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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CN2 by Materials Project

CN2 is Hittorf-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of two CN sheets oriented in the (0, 0, 1) direction and one N2 sheet oriented in the (0, 0, 1) direction. In each CN sheet, C4+ is bonded in a trigonal non-coplanar geometry to three equivalent N2- atoms. All C–N bond lengths are 1.46 Å. N2- is bonded in a trigonal non-coplanar geometry to three equivalent C4+ atoms. In the N2 sheet, N2- is bonded in a distorted trigonal non-coplanar geometry to three equivalent N2- atoms. All N–N bond lengths are 1.54 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrN2 by Materials Project

ZrN2 is Fluorite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Zr4+ is bonded in a body-centered cubic geometry to eight N2- atoms. All Zr–N bond lengths are 2.28 Å. There are two inequivalent N2- sites. In the first N2- site, N2- is bonded to four equivalent Zr4+ atoms to form a mixture of edge and corner-sharing NZr4 tetrahedra. In the second N2- site, N2- is bonded to four equivalent Zr4+ atoms to form a mixture of distorted edge and corner-sharing NZr4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UC3NO8 by Materials Project

UC3NO8 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two UC3NO8 sheets oriented in the (0, 1, 0) direction. U6+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of U–O bond distances ranging from 1.79–2.36 Å. There are three inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.27 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.22 Å) and one longer (1.31 Å) C–O bond length. In the third C4+ site, C4+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.17 Å) and one longer (1.18 Å) C–O bond length. N2- is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of N–O bond distances ranging from 2.91–3.28 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C4+ and one N2- atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one U6+, one C4+, and one N2- atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one C4+ and one N2- atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one U6+ and one C4+ atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to one U6+ and one N2- atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one U6+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one C4+ and one N2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CuC3N2O5 by Materials Project

NNCuCO(CO2)2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four carbon dioxide molecules and two NNCuCO clusters. In each NNCuCO cluster, Cu2+ is bonded in a distorted single-bond geometry to one O2- atom. The Cu–O bond length is 2.02 Å. C4+ is bonded in a 1-coordinate geometry to two N2- and one O2- atom. Both C–N bond lengths are 1.36 Å. The C–O bond length is 1.23 Å. There are two inequivalent N2- sites. In the first N2- site, N2- is bonded in a distorted single-bond geometry to one C4+ atom. In the second N2- site, N2- is bonded in a 1-coordinate geometry to one C4+ atom. O2- is bonded in a bent 120 degrees geometry to one Cu2+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on B6P2H14N2O19 by Materials Project

B6P2N2H14O19 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of one B6P2N2H14O19 ribbon oriented in the (1, 0, 0) direction. there are three inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with two equivalent PO4 tetrahedra. There is one shorter (1.44 Å) and three longer (1.49 Å) B–O bond length. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.37 Å) and one longer (1.40 Å) B–O bond length. In the third B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.35–1.41 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent BO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.49–1.65 Å. N2- is bonded in a tetrahedral geometry to four H1+ atoms. There are a spread of N–H bond distances ranging from 1.03–1.06 Å. There are seven inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- and one O2- atom. The H–O bond length is 1.67 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one B3+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted water-like geometry to one P5+ and one H1+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one B3+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one P5+, one H1+, and one O2- atom. The O–O bond length is 3.08 Å. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to two B3+ and one O2- atom. The O–O bond length is 3.02 Å. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two B3+ atoms. In the seventh O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one H1+ atom. In the eighth O2- site, O2- is bonded in a bent 120 degrees geometry to one B3+ and one H1+ atom. In the ninth O2- site, O2- is bonded in a bent 120 degrees geometry to two B3+ atoms. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to four O2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

INSIGHTS INTO MARINE UNICELLULAR CYANOBACTERIAL AND NON-CYANOBACTERIAL DIAZOTROPHS THROUGH SINGLE-CELL ANALYSES

Nutrient availability affects primary productivity, and nitrogen (N) is the limiting nutrient over large regions of the ocean. Biological N fixation (BNF) is the conversion of atmospheric dinitrogen (N2) to bioavailable forms of N (ammonium and amino acids). A select group of Bacteria and Archaea, known as diazotrophs, are the only organisms capable of this conversion. BNF is a critical source of N in nutrient-depleted (oligotrophic) marine waters. As such, BNF studies are a fundamental component for better understanding primary productivity and carbon cycling, as well as parameterizing predictive future global ocean models. Unicellular diazotrophs are widespread in marine systems and, in some cases, important contributors of BNF. This dissertation investigates unicellular diazotrophs at the single-cell level, including: UCYN-A, a cyanobacterial diazotroph that lives in symbiosis with an algal host, non-cyanobacterial diazotrophs (NCDs), which are putative heterotrophs, as well as a specific NCD known as Gamma A, a commonly occurring organism throughout the tropics and subtropics that belongs to the class Gammaproteobacteria. The single-cell investigations used in these studies can provide high-resolution insights that are not possible from community-level analyses of BNF, such as the N2 fixation rate of individual cells and cell morphology. Singlecell nanoscale secondary ion mass spectrometry (nanoSIMS) analyses were used in chapter 2 and 3 to investigate the cell-specific N2 fixation rates of (2) UCYN-A in the viii cold waters of the Bering and Arctic Seas where N2 fixation was not previously believed to be possible, and (3) NCDs in the North Pacific Subtropical Gyre where we demonstrated the first direct evidence of NCD N2 fixation on open ocean particles. Chapter 4 focused on the uncultivated NCD, Gamma A, using geneFISH to visualize single cells in natural seawater samples. We successfully identified Gamma A by developing a fluorescent in situ hybridization (FISH) probe targeting the diazotrophic functional marker gene nifH, revealing Gamma A cells are most often attached to particles. Together these studies provide new insights into the distributions, activities, and physiologies of geographically widespread, unicellular diazotrophs, thus improving our understanding of their roles as sources of fixed N in the surface ocean.

Harding, K.↗
DOE OSTI2025

Magnesium‐Mediated Electrochemical Synthesis of Ammonia

Metal-mediated electrochemical synthesis of ammonia (NH3) is a promising method to activate N2 at room temperature. While a Li-mediated approach has been optimized to produce NH3 at high current density and selectivity, Li's scarcity and its highly negative plating potential limit scalability and energy efficiency. Alternative mediators have been proposed, but only Ca has shown some promise, achieving ≈50% Faradaic efficiency (FE), though requiring voltages beyond -3 V. Here, we report a Mg-mediated nitrogen reduction reaction (Mg-NRR), where N2 is activated on Mg to form Mg3N2, followed by protolysis to release NH3 and regenerate Mg. A notable NH3 FE of 25.28 ± 3.80% is achieved at a current density of -45 mA cm-2, corresponding to an NH3 partial current density of -11.30 ± 1.77 mA cm-2 under 6 bar N2. Isotope-labeled experiments confirm that NH3 originates from N2, with similar FE (25.15 ± 1.01%). Importantly, NH3 production is demonstrated at a total cell potential as low as -3 V. This Li-free Mg-NRR system offers key advantages, including lower energy input and use of earth-abundant materials, making it a scalable route for sustainable NH3 synthesis.

Goyal, Ishita↗
DOE OSTI2022

Foam Fracturing Study for Stimulation Development of Enhanced Geothermal Systems

This is a final technical report for the project: Foam Fracturing Study for Stimulation Development of Enhanced Geothermal Systems (EGS). The goal is to demonstrate the feasibility of foam fracturing in EGS applications. The project, led by Oak Ridge National Laboratory (ORNL), was conducted in collaboration with Temple University. The report describes the research activities with Task 1 at ORNL: foam fracturing testing system development and experimental study on foam fracturing, and Task 2 at Temple University: foam testing and foam characterization. Main findings are: 1. A foam fracturing test system has been developed at ORNL, which can be used to perform foam fracturing under pressure up to 6,000 psi. The system monitors foam density during fracturing online and is capable of testing materials in both monotonic and cyclic (up to 50 Hz) injections. 2. Foam fracturing tests were carried out on Charcoal black granite specimens with a blind borehole to the middle length. Two diameters of blind borehole were tested; G2 series: 9.53 mm and G3 series: 4.76 mm. N2-in-water foam was used with AOS as a surfactant. 3. There was a hole-size effect on fracture initiation pressure. The effect is smaller in the case of foam, which was influenced by the high penetrability of gas in foam. Breakdown pressure showed a behavior just as that of fracture pressure; namely an increased value for small hole samples, while the effect in water fracture was more impressive than in foam fracture. 4. Water mass was reduced in foam fracturing within similar range of breakdown pressures. In G2 series, it was decreased from 10.44 g for water fracturing to 5.17 g, representing more than 50% water reduction. Therefore, there is the potential to reduce water use in EGS stimulation through foam fracturing. 5. Use of cyclic injection has the potential to reduce the breakdown pressure and seismicity in EGS application. Experiments using 4-s cycle period found that specimens can be fractured with a low number of cycles. The fatigue pressure was approximately 64 - 77% of monotonic breakdown pressure for water fracturing and 58 - 94% of the breakdown pressure for foam fracturing. 6. A foam stability testing system has been developed that can test foam at 220 Deg C to 2,000 psi. Tested components of candidate foams included two gases: N2 and CO2; 4 surfactants: AOS, SDS, NP-40 and CTAC; 5 stabilizing agents: guar, bentonite clay, borate salt, silica NPs, and GO. 7. N2 and AOS provided the most stable performance over the tested ranges. Furthermore, the AOS foam with stabilizing agents of guar and borate salt (crosslinker) offered the highest half-life of 20 minutes at 200 Deg C and 1,000 psi. 8. Arrhenius equation and modified power law have been demonstrated to fit well the half-time vs. temperature and pressure data, respectively. These relations can be useful to provide the suggestion for future foam stability study. This submission contains the supporting data developed during the project: 1) A final technical report 2) Granite fracturing data in monotonic and cyclic injections with water and N2 foam Foam performance data in various temperatures and pressures, including half-time, is submitted separately.

15 GEOTHERMAL ENERGY↗
DOE OSTI2022

Role of copper in nitrous oxide accumulation in wetland soils from Illinois and South Carolina and stream sediments from Tennessee

Denitrification is microbially-mediated through enzymes containing metal cofactors. Laboratory studies of pure cultures have highlighted that the availability of copper (Cu), required for the multicopper enzyme nitrous oxide reductase, can limit nitrous oxide (N2O) reduction. However, in natural aquatic systems, such as wetlands and hyporheic zones in stream beds, the role of Cu in controlling denitrification remains incompletely understood. In this study, we collected soils and sediments from three natural environments -- riparian wetlands, marsh wetlands, and a stream -- to investigate their nitrogen species transformation activity at background Cu levels and different supplemented Cu loadings. All of the systems contained solid-phase associated Cu below or around geological levels (40–280 nmol g-1) and exhibited low dissolved Cu (3–50 nM), which made them appropriate sites for evaluating the effect of limited Cu availability on denitrification.The dataset contains the variation in the nutrient (nitrate (NO3-), nitrite (NO2-), and ammonium (NH4+)) and N2O concentrations during the incubation experiments to evaluate the effect of Cu. We have also reported the variation in metal concentrations (Cu, iron(Fe) and manganese (Mn)) and dissolved organic carbon (DOC) concentrations during the incubations. The parameters obtained using a kinetic model to quantitatively report the effect of Cu on nitrogen species conversion in natural aquatic systems are also added in the dataset. The dataset also contains the labile concentration of Cu estimated using a speciation model in MINTEQ. All data are provided in text-based CSV format with header sections indicating the data contained in each file and the corresponding units.Our study suggests that high concentrations of N2O accumulated in all microcosms lacking Cu amendment except for one stream sediment sample. With Cu added to provide dissolved concentrations at trace levels (10–300 nM), the reduction rate of N2O to N2 in the wetland soils and stream sediments was enhanced. A kinetic model could account for the trends in nitrogen species by combining the reactions for microbial reduction of NO3- to NO2-/N2O/N2 and abiotic reduction of NO2 to nitrogen (N2_. The model revealed that the rate of N2O to N2 conversion increased significantly in the presence of Cu. For riparian wetland soils and stream sediments, the kinetic model also suggested that overall denitrification is driven by abiotic reduction of NO2- in the presence of inorganic electron donors. This study demonstrated that natural aquatic systems containing Cu at concentrations less than or equal to crustal abundances may display incomplete reduction of N2O to N2 that would cause N2O accumulation and release to the atmosphere.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2020

Materials Data on AlH15(NF)6 by Materials Project

AlNH3F6(NH2)3(NH3)2 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is zero-dimensional and consists of twelve ammonia molecules, eight ammonia molecules, and four AlNH3F6 clusters. In each AlNH3F6 cluster, Al3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Al–F bond distances ranging from 1.81–1.87 Å. N2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There is one shorter (1.04 Å) and two longer (1.05 Å) N–H bond length. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N2- and one F1- atom. The H–F bond length is 1.63 Å. There are six inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Al3+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Al3+ atom. In the third F1- site, F1- is bonded in a distorted water-like geometry to one Al3+ and one H1+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Al3+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one Al3+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one Al3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnH8(N2Cl)2 by Materials Project

ZnH8(N2Cl)2 crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of two ZnH8(N2Cl)2 clusters. Zn2+ is bonded in an octahedral geometry to four equivalent N2- and two equivalent Cl1- atoms. All Zn–N bond lengths are 2.20 Å. Both Zn–Cl bond lengths are 2.57 Å. N2- is bonded in a distorted water-like geometry to one Zn2+ and two H1+ atoms. Both N–H bond lengths are 1.03 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. Cl1- is bonded in a single-bond geometry to one Zn2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on InH5NOF4 by Materials Project

InNH5OF4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. In3+ is bonded to one O2- and six F1- atoms to form edge-sharing InOF6 pentagonal bipyramids. The In–O bond length is 2.18 Å. There are a spread of In–F bond distances ranging from 2.12–2.24 Å. N2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There is one shorter (1.05 Å) and two longer (1.06 Å) N–H bond length. There are five inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted linear geometry to one O2- and one F1- atom. The H–O bond length is 1.01 Å. The H–F bond length is 1.57 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- and one F1- atom. The H–O bond length is 1.00 Å. The H–F bond length is 1.63 Å. In the third H1+ site, H1+ is bonded in a distorted single-bond geometry to one N2- and one F1- atom. The H–F bond length is 1.62 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N2- and one F1- atom. The H–F bond length is 1.64 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. O2- is bonded in a distorted water-like geometry to one In3+ and two H1+ atoms. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted trigonal planar geometry to one In3+ and two H1+ atoms. In the second F1- site, F1- is bonded in a water-like geometry to two equivalent In3+ atoms. In the third F1- site, F1- is bonded in a distorted trigonal planar geometry to one In3+ and two H1+ atoms. In the fourth F1- site, F1- is bonded in a water-like geometry to two equivalent In3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnH8(N2Cl)2 by Materials Project

MnH8(N2Cl)2 crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of two MnH8(N2Cl)2 clusters. Mn2+ is bonded in an octahedral geometry to four equivalent N2- and two equivalent Cl1- atoms. All Mn–N bond lengths are 2.30 Å. Both Mn–Cl bond lengths are 2.57 Å. N2- is bonded in a distorted water-like geometry to one Mn2+ and two H1+ atoms. Both N–H bond lengths are 1.03 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. Cl1- is bonded in a single-bond geometry to one Mn2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on H6CN2O3 by Materials Project

CH6N2O3 crystallizes in the orthorhombic Pbcn space group. The structure is zero-dimensional and consists of four 927397-39-5 molecules. C4+ is bonded in a trigonal planar geometry to two equivalent N2- and one O2- atom. Both C–N bond lengths are 1.34 Å. The C–O bond length is 1.28 Å. N2- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.02 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the third H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.61 Å) H–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one H1+ atom. In the second O2- site, O2- is bonded in a trigonal planar geometry to one C4+ and two equivalent H1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PH5NO4 by Materials Project

NH4HPO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.51–1.59 Å. N2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There are a spread of N–H bond distances ranging from 1.05–1.07 Å. There are five inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.63 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.60 Å) H–O bond length. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N2- and one O2- atom. The H–O bond length is 1.74 Å. In the fourth H1+ site, H1+ is bonded in a distorted bent 150 degrees geometry to one N2- and one O2- atom. The H–O bond length is 1.61 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one P5+ and one H1+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one P5+ and one H1+ atom. In the third O2- site, O2- is bonded in a distorted tetrahedral geometry to one P5+ and three H1+ atoms. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one P5+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PH5N2O3 by Materials Project

NH2(NH)2P2NH6O6 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four ammonia molecules, two ammonia molecules, and one P2NH6O6 cluster. In the P2NH6O6 cluster, there are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.51–1.63 Å. In the second P5+ site, P5+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There is one shorter (1.64 Å) and two longer (1.65 Å) P–O bond length. N2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There are a spread of N–H bond distances ranging from 1.04–1.08 Å. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.02 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fourth H1+ site, H1+ is bonded in a distorted linear geometry to one N2- and one O2- atom. The H–O bond length is 1.59 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the sixth H1+ site, H1+ is bonded in a distorted single-bond geometry to one N2- and one O2- atom. The H–O bond length is 1.64 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one P5+ and one H1+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one P5+ and one H1+ atom. In the third O2- site, O2- is bonded in a water-like geometry to one P5+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two P5+ atoms. In the fifth O2- site, O2- is bonded in a water-like geometry to one P5+ and one H1+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to one P5+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AuI3N by Materials Project

AuNI3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Au5+ sites. In the first Au5+ site, Au5+ is bonded in a square co-planar geometry to four I1- atoms. There are two shorter (2.64 Å) and two longer (2.77 Å) Au–I bond lengths. In the second Au5+ site, Au5+ is bonded in a square co-planar geometry to four I1- atoms. There are two shorter (2.63 Å) and two longer (2.78 Å) Au–I bond lengths. N2- is bonded in a 7-coordinate geometry to seven I1- atoms. There are a spread of N–I bond distances ranging from 3.59–3.79 Å. There are three inequivalent I1- sites. In the first I1- site, I1- is bonded in a 1-coordinate geometry to one Au5+ and three equivalent N2- atoms. In the second I1- site, I1- is bonded in a 3-coordinate geometry to two Au5+ and one N2- atom. In the third I1- site, I1- is bonded in a 1-coordinate geometry to one Au5+ and three equivalent N2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SiH6(NF3)2 by Materials Project

SiH6(NF3)2 is Copper structured and crystallizes in the orthorhombic Pbca space group. The structure is zero-dimensional and consists of four SiH6(NF3)2 clusters. Si4+ is bonded in an octahedral geometry to six F1- atoms. There is two shorter (1.70 Å) and four longer (1.73 Å) Si–F bond length. N2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There are a spread of N–H bond distances ranging from 1.04–1.06 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- and one F1- atom. The H–F bond length is 1.63 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 120 degrees geometry to one Si4+ and one H1+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Si4+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Si4+ atom.

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