S bond lengths are 2.64 Å. There are two inequivalent Zr+3.50+ sites. In the first Zr+3.50+ site, Zr+3.50+ is bonded to six S2- atoms to form ZrS6 octahedra that share corners with six equivalent LiS6 octahedra, edges with two equivalent LiS6 octahedra, and edges with six ZrS6 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. There are two shorter (2.58 Å) and four longer (2.61 Å) Zr–S bond lengths. In the second Zr+3.50+ site, Zr+3.50+ is bonded to six S2- atoms to form ZrS6 octahedra that share edges with four equivalent LiS6 octahedra and edges with six ZrS6 octahedra. There are four shorter (2.59 Å) and two longer (2.60 Å) Zr–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to two equivalent Li1+ and three Zr+3.50+ atoms to form a mixture of edge and corner-sharing SLi2Zr3 square pyramids. In the second S2- site, S2- is bonded in a rectangular see-saw-like geometry to one Li1+ and three Zr+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr3NbC4 by Materials Project

Zr3NbC4 is Caswellsilverite-like structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Zr+3.67+ sites. In the first Zr+3.67+ site, Zr+3.67+ is bonded to six C4- atoms to form ZrC6 octahedra that share corners with three equivalent ZrC6 octahedra, corners with three equivalent NbC6 octahedra, edges with three equivalent NbC6 octahedra, and edges with nine ZrC6 octahedra. The corner-sharing octahedra tilt angles range from 0–3°. There are three shorter (2.34 Å) and three longer (2.36 Å) Zr–C bond lengths. In the second Zr+3.67+ site, Zr+3.67+ is bonded to six equivalent C4- atoms to form a mixture of edge and corner-sharing ZrC6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Zr–C bond lengths are 2.35 Å. Nb5+ is bonded to six equivalent C4- atoms to form NbC6 octahedra that share corners with six equivalent ZrC6 octahedra, edges with six equivalent ZrC6 octahedra, and edges with six equivalent NbC6 octahedra. The corner-sharing octahedral tilt angles are 3°. All Nb–C bond lengths are 2.28 Å. There are two inequivalent C4- sites. In the first C4- site, C4- is bonded to three equivalent Zr+3.67+ and three equivalent Nb5+ atoms to form a mixture of edge and corner-sharing CZr3Nb3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the second C4- site, C4- is bonded to six Zr+3.67+ atoms to form a mixture of edge and corner-sharing CZr6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrSn by Materials Project

ZrSn crystallizes in the orthorhombic Pmmn space group. The structure is two-dimensional and consists of one ZrSn sheet oriented in the (0, 0, 1) direction. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded to two equivalent Sn atoms to form distorted corner-sharing ZrSn2 cuboctahedra. Both Zr–Sn bond lengths are 3.17 Å. In the second Zr site, Zr is bonded in a 12-coordinate geometry to six Sn atoms. There are four shorter (3.07 Å) and two longer (3.23 Å) Zr–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 10-coordinate geometry to two equivalent Zr and eight Sn atoms. There are a spread of Sn–Sn bond distances ranging from 3.14–3.43 Å. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six Zr and two equivalent Sn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr3(UGe2)2 by Materials Project

U2Zr3Ge4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. U is bonded in a 7-coordinate geometry to seven Ge atoms. There are a spread of U–Ge bond distances ranging from 2.91–3.22 Å. There are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 6-coordinate geometry to six Ge atoms. There are a spread of Zr–Ge bond distances ranging from 2.72–2.87 Å. In the second Zr site, Zr is bonded to six Ge atoms to form corner-sharing ZrGe6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Zr–Ge bond distances ranging from 2.84–2.92 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent U, four Zr, and one Ge atom. The Ge–Ge bond length is 2.82 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to three equivalent U, five Zr, and one Ge atom. The Ge–Ge bond length is 2.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Experimental and Computational Studies of Carbon–Carbon Bond Formation via Ketonization and Aldol Condensation over Site-Isolated Zirconium Catalysts

We report here the preparation and investigation of isolated Zr centers supported on a high surface area silica for the conversion of carboxylic acids to internal ketones by ketonic decarboxylation (ketonization) and the aldol condensation of ketones to dimeric enones. Catalysts were synthesized by the grafting of Cp 2 ZrCl 2 on the surface of amorphous silica. The connectivity of Zr was characterized by XRD, UV-vis, and Raman spectroscopy. For the lowest Zr loading, Zr is present predominantly as isolated monomeric species. As the Zr loading is increased, a progressively larger fraction of Zr forms oligomeric species and ZrO nanoparticles. Measurements of catalytic activity show that the turnover frequency for carboxylic acid ketonic decarboxylation reaction and aldol condensation of ketones decreases monotonically with increasing Zr loading. An H/D kinetic isotope effect was not observed over isolated Zr catalysts, suggesting that α-H abstraction is not the rate-determining step, rather C-C bond forming may be rate limiting for both reactions. This conclusion is supported by computational modeling of the reaction mechanism. The proposed catalytic cycle for ketonization proceeds via a β-keto acid intermediate on isolated Zr sites that are always coordinatively saturated with C-C bond formation as the rate-limiting step. C-C bond formation is also rate-determining for aldol condensation, with an apparent activation energy that is in good agreement with the experiment if the resting state is a saturated ≡ZrOH site with two adsorbed ketone molecules.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2022

Report summarizing demonstration of thermal conductivity measurement methods for coated zirconium cladding

Thermal diffusivity measurements on Zirconium-based cladding materials have historically been a challenge due to the difficulty to measure on specimens with curved geometries, including nuclear grade Zircaloy cladding materials. In this work, we first used Laser Flash Analysis methods to measure the thermal diffusivity of Zircaloy tubes, which show good agreement with Zircaloy plates in this work, as well as previously published data. The consistent results proved the applicability of the Laser Flash Analysis setup for investigating thermal diffusivity of Zircaloy tubes. We further investigate the hydrogen effect on thermal diffusivity of Zircaloy tubes. Hydrogen plays significant roles in temperature dependent thermal diffusivity trends of Zircaloy tube. For low hydrogen concentration, where hydride dissolved into single phase α-Zr at higher temperature, thermal diffusivity is relatively unchanged at low temperature at two phase regions (α-Zr and δ-hydride), and it increases as a function of temperature at single phase α-Zr region. For high hydrogen concentration, where phase transformation (α-Zr + δ-hydride → α-Zr + β-Zr) occurs at 567 °C, thermal diffusivity decreases as a function of temperature below 567 °C before the transformation (α-Zr and δ-hydride), while increase at higher temperature after the transformation (α-Zr and β-Zr).

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr2Fe3Si by Materials Project

Zr2Fe3Si is Hexagonal Laves-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Zr is bonded in a 12-coordinate geometry to four equivalent Zr, nine equivalent Fe, and three equivalent Si atoms. There are one shorter (3.00 Å) and three longer (3.06 Å) Zr–Zr bond lengths. There are three shorter (2.90 Å) and six longer (2.91 Å) Zr–Fe bond lengths. All Zr–Si bond lengths are 2.93 Å. Fe is bonded to six equivalent Zr, four equivalent Fe, and two equivalent Si atoms to form FeZr6Fe4Si2 cuboctahedra that share corners with four equivalent SiZr6Fe6 cuboctahedra, corners with fourteen equivalent FeZr6Fe4Si2 cuboctahedra, edges with six equivalent FeZr6Fe4Si2 cuboctahedra, faces with six equivalent SiZr6Fe6 cuboctahedra, and faces with twelve equivalent FeZr6Fe4Si2 cuboctahedra. There are two shorter (2.45 Å) and two longer (2.54 Å) Fe–Fe bond lengths. Both Fe–Si bond lengths are 2.49 Å. Si is bonded to six equivalent Zr and six equivalent Fe atoms to form SiZr6Fe6 cuboctahedra that share corners with twelve equivalent FeZr6Fe4Si2 cuboctahedra, edges with six equivalent SiZr6Fe6 cuboctahedra, faces with two equivalent SiZr6Fe6 cuboctahedra, and faces with eighteen equivalent FeZr6Fe4Si2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr2Fe by Materials Project

Zr2Fe crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 12-coordinate geometry to six equivalent Fe atoms. All Zr–Fe bond lengths are 2.71 Å. In the second Zr site, Zr is bonded in a 2-coordinate geometry to four equivalent Fe atoms. There are two shorter (2.71 Å) and two longer (3.10 Å) Zr–Fe bond lengths. Fe is bonded in a 9-coordinate geometry to nine Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr5Ge3 by Materials Project

Zr5Ge3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 5-coordinate geometry to five equivalent Ge atoms. There are a spread of Zr–Ge bond distances ranging from 2.77–3.03 Å. In the second Zr site, Zr is bonded in a 6-coordinate geometry to six equivalent Ge atoms. All Zr–Ge bond lengths are 2.88 Å. Ge is bonded in a 9-coordinate geometry to nine Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr5Sb3 by Materials Project

Zr5Sb3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 5-coordinate geometry to five equivalent Sb atoms. There are a spread of Zr–Sb bond distances ranging from 2.90–3.12 Å. In the second Zr site, Zr is bonded in a 6-coordinate geometry to six equivalent Sb atoms. All Zr–Sb bond lengths are 3.01 Å. Sb is bonded in a 9-coordinate geometry to nine Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr3Co by Materials Project

Zr3Co crystallizes in the orthorhombic Cmcm space group. The structure is one-dimensional and consists of four Zr3Co ribbons oriented in the (1, 0, 0) direction. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 2-coordinate geometry to two equivalent Co atoms. Both Zr–Co bond lengths are 2.64 Å. In the second Zr site, Zr is bonded in a 2-coordinate geometry to two equivalent Co atoms. Both Zr–Co bond lengths are 2.59 Å. Co is bonded in a 6-coordinate geometry to six Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr3Ga2 by Materials Project

Ga2Zr3 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a square co-planar geometry to four equivalent Ga atoms. All Zr–Ga bond lengths are 2.93 Å. In the second Zr site, Zr is bonded in a 6-coordinate geometry to six equivalent Ga atoms. There are two shorter (2.79 Å) and four longer (2.91 Å) Zr–Ga bond lengths. Ga is bonded in a 9-coordinate geometry to eight Zr and one Ga atom. The Ga–Ga bond length is 2.57 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr3Fe by Materials Project

Zr3Fe crystallizes in the orthorhombic Cmcm space group. The structure is one-dimensional and consists of four Zr3Fe ribbons oriented in the (1, 0, 0) direction. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 2-coordinate geometry to two equivalent Fe atoms. Both Zr–Fe bond lengths are 2.60 Å. In the second Zr site, Zr is bonded in a 2-coordinate geometry to two equivalent Fe atoms. Both Zr–Fe bond lengths are 2.65 Å. Fe is bonded in a 6-coordinate geometry to six Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr5Te4 by Materials Project

Zr5Te4 is Titanium telluride structured and crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a distorted square co-planar geometry to four equivalent Te atoms. All Zr–Te bond lengths are 3.11 Å. In the second Zr site, Zr is bonded to five equivalent Te atoms to form a mixture of distorted edge and corner-sharing ZrTe5 trigonal bipyramids. There are two shorter (2.94 Å) and three longer (2.95 Å) Zr–Te bond lengths. Te is bonded in a distorted hexagonal planar geometry to six Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr7(NO2)4 by Materials Project

Zr7N4O8 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Zr4+ sites. In the first Zr4+ site, Zr4+ is bonded to three N3- and four O2- atoms to form distorted ZrN3O4 pentagonal bipyramids that share a cornercorner with one ZrN2O4 octahedra, an edgeedge with one ZrN2O4 octahedra, and edges with two equivalent ZrN3O4 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 50°. There are a spread of Zr–N bond distances ranging from 2.20–2.31 Å. There are a spread of Zr–O bond distances ranging from 2.14–2.51 Å. In the second Zr4+ site, Zr4+ is bonded to two equivalent N3- and four O2- atoms to form a mixture of edge and corner-sharing ZrN2O4 octahedra. Both Zr–N bond lengths are 2.18 Å. There are two shorter (2.09 Å) and two longer (2.16 Å) Zr–O bond lengths. In the third Zr4+ site, Zr4+ is bonded in a 6-coordinate geometry to two N3- and four O2- atoms. There are one shorter (2.08 Å) and one longer (2.12 Å) Zr–N bond lengths. There are a spread of Zr–O bond distances ranging from 2.15–2.36 Å. In the fourth Zr4+ site, Zr4+ is bonded in a 7-coordinate geometry to two equivalent N3- and five O2- atoms. There are one shorter (2.14 Å) and one longer (2.19 Å) Zr–N bond lengths. There are a spread of Zr–O bond distances ranging from 2.14–2.65 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded to four Zr4+ atoms to form distorted NZr4 tetrahedra that share corners with three equivalent OZr4 tetrahedra, corners with four NZr4 tetrahedra, an edgeedge with one NZr4 tetrahedra, and an edgeedge with one OZr4 tetrahedra. In the second N3- site, N3- is bonded to four Zr4+ atoms to form distorted NZr4 tetrahedra that share corners with three equivalent NZr4 tetrahedra, corners with three equivalent OZr4 tetrahedra, an edgeedge with one NZr4 tetrahedra, and an edgeedge with one OZr4 tetrahedra. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to four Zr4+ atoms. In the second O2- site, O2- is bonded to four Zr4+ atoms to form distorted OZr4 tetrahedra that share corners with six NZr4 tetrahedra, an edgeedge with one OZr4 tetrahedra, and edges with two NZr4 tetrahedra. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Zr4+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to four Zr4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr5Sn3 by Materials Project

Zr5Sn3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 6-coordinate geometry to six equivalent Sn atoms. All Zr–Sn bond lengths are 3.01 Å. In the second Zr site, Zr is bonded in a 5-coordinate geometry to five equivalent Sn atoms. There are a spread of Zr–Sn bond distances ranging from 2.93–3.16 Å. Sn is bonded in a 9-coordinate geometry to nine Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm2Zr2O7 by Materials Project

Sm2Zr2O7 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are seven inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded to seven O2- atoms to form SmO7 pentagonal bipyramids that share corners with four ZrO6 octahedra, edges with two equivalent ZrO6 octahedra, and edges with two equivalent ZrO7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 53–67°. There are a spread of Sm–O bond distances ranging from 2.27–2.52 Å. In the second Sm3+ site, Sm3+ is bonded in a distorted body-centered cubic geometry to eight O2- atoms. There are a spread of Sm–O bond distances ranging from 2.39–2.90 Å. In the third Sm3+ site, Sm3+ is bonded in a distorted body-centered cubic geometry to eight O2- atoms. There are a spread of Sm–O bond distances ranging from 2.24–2.63 Å. In the fourth Sm3+ site, Sm3+ is bonded to six O2- atoms to form distorted SmO6 octahedra that share corners with four equivalent ZrO6 octahedra, corners with two equivalent ZrO7 pentagonal bipyramids, and edges with two equivalent ZrO6 octahedra. The corner-sharing octahedral tilt angles are 67°. There are two shorter (2.35 Å) and four longer (2.43 Å) Sm–O bond lengths. In the fifth Sm3+ site, Sm3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Sm–O bond distances ranging from 2.32–2.62 Å. In the sixth Sm3+ site, Sm3+ is bonded in a distorted body-centered cubic geometry to eight O2- atoms. There are a spread of Sm–O bond distances ranging from 2.31–2.62 Å. In the seventh Sm3+ site, Sm3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Sm–O bond distances ranging from 2.31–2.59 Å. There are eight inequivalent Zr4+ sites. In the first Zr4+ site, Zr4+ is bonded to six O2- atoms to form ZrO6 octahedra that share corners with five ZrO6 octahedra, a cornercorner with one SmO7 pentagonal bipyramid, and an edgeedge with one ZrO7 pentagonal bipyramid. The corner-sharing octahedra tilt angles range from 51–54°. There are a spread of Zr–O bond distances ranging from 2.08–2.15 Å. In the second Zr4+ site, Zr4+ is bonded to six O2- atoms to form ZrO6 octahedra that share corners with five ZrO6 octahedra and a cornercorner with one SmO7 pentagonal bipyramid. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Zr–O bond distances ranging from 2.10–2.16 Å. In the third Zr4+ site, Zr4+ is bonded to six O2- atoms to form ZrO6 octahedra that share corners with two equivalent SmO6 octahedra, corners with four ZrO6 octahedra, corners with two equivalent ZrO7 pentagonal bipyramids, and edges with two equivalent SmO7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 43–67°. There are two shorter (2.03 Å) and four longer (2.13 Å) Zr–O bond lengths. In the fourth Zr4+ site, Zr4+ is bonded to seven O2- atoms to form distorted ZrO7 pentagonal bipyramids that share a cornercorner with one SmO6 octahedra, corners with two equivalent ZrO6 octahedra, edges with two equivalent ZrO6 octahedra, and edges with two equivalent SmO7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 39–57°. There are a spread of Zr–O bond distances ranging from 2.07–2.42 Å. In the fifth Zr4+ site, Zr4+ is bonded to six O2- atoms to form distorted ZrO6 octahedra that share corners with four equivalent ZrO6 octahedra, corners with two equivalent SmO7 pentagonal bipyramids, and edges with two equivalent SmO6 octahedra. The corner-sharing octahedral tilt angles are 56°. There are two shorter (2.08 Å) and four longer (2.19 Å) Zr–O bond lengths. In the sixth Zr4+ site, Zr4+ is bonded to six O2- atoms to form corner-sharing ZrO6 octahedra. The corner-sharing octahedra tilt angles range from 52–53°. There are a spread of Zr–O bond distances ranging from 2.11–2.13 Å. In the seventh Zr4+ site, Zr4+ is bonded to six O2- atoms to form corner-sharing ZrO6 octahedra. The corner-sharing octahedra tilt angles range from 52–53°. There are two shorter (2.11 Å) and four longer (2.12 Å) Zr–O bond lengths. In the eighth Zr4+ site, Zr4+ is bonded to six O2- atoms to form corner-sharing ZrO6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are two shorter (2.11 Å) and four longer (2.12 Å) Zr–O bond lengths. There are twenty inequivalent O2- sites. In the first O2- site, O2- is bonded to two Sm3+ and two Zr4+ atoms to form distorted OSm2Zr2 tetrahedra that share corners with six OSm2Zr2 tetrahedra and edges with four OSmZr3 tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Sm3+ and two equivalent Zr4+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two Sm3+ and two Zr4+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Sm3+ and two Zr4+ atoms. In the fifth O2- site, O2- is bonded to three Sm3+ and one Zr4+ atom to form OSm3Zr tetrahedra that share corners with nine OSm2Zr2 tetrahedra and edges with three OSm3Zr tetrahedra. In the sixth O2- site, O2- is bonded to one Sm3+ and three Zr4+ atoms to form distorted OSmZr3 tetrahedra that share corners with six OSm4 tetrahedra and edges with three OSm2Zr2 tetrahedra. In the seventh O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Sm3+ and two equivalent Zr4+ atoms. In the eighth O2- site, O2- is bonded to two Sm3+ and two Zr4+ atoms to form distorted OSm2Zr2 tetrahedra that share corners with seven OSmZr3 tetrahedra and edges with three OSm2Zr2 tetrahedra. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to two Sm3+ and two Zr4+ atoms. In the tenth O2- site, O2- is bonded to three Sm3+ and one Zr4+ atom to form OSm3Zr tetrahedra that share corners with ten OSm2Zr2 tetrahedra and edges with four OSm3Zr tetrahedra. In the eleventh O2- site, O2- is bonded to three Sm3+ and one Zr4+ atom to form OSm3Zr tetrahedra that share corners with eight OSm3Zr tetrahedra and edges with three OSm2Zr2 tetrahedra. In the twelfth O2- site, O2- is bonded in a 4-coordinate geometry to two Sm3+ and two Zr4+ atoms. In the thirteenth O2- site, O2- is bonded to three Sm3+ and one Zr4+ atom to form OSm3Zr tetrahedra that share corners with nine OSmZr3 tetrahedra and edges with three OSm2Zr2 tetrahedra. In the fourteenth O2- site, O2- is bonded to two Sm3+ and two Zr4+ atoms to form a mixture of distorted edge and corner-sharing OSm2Zr2 tetrahedra. In the fifteenth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Sm3+ and two Zr4+ atoms. In the sixteenth O2- site, O2- is bonded to two Sm3+ and two equivalent Zr4+ atoms to form a mixture of distorted edge and corner-sharing OSm2Zr2 tetrahedra. In the seventeenth O2- site, O2- is bonded to two Sm3+ and two Zr4+ atoms to form a mixture of distorted edge and corner-sharing OSm2Zr2 tetrahedra. In the eighteenth O2- site, O2- is bonded to four Sm3+ atoms to form a mixture of edge and corner-sharing OSm4 tetrahedra. In the nineteenth O2- site, O2- is bonded to two equivalent Sm3+ and two Zr4+ atoms to form a mixture of distorted edge and corner-sharing OSm2Zr2 tetrahedra. In the twentieth O2- site, O2- is bonded to four Sm3+ atoms to form a mixture of edge and corner-sharing OSm4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr2Cu by Materials Project

Zr2Cu crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. there are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 2-coordinate geometry to four equivalent Cu atoms. There are two shorter (2.90 Å) and two longer (3.20 Å) Zr–Cu bond lengths. In the second Zr site, Zr is bonded in a 6-coordinate geometry to six equivalent Cu atoms. All Zr–Cu bond lengths are 2.67 Å. Cu is bonded in a 12-coordinate geometry to nine Zr and three equivalent Cu atoms. All Cu–Cu bond lengths are 2.92 Å.

36 MATERIALS SCIENCE↗