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At least 145 records · Page 8
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on As4N2Cl2O7 by Materials Project

N2As4O7Cl2 crystallizes in the hexagonal P6/mmm space group. The structure is two-dimensional and consists of two hydrochloric acid molecules; one As4O7 sheet oriented in the (0, 0, 1) direction; and one N2 sheet oriented in the (0, 0, 1) direction. In the As4O7 sheet, As5+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All As–O bond lengths are 1.81 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent As5+ and two equivalent O2- atoms. Both O–O bond lengths are 3.12 Å. In the second O2- site, O2- is bonded to twelve equivalent O2- atoms to form edge-sharing OO12 cuboctahedra. In the N2 sheet, N2- is bonded in a distorted trigonal planar geometry to three equivalent N2- atoms. All N–N bond lengths are 3.08 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li6FeN4 by Materials Project

Li6FeN4 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four equivalent N2- atoms to form distorted LiN4 tetrahedra that share corners with four equivalent FeN4 tetrahedra, corners with eight equivalent LiN4 tetrahedra, and edges with six LiN4 tetrahedra. There are two shorter (1.99 Å) and two longer (2.25 Å) Li–N bond lengths. In the second Li1+ site, Li1+ is bonded to four equivalent N2- atoms to form distorted LiN4 tetrahedra that share corners with two equivalent FeN4 tetrahedra, corners with twelve LiN4 tetrahedra, an edgeedge with one FeN4 tetrahedra, and edges with four LiN4 tetrahedra. All Li–N bond lengths are 2.08 Å. Fe2+ is bonded to four equivalent N2- atoms to form FeN4 tetrahedra that share corners with sixteen LiN4 tetrahedra and edges with four equivalent LiN4 tetrahedra. All Fe–N bond lengths are 1.77 Å. N2- is bonded in a 7-coordinate geometry to six Li1+ and one Fe2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on P2N3O8 by Materials Project

(N2)2(PO3N)2(PO2)2(O2)3 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four 6303-21-5 molecules, eight ammonia molecules, four trioxidane molecules, and four PO3N clusters. In each PO3N cluster, P5+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.51 Å) and one longer (1.52 Å) P–O bond length. N2+ is bonded in a distorted bent 120 degrees geometry to two O2- atoms. There is one shorter (1.11 Å) and one longer (2.12 Å) N–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one P5+ and one N2+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one N2+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KHCS2N by Materials Project

KCNHS2 crystallizes in the orthorhombic Pbcn space group. The structure is three-dimensional. K1+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of K–S bond distances ranging from 3.21–3.64 Å. C4+ is bonded in a distorted trigonal planar geometry to one N2- and two S2- atoms. The C–N bond length is 1.36 Å. There is one shorter (1.69 Å) and one longer (1.73 Å) C–S bond length. N2- is bonded in a 3-coordinate geometry to one C4+, one N2-, and one H1+ atom. The N–N bond length is 1.38 Å. The N–H bond length is 1.03 Å. H1+ is bonded in a single-bond geometry to one N2- atom. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to three equivalent K1+ and one C4+ atom. In the second S2- site, S2- is bonded in a 5-coordinate geometry to four equivalent K1+ and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PbC3S2N(O2F)2 by Materials Project

(C)3PbNS2(O2F)2 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of six methane molecules and two PbNS2(O2F)2 ribbons oriented in the (1, 0, 0) direction. In each PbNS2(O2F)2 ribbon, Pb4+ is bonded in a linear geometry to one N2- and one O2- atom. The Pb–N bond length is 2.57 Å. The Pb–O bond length is 2.67 Å. N2- is bonded in a distorted bent 120 degrees geometry to one Pb4+ and two S2- atoms. There is one shorter (1.60 Å) and one longer (1.63 Å) N–S bond length. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to one N2-, two O2-, and one F1- atom to form corner-sharing SNO2F tetrahedra. Both S–O bond lengths are 1.43 Å. The S–F bond length is 1.60 Å. In the second S2- site, S2- is bonded to one N2-, two O2-, and one F1- atom to form corner-sharing SNO2F tetrahedra. There is one shorter (1.43 Å) and one longer (1.45 Å) S–O bond length. The S–F bond length is 1.60 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one S2- atom. In the second O2- site, O2- is bonded in a single-bond geometry to one S2- atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Pb4+ and one S2- atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one S2- atom. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one S2- atom. In the second F1- site, F1- is bonded in a single-bond geometry to one S2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PH4BrN4 by Materials Project

(H2)2PN4Br crystallizes in the tetragonal P4/nbm space group. The structure is one-dimensional and consists of eight hydrogen molecules and four PN4Br ribbons oriented in the (0, 0, 1) direction. In each PN4Br ribbon, P5+ is bonded in a distorted rectangular see-saw-like geometry to four equivalent N2- atoms. All P–N bond lengths are 1.67 Å. N2- is bonded in a 1-coordinate geometry to one P5+, one N2-, and one Br1- atom. The N–N bond length is 1.46 Å. The N–Br bond length is 3.30 Å. Br1- is bonded in a 4-coordinate geometry to four equivalent N2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

High-throughput and high-efficiency sample preparation for single-cell proteomics using a nested nanowell chip

Abstract Global quantification of protein abundances in single cells could provide direct information on cellular phenotypes and complement transcriptomics measurements. However, single-cell proteomics is still immature and confronts many technical challenges. Herein we describe a nested nanoPOTS (N2) chip to improve protein recovery, operation robustness, and processing throughput for isobaric-labeling-based scProteomics workflow. The N2 chip reduces reaction volume to <30 nL and increases capacity to >240 single cells on a single microchip. The tandem mass tag (TMT) pooling step is simplified by adding a microliter droplet on the nested nanowells to combine labeled single-cell samples. In the analysis of ~100 individual cells from three different cell lines, we demonstrate that the N2 chip-based scProteomics platform can robustly quantify ~1500 proteins and reveal membrane protein markers. Our analyses also reveal low protein abundance variations, suggesting the single-cell proteome profiles are highly stable for the cells cultured under identical conditions.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2024

Helium metastable density determination in the COST reference source by absolutely calibrated optical emission spectroscopy

Helium metastable densities in the COST Reference Microplasma Jet are estimated for a variety of He/N2 admixtures and dissipated powers by applying a collisional-radiative model to absolutely calibrated optical emission spectroscopy measurements. This is accomplished by delineating the excitation mechanisms that result in the N2(C–B) and N2+(B–X) emission bands, the latter of which is strongly coupled to the presence of helium metastables. A number of other plasma parameters are established and discussed for each operating condition including the electron energy distribution function, reduced electric field, rate constants, and electron density. With these parameters, the reaction rates for the primary ionization pathways are also calculated, emphasizing the importance of helium metastables for discharge sustainment. Good agreement with the existing literature is found for most plasma parameters and for helium metastable densities, in particular. A clear [N2]−1 relationship between the nitrogen concentration and density of helium metastables is demonstrated, as has been identified in previous studies in analogous atmospheric pressure plasma jets. This validates the efficacy of this optical technique for determining helium metastable densities and establishes it as a viable, and in many cases, more accessible alternative to other means of quantifying helium metastables in low-temperature plasmas.

Physics↗
DOE OSTI2023

Tomographic optical emission spectroscopy of an atmospheric pressure plasma jet and surface ionization waves on planar and structured surfaces

Here in this paper, an approach for 3D plasma structure diagnostics using tomographic optical emission spectroscopy (Tomo-OES) of a nanosecond pulsed atmospheric pressure plasma jet (APPJ) is presented. In contrast to the well-known Abel inversion, Tomo-OES does not require cylindrical symmetry to recover 3D distributions of plasma light emission. Instead, many 2D angular projections are measured with intensified cameras and the multiplicative algebraic reconstruction technique is used to recover the 3D distribution of light emission. This approach solves the line-of-sight integration problem inherent to optical diagnostics, allowing recovery of localized OES information within the plasma that can be used to better infer plasma parameters within complex plasma structures. Here, Tomo-OES was applied to investigate an APPJ operated with helium in ambient air and impinging on planar and structured dielectric surfaces. Surface charging caused the guided streamer from the APPJ to transition to a surface ionization wave (SIW) that propagated along the surface. The SIW experienced variable geometrical and electrical material properties as it propagated, leading to 3D configurations that were non-symmetric and spatially complex. Light emission from He, N$_2^+$, and N2 were imaged at ten angular projections and the respective time-resolved 3D emission distributions in the plasma were then reconstructed. The spatial resolution of each tomographic reconstruction was 7.4 µm and the temporal resolution was 5 ns, sufficient to observe the guided streamer and the effects of the structured surface on the SIW. Emission from He showed the core of the jet and emission from N$_2^+$ and N2 indicated effects of entrainment of ambient air. Penning ionization of N2 created a ring or outer layer of N$_2^+$ that spatially converged to form the 'plasma bullet' or spatially diverged across a surface as part of a SIW. The SIW entered trenches of size 150 µm, leading to decreases in plasma light emission in regions above the trenches. The plasma light emission was higher in some regions with trenches, possibly due to effects of field enhancement.

plasma interactions with complex surfaces↗
DOE OSTI2024

A synthetic co-culture for bioproduction of ammonia from methane and air

Abstract Fixed nitrogen fertilizers feed 50% of the global population, but most fixed nitrogen production occurs using energy-intensive Haber–Bosch-based chemistry combining nitrogen (N2) from air with gaseous hydrogen (H2) from methane (CH4) at high temperatures and pressures in large-scale facilities sensitive to supply chain disruptions. This work demonstrates the biological transformation of atmospheric N2 into ammonia (NH3) using CH4 as the sole carbon and energy source in a single vessel at ambient pressure and temperature, representing a biological “room-pressure and room-temperature” route to NH3 that could ultimately be developed to support compact, remote, NH3 production facilities amenable to distributed biomanufacturing. The synthetic microbial co-culture of engineered methanotroph Methylomicrobium buryatense (now Methylotuvimicrobium buryatense) and diazotroph Azotobacter vinelandii converted three CH4 molecules to l-lactate (C3H6O3) and powered gaseous N2 conversion to NH3. The design used division of labor and mutualistic metabolism strategies to address the oxygen sensitivity of nitrogenase and maximize CH4 oxidation efficiency. Media pH and salinity were central variables supporting co-cultivation. Carbon concentration heavily influenced NH3 production. Smaller-scale NH3 production near dispersed, abundant, and renewable CH4 sources could reduce disruption risks and capitalize on untapped energy resources. One-Sentence Summary Co-culture of engineered microorganisms Methylomicrobium buryatense and Azotobacter vinelandii facilitated the use of methane gas as a sole carbon feedstock to produce ammonia in an ambient temperature, atmospheric pressure, single-vessel system.

Biotechnology & Applied Microbiology↗
DOE OSTI2024

Origin of spin-driven ferroelectricity and effect of external pressure on the complex magnetism of the 6⁢ H perovskite Ba 3 ⁢Ho⁢Ru 2⁢ O 9

The compound Ba 3 HoRu 2 O 9 magnetically orders at 50 K (T N1 ), followed by another complex magnetic ordering at 10.2 K (T N2 ). The second magnetic phase transition was characterized by the coexistence of two competing magnetic ground states associated with two different magnetic wave vectors (K 1 = 0.5 0 0 and K 2 = 0.25 0.25 0). The multiferroicity and magnetoelectric coupling were predicted below T N2 in these 4d-based materials. Here, in this work, we have discussed the origin of spin-driven ferroelectricity, which is not known yet, and the nature of magnetoelectric domains. We have investigated the compound through time-of-flight neutron diffraction, synchrotron x-ray diffraction (XRD), ac susceptibility, frequency-dependent complex dielectric spectroscopy, and dc magnetization under external pressure. We have demonstrated that the noncollinear structure involving two different magnetic ions, Ru (4d) and Ho (4f), breaks the spatial inversion symmetry via inverse Dzyaloshinskii-Moriya (DM) interaction through strong 4d-4f magnetic correlation, which shifts the oxygen atoms and results in nonzero polarization. Such an observation of inverse DM interaction from two different magnetic ions which cause ferroelectricity is rarely observed. The stronger spin-orbit coupling of 4d orbital might play a major role in creating DM interaction of noncollinear spins. We have systematically studied the spin and dipolar dynamics, which exhibit intriguing behavior with shorter coherence lengths of second magnetic phase associated with the k 2 wave vector. The results manifest the development of finite-size magnetoelectric domains instead of true long-range ordering, which justifies the experimentally obtained low value of ferroelectric polarization. The lattice parameters and volume show a sharp anomaly at T N2 obtained by analyzing the temperature-dependence XRD, which is consistent with the ferroelectric transition, predicting a noncentrosymmetric space group, $P\bar{6}2c$, for this compound. Furthermore, we have investigated the effect of external pressure on this complex magnetism. The result reveals an enhancement of ordering temperature by the application of external pressure (~1.6 K/GPa). The external pressure might favor stabilizing the magnetic ground state associated with second magnetic phase. Our study shows an unconventional mechanism of spin-driven ferroelectricity involving inverse DM interaction between Ru (4d) and Ho (4f) magnetic ions due to strong 4d-4f cross coupling.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2020

A CRISPRi-dCas9 System for Archaea and Its Use To Examine Gene Function during Nitrogen Fixation by Methanosarcina acetivorans

CRISPR-based systems are emerging as the premier method to manipulate many cellular processes. In this study, a simple and efficient CRISPR interference (CRISPRi) system for targeted gene repression in archaea was developed. The Methanosarcina acetivorans CRISPR-Cas9 system was repurposed by replacing Cas9 with the catalytically dead Cas9 (dCas9) to generate a CRISPRi-dCas9 system for targeted gene repression. To test the utility of the system, genes involved in nitrogen (N2) fixation were targeted for dCas9-mediated repression. First, the nif operon (nifHI 1 I 2 DKEN) that encodes molybdenum nitrogenase was targeted by separate guide RNAs (gRNAs), one targeting the promoter and the other targeting nifD. Remarkably, growth of M. acetivorans with N 2 was abolished by dCas9-mediated repression of the nif operon with each gRNA. The abundance of nif transcripts was >90% reduced in both strains expressing the gRNAs, and NifD was not detected in cell lysate. Next, we targeted NifB, which is required for nitrogenase cofactor biogenesis. Expression of a gRNA targeting the coding sequence of NifB decreased nifB transcript abundance >85% and impaired but did not abolish growth of M. acetivorans with N2. Finally, to ascertain the ability to study gene regulation using CRISPRi-dCas9, nrpR1, encoding a subunit of the repressor of the nif operon, was targeted. The nrpR1 repression strain grew normally with N2 but had increased nif operon transcript abundance, consistent with NrpR1 acting as a repressor. Furthermore, these results highlight the utility of the system, whereby a single gRNA when expressed with dCas9 can block transcription of targeted genes and operons in M. acetivorans.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2022

Genetic and Antigenic Characterization of an Expanding H3 Influenza A Virus Clade in U.S. Swine Visualized by Nextstrain

Defining factors that influence spatial and temporal patterns of influenza A virus (IAV) is essential to inform vaccine strain selection and strategies to reduce the spread of potentially zoonotic swine-origin IAV. The relative frequency of detection of the H3 phylogenetic clade 1990.4.a (colloquially known as C-IVA) in U.S. swine declined to 7% in 2017 but increased to 32% in 2019. We conducted phylogenetic and phenotypic analyses to determine putative mechanisms associated with increased detection. We created an implementation of Nextstrain to visualize the emergence, spatial spread, and genetic evolution of H3 IAV in swine, identifying two C-IVA clades that emerged in 2017 and cocirculated in multiple U.S. states. Phylodynamic analysis of the hemagglutinin (HA) gene documented low relative genetic diversity from 2017 to 2019, suggesting clonal expansion. The major H3 C-IVA clade contained an N156H amino acid substitution, but hemagglutination inhibition (HI) assays demonstrated no significant antigenic drift. The minor HA clade was paired with the neuraminidase (NA) clade N2-2002B prior to 2016 but acquired and maintained an N2-2002A in 2016, resulting in a loss of antigenic cross-reactivity between N2-2002B- and -2002A-containing H3N2 strains. The major C-IVA clade viruses acquired a nucleoprotein (NP) of the H1N1pdm09 lineage through reassortment in the replacement of the North American swine-lineage NP. Instead of genetic or antigenic diversity within the C-IVA HA, our data suggest that population immunity to H3 2010.1 along with the antigenic diversity of the NA and the acquisition of the H1N1pdm09 NP gene likely explain the reemergence and transmission of C-IVA H3N2 in swine.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2025

Kinetic Model of Photochemical Nitrogen Reduction [SWR-25-97]

The code in this repository was used to model the kinetics of photochemical nitrogen reduction. Each directory represents a manuscript. The directory titled Dahl_CRPS_2025 contains the code used to fit the kinetic models presented in the manuscript titled, "Pre-steady-state kinetics of nanocrystal:molybdenum nitrogenase biohybrids reveals hole-scavenging efficiency is critical to achieving N2 reduction" by Peter J. Dahl, Lauren M. Pellows, Zhi-Yong Yang, Lance C. Seefeldt, John W. Peters, Gordana Dukovic, David W. Mulder, and Paul W. King. Molybdenum (Mo) nitrogenase is a two-component enzyme complex that catalyzes the reduction of dinitrogen to ammonia and protons to hydrogen gas. We have shown that electrons for dinitrogen reduction can be delivered photochemically to the catalytic MoFe protein component by CdS nanocrystals. In this study, we used electron paramagnetic resonance spectroscopy to measure the transient populations of catalytic intermediates. We fit the populations with a pre-steady-state kinetic model which allowed us to distinguish between productive and non-productive reaction pathways and extract the rate constants for the reaction. Our results demonstrated that the rate of catalytic electron delivery into MoFe protein increased with the concentration of sacrificial electron donor. This enabled electron delivery to exceed the rate of hydride protonation, a relaxation pathway which competes with N2 binding. Thus, managing the balance between electron transfer and hole transfer reactions is required to achieve a kinetic regime that favors N2 reduction.

Dahl, Peter [National Renewable Energy Laboratory ↗
DOE OSTI2020

Materials Data on IrN2 by Materials Project

IrN2 is Marcasite structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Ir4+ is bonded to six equivalent N2- atoms to form IrN6 octahedra that share corners with eight equivalent IrN6 octahedra, corners with six equivalent NIr3N tetrahedra, and edges with two equivalent IrN6 octahedra. The corner-sharing octahedral tilt angles are 67°. There are two shorter (2.08 Å) and four longer (2.11 Å) Ir–N bond lengths. N2- is bonded to three equivalent Ir4+ and one N2- atom to form distorted NIr3N tetrahedra that share corners with three equivalent IrN6 octahedra, corners with thirteen equivalent NIr3N tetrahedra, and an edgeedge with one NIr3N tetrahedra. The corner-sharing octahedra tilt angles range from 64–66°. The N–N bond length is 1.38 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RhN2 by Materials Project

RhN2 is Marcasite structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Rh4+ is bonded to six equivalent N2- atoms to form RhN6 octahedra that share corners with eight equivalent RhN6 octahedra, corners with six equivalent NRh3N tetrahedra, and edges with two equivalent RhN6 octahedra. The corner-sharing octahedral tilt angles are 69°. There are two shorter (2.10 Å) and four longer (2.14 Å) Rh–N bond lengths. N2- is bonded to three equivalent Rh4+ and one N2- atom to form NRh3N tetrahedra that share corners with three equivalent RhN6 octahedra, corners with thirteen equivalent NRh3N tetrahedra, and an edgeedge with one NRh3N tetrahedra. The corner-sharing octahedra tilt angles range from 64–65°. The N–N bond length is 1.30 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sb2N5F11 by Materials Project

(N2)5(Sb2F11)2 crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of eight N2 clusters and eight Sb2F11 clusters. In each N2 cluster, there are four inequivalent N+0.20+ sites. In the first N+0.20+ site, N+0.20+ is bonded in a bent 120 degrees geometry to two N+0.20+ atoms. Both N–N bond lengths are 1.28 Å. In the second N+0.20+ site, N+0.20+ is bonded in a single-bond geometry to one N+0.20+ atom. The N–N bond length is 1.13 Å. In the third N+0.20+ site, N+0.20+ is bonded in a distorted linear geometry to two N+0.20+ atoms. The N–N bond length is 1.13 Å. In the fourth N+0.20+ site, N+0.20+ is bonded in a distorted linear geometry to two N+0.20+ atoms. In each Sb2F11 cluster, there are two inequivalent Sb5+ sites. In the first Sb5+ site, Sb5+ is bonded to six F1- atoms to form corner-sharing SbF6 octahedra. The corner-sharing octahedral tilt angles are 26°. There are a spread of Sb–F bond distances ranging from 1.89–2.08 Å. In the second Sb5+ site, Sb5+ is bonded to six F1- atoms to form corner-sharing SbF6 octahedra. The corner-sharing octahedral tilt angles are 26°. There are a spread of Sb–F bond distances ranging from 1.89–2.06 Å. There are eleven inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the fifth F1- site, F1- is bonded in a bent 150 degrees geometry to two Sb5+ atoms. In the sixth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the seventh F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the eighth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the ninth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the tenth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom. In the eleventh F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on B3H7N by Materials Project

B3NH7 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four B3NH7 clusters. there are three inequivalent B1- sites. In the first B1- site, B1- is bonded to one N2- and three H+0.71+ atoms to form distorted BH3N tetrahedra that share a cornercorner with one BH4 tetrahedra and an edgeedge with one BH3N tetrahedra. The B–N bond length is 1.49 Å. There are a spread of B–H bond distances ranging from 1.20–1.38 Å. In the second B1- site, B1- is bonded to four H+0.71+ atoms to form corner-sharing BH4 tetrahedra. There are a spread of B–H bond distances ranging from 1.19–1.33 Å. In the third B1- site, B1- is bonded to one N2- and three H+0.71+ atoms to form distorted BH3N tetrahedra that share a cornercorner with one BH4 tetrahedra and an edgeedge with one BH3N tetrahedra. The B–N bond length is 1.48 Å. There are a spread of B–H bond distances ranging from 1.20–1.38 Å. N2- is bonded in a 2-coordinate geometry to two B1- atoms. There are seven inequivalent H+0.71+ sites. In the first H+0.71+ site, H+0.71+ is bonded in a water-like geometry to two B1- atoms. In the second H+0.71+ site, H+0.71+ is bonded in a single-bond geometry to one B1- atom. In the third H+0.71+ site, H+0.71+ is bonded in a distorted L-shaped geometry to two B1- atoms. In the fourth H+0.71+ site, H+0.71+ is bonded in a single-bond geometry to one B1- atom. In the fifth H+0.71+ site, H+0.71+ is bonded in a water-like geometry to two B1- atoms. In the sixth H+0.71+ site, H+0.71+ is bonded in a single-bond geometry to one B1- atom. In the seventh H+0.71+ site, H+0.71+ is bonded in a single-bond geometry to one B1- atom.

36 MATERIALS SCIENCE↗