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At least 523 records · Page 29
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on AgAsS2 by Materials Project

AgAsS2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are four inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded in a distorted octahedral geometry to six S2- atoms. There are a spread of Ag–S bond distances ranging from 2.65–3.14 Å. In the second Ag1+ site, Ag1+ is bonded in a 6-coordinate geometry to six S2- atoms. There are a spread of Ag–S bond distances ranging from 2.60–3.23 Å. In the third Ag1+ site, Ag1+ is bonded in a 6-coordinate geometry to six S2- atoms. There are a spread of Ag–S bond distances ranging from 2.55–3.40 Å. In the fourth Ag1+ site, Ag1+ is bonded in a 6-coordinate geometry to six S2- atoms. There are a spread of Ag–S bond distances ranging from 2.55–3.57 Å. There are three inequivalent As3+ sites. In the first As3+ site, As3+ is bonded in a distorted T-shaped geometry to three S2- atoms. There are a spread of As–S bond distances ranging from 2.28–2.35 Å. In the second As3+ site, As3+ is bonded in a 5-coordinate geometry to three S2- atoms. There are a spread of As–S bond distances ranging from 2.26–2.40 Å. In the third As3+ site, As3+ is bonded in a distorted T-shaped geometry to three S2- atoms. There are one shorter (2.28 Å) and two longer (2.33 Å) As–S bond lengths. There are six inequivalent S2- sites. In the first S2- site, S2- is bonded in a trigonal non-coplanar geometry to two Ag1+ and one As3+ atom. In the second S2- site, S2- is bonded in a 5-coordinate geometry to three Ag1+ and two As3+ atoms. In the third S2- site, S2- is bonded in a 3-coordinate geometry to three Ag1+ and two As3+ atoms. In the fourth S2- site, S2- is bonded to three Ag1+ and one As3+ atom to form distorted corner-sharing SAg3As tetrahedra. In the fifth S2- site, S2- is bonded in a 5-coordinate geometry to four Ag1+ and one As3+ atom. In the sixth S2- site, S2- is bonded in a 3-coordinate geometry to three Ag1+ and two As3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2024

Real-Time KMC Simulation of Vacancy-Mediated Intermixing in Au@Ag Octahedral Core–Cubic Shell Nanocrystals with Ab Initio-Guided Kinetics

Utilization of core–shell rather than monometallic nanocrystals (NCs) facilitates fine-tuning of NC properties for applications. However, compositional evolution via intermixing can degrade these properties prompting recent experimental studies. We develop an atomistic-level stochastic model for vacancy-mediated intermixing exploiting a formalism which allows incorporation at an ab initio density functional theory level of not just the thermodynamics of vacancy formation, but also relevant diffusion barriers for a vast number of possible local environments (in the core and in the shell, at the interface, and in the intermixed phase). This facilitates a predictive treatment and comprehensive understanding of intermixing on the relevant time scale (e.g., 10 1 –10 3 s). In contrast, previous modeling at the atomistic level utilized only unrealistic generic prescriptions of barriers or employed simplified continuum treatments. For Au@Ag octahedral core–cubic shell NCs, our modeling not only captures the experimentally observed rate or time scale for intermixing of ~100 s at 450 °C for 60 nm NCs, but also elucidates the underlying rate controlling processes and the effective intermixing barrier.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
NASA NTRS1973

Abundance of 17 trace elements in carbonaceous chondrites.

Seventeen trace elements (Ag, Au, Bi, Br, Cd, Cs, Ge, In, Ir, Rb, Re, Sb, Se, Te, Tl, U, and Zn) were measured by neutron activation analysis in eight C1 samples (1 Alais, 3 Ivuna, 4 Orgueil and in three C2 samples (one each of Mighei, Murchison, Murray). The results show far less scatter than earlier literature data. The standard deviation of a single measurement from the mean of eight C1 samples lies between 2 and 14%, except for the following four elements: Au, Ag, Rb, and Br. The first two probably reflect contamination and sample heterogeneity, the last two, analytical error. Apparently C1 chondrites have a far more uniform composition than some authors have claimed.

Kraehenbuehl, U.↗
DOE OSTI2020

Materials Data on Ag2(MoO4)3 by Materials Project

Ag2(MoO4)3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Mo6+ sites. In the first Mo6+ site, Mo6+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Mo–O bond distances ranging from 1.75–2.23 Å. In the second Mo6+ site, Mo6+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Mo–O bond distances ranging from 1.72–2.34 Å. There are two inequivalent Ag3+ sites. In the first Ag3+ site, Ag3+ is bonded to six O2- atoms to form AgO6 octahedra that share edges with two equivalent AgO6 octahedra and edges with two equivalent AgO5 square pyramids. There are a spread of Ag–O bond distances ranging from 2.29–2.56 Å. In the second Ag3+ site, Ag3+ is bonded to five O2- atoms to form edge-sharing AgO5 square pyramids. There are a spread of Ag–O bond distances ranging from 2.33–2.53 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Ag3+ and one O2- atom. The O–O bond length is 1.24 Å. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Mo6+ and two Ag3+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to three Mo6+ atoms. In the fourth O2- site, O2- is bonded in a single-bond geometry to one O2- atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one Mo6+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Mo6+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to three Mo6+ atoms. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to one Mo6+ and three Ag3+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one Mo6+ and one Ag3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Uncovering the Effects of Metal Contacts on Monolayer MoS 2

Metal contacts are a key limiter to the electronic performance of two-dimensional (2D) semiconductor devices. In this work, we present a comprehensive study of contact interfaces between seven metals (Y, Sc, Ag, Al, Ti, Au, Ni, with work functions from 3.1 to 5.2 eV) and monolayer MoS 2 grown by chemical vapor deposition. We evaporate thin metal films onto MoS 2 and study the interfaces by Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, and electrical characterization. We uncover that (1) ultrathin oxidized Al dopes MoS 2 n-type (>2 × 1012 cm –2 ) without degrading its mobility, (2) Ag, Au, and Ni deposition causes varying levels of damage to MoS 2 (e.g. broadening Raman E' peak from <3 to >6 cm –1 ), and (3) Ti, Sc, and Y react with MoS 2 . Reactive metals must be avoided in contacts to monolayer MoS 2 , but control studies reveal the reaction is mostly limited to the top layer of multilayer films. Finally, we find that (4) thin metals do not significantly strain MoS 2 , as confirmed by X-ray diffraction. These are important findings for metal contacts to MoS 2 and broadly applicable to many other 2D semiconductors.

2D materials↗
DOE OSTI2021

Structural and physical properties of 99 complex bulk chalcogenides crystals using first-principles calculations

Chalcogenide semiconductors and glasses have many applications in the civil and military fields, especially in relation to their electronic, optical and mechanical properties for energy conversion and in enviormental materials. However, they are much less systemically studied and their fundamental physical properties for a large class chalcogenide semiconductors are rather scattered and incomplete. Here, we present a detailed study using well defined first-principles calculations on the electronic structure, interatomic bonding, optical, and mechanical properties for 99 bulk chalcogenides including thirteen of these crytals which have never been calculated. Due to their unique composition and structures, these 99 bulk chalcogenides are divided into two main groups. The first group contains 54 quaternary crystals with the structure composition (A2BCQ4) (A = Ag, Cu; B = Zn, Cd, Hg, Mg, Sr, Ba; C = Si, Ge, Sn; Q = S, Se, Te), while the second group contains scattered ternary and quaternary chalcogenide crystals with a more diverse composition (AxByCzQn) (A = Ag, Cu, Ba, Cs, Li, Tl, K, Lu, Sr; B = Zn, Cd, Hg, Al, Ga, In, P, As, La, Lu, Pb, Cu, Ag; C = Si, Ge, Sn, As, Sb, Bi, Zr, Hf, Ga, In; Q = S, Se, Te; x=1, 2, 3; y=0, 1, 2, 5; z=0, 1, 2 and n=3, 4, 5, 6, 9). Moreover, the total bond order density (TBOD) is used as a single quantum mechanical metric to characterize the internal cohesion of these crystals enabling us to correlate them with the calculated properties, especially their mechanical properties. This work provides a very large database for bulk chalcogenides crucial for the future theoretical and experimental studies, opening opportunities for study the properties and potential application of a wide variety of chalcogenides.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2025

Structure of Odd-A Ag Isotopes Studied via Algebraic Approaches

The structure of the odd-A silver isotopes Ag 103–115 is discussed within the frame of the interacting boson–fermion model (IBFM). An overview of their key properties is presented, with a particular attention paid to the “ J -1 anomaly”, represented by an abnormal ordering of the lowest 7/2 + and 9/2 + states. By examining previously published data and newly performed calculations, it is demonstrated that the experimentally known level schemes and electromagnetic properties of Ag 103–115 can be reproduced well within IBFM-1 by using a consistent set of model parameters. The contribution of different single-particle orbitals to the structure of the lowest-lying excited nuclear states in Ag 103–115 is discussed. Given that the J-1 anomaly brings down the 7/2 + level from the j −3 multiplet to energies, which can be thermally populated in hot stellar environments, the importance of low-lying excited states in odd-A silver isotopes for astrophysical processes is outlined.

IBFM-1↗
NASA NTRS2002

Time-Temperature-Precipitation Behavior in Al-Li Alloy 2195

Transmission electron microscopy was used to study time-temperature-precipitation (TTP) behavior in aluminum-lithium (Al-Li) 2195 alloy. Al-Li 2195 (nominally Al + 4 percent Cu + 1 percent Li + 0.3 percent Ag + 0.3 percent Mg + 0.1 percent Zr) was initially solutionized for 1 hr at 950 F and then stretched 3 percent. Heat treatments were conducted for up to 100 hr at temperatures ranging from 200 to 1,000 F. TTP diagrams were determined for both matrix and subgrain boundaries. Depending upon heat treatment conditions, precipitate phases (such as GP zone, theta'', theta', theta, delta', T1, TB, and T2) were found in the alloy. The TTP diagrams were applied as a guide to avoid T1 precipitation at subgrain boundaries, as part of an effort to improve the alloy's cryogenic fracture toughness (CFT). New understanding of TTP behavior was instrumental in the development of a two-step artificial aging treatment that significantly enhanced CFT in Al-Li 2195.

Chen, P. S.↗
DOE OSTI2020

Materials Data on AgH14C3S3N6ClO by Materials Project

(AgC3H12(N2S)3)2(H2O)2Cl2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two hydrochloric acid molecules, two water molecules, and one AgC3H12(N2S)3 cluster. In the AgC3H12(N2S)3 cluster, Ag1+ is bonded to four S2- atoms to form edge-sharing AgS4 tetrahedra. There are a spread of Ag–S bond distances ranging from 2.52–3.00 Å. There are three inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a distorted trigonal planar geometry to two N3- and one S2- atom. There is one shorter (1.33 Å) and one longer (1.34 Å) C–N bond length. The C–S bond length is 1.74 Å. In the second C4+ site, C4+ is bonded in a distorted trigonal planar geometry to two N3- and one S2- atom. Both C–N bond lengths are 1.34 Å. The C–S bond length is 1.72 Å. In the third C4+ site, C4+ is bonded in a distorted trigonal planar geometry to two N3- and one S2- atom. Both C–N bond lengths are 1.34 Å. The C–S bond length is 1.72 Å. There are six inequivalent N3- sites. In the first N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. In the second N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. In the third N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. In the fourth N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.02 Å. In the fifth N3- site, N3- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. Both N–H bond lengths are 1.02 Å. In the sixth N3- site, N3- 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 twelve inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the tenth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the eleventh H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the twelfth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Ag1+ and one C4+ atom. In the second S2- site, S2- is bonded in a water-like geometry to one Ag1+ and one C4+ atom. In the third S2- site, S2- is bonded in a water-like geometry to one Ag1+ and one C4+ atom.

36 MATERIALS SCIENCE↗
NASA NTRS2016

Human Health Countermeasures - Partial-Gravity Analogs Workshop

The experimental conditions that were deemed the most interesting by the HHC Element lead scientists are those permitting studies of the long-term effects of exposure to (a) chronic rotation when supine or in head down tilt (ground-based); and (b) long-radius centrifugation (space based). It is interesting to note that chronic ground based slow rotation room studies have not been performed since the 1960's, when the USA and USSR were investigating the potential use of AG for long-duration space missions. On the other hand, the other partial gravity analogs, i.e., parabolic flight, HUT, suspension, and short-radius centrifugation, have been regularly used in the last three decades (see review in Clément et al. 2015). Based on the workshop evaluations and the scores by the HHC scientific disciplines indicated in tables 3 and 4, simulation of partial G between 0 and 1 should be prioritized as follows: Priority 1. Chronic space-based partial-G analogs: a. Chronic space-based long-radius centrifugation. The ideal scenario would be chronic long-radius centrifugation of cells, animals and humans in a translational research approach - ideally beyond low earth orbit under deep space environmental effects and at various rotations - to obtain different G-effects. In this scenario, all physiological systems could be evaluated and the relationship between physiological response and G level established. This would be the most integrative way of defining, for the first time ever, G-thresholds for each physiological system. b. Chronic space-based centrifugation of animals. Chronic centrifugation of rodents at various G levels in space would allow for determination of AG thresholds of protection for each physiological system. In this case, all physiological systems will be of interest. Intermittent centrifugation will be of secondary interest. c. Chronic space-based centrifugation of cell cultures (RWV). Bioreactor studies of cells and cell cultures of various tissues at various G levels would allow for intracellular investigations of the effects of partial-G. Priority 2. Acute, intermittent space based partial-G analogs: a. Acute, intermittent space-based short radius human centrifugation. Intermittent centrifugation of humans would allow determination of thresholds of AG for protection of astronaut health in space. Priority 3. Chronic ground-based partial-G analogs: a. Chronic centrifugation of supine or head-down tilted humans. b. Chronic head-up tilt in humans. c. Chronic head-out graded dry immersion in humans. d. Chronic partial suspension of rodents e. Chronic rotating bioreactor cell culture studies (RWV) Priority 4. Acute ground based partial-G analogs. a. Parabolic flights. Very acute and short term effects of G levels between 0 and 1 in humans for fast responding systems like cardiovascular and sensorimotor as well as for acute responses in cell cultures and animals. b. Other acute models as indicated in table 3.

Barr, Yael↗
DOE OSTI2020

Materials Data on Ti2Ag2P2S11 by Materials Project

Ti2Ag2P2S11 crystallizes in the orthorhombic Pnma space group. The structure is two-dimensional and consists of two Ti2Ag2P2S11 sheets oriented in the (0, 0, 1) direction. Ti4+ is bonded to seven S2- atoms to form distorted TiS7 pentagonal bipyramids that share an edgeedge with one TiS7 pentagonal bipyramid, edges with two PS4 tetrahedra, and a faceface with one TiS7 pentagonal bipyramid. There are a spread of Ti–S bond distances ranging from 2.32–2.65 Å. There are two inequivalent Ag2+ sites. In the first Ag2+ site, Ag2+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Ag–S bond distances ranging from 2.59–2.87 Å. In the second Ag2+ site, Ag2+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Ag–S bond distances ranging from 2.62–2.77 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four S2- atoms to form PS4 tetrahedra that share edges with two equivalent TiS7 pentagonal bipyramids. There are a spread of P–S bond distances ranging from 2.02–2.09 Å. In the second P5+ site, P5+ is bonded to four S2- atoms to form PS4 tetrahedra that share edges with two equivalent TiS7 pentagonal bipyramids. There are a spread of P–S bond distances ranging from 2.03–2.09 Å. There are nine inequivalent S2- sites. In the first S2- site, S2- is bonded in a water-like geometry to two equivalent Ti4+ atoms. In the second S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Ag2+ and one P5+ atom. In the third S2- site, S2- is bonded in a 2-coordinate geometry to two equivalent Ti4+ and one S2- atom. The S–S bond length is 2.03 Å. In the fourth S2- site, S2- is bonded in a 2-coordinate geometry to two equivalent Ti4+ and one S2- atom. In the fifth S2- site, S2- is bonded in a 3-coordinate geometry to one Ti4+, one Ag2+, and one P5+ atom. In the sixth S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Ag2+ and one P5+ atom. In the seventh S2- site, S2- is bonded in a 3-coordinate geometry to one Ti4+, one Ag2+, and one P5+ atom. In the eighth S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Ti4+ and one P5+ atom. In the ninth S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Ti4+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnAgF5 by Materials Project

AgZnF5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ag3+ is bonded to six F1- atoms to form corner-sharing AgF6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are a spread of Ag–F bond distances ranging from 2.07–2.12 Å. Zn2+ is bonded in a 4-coordinate geometry to seven F1- atoms. There are a spread of Zn–F bond distances ranging from 1.89–2.68 Å. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a 2-coordinate geometry to one Ag3+ and two equivalent Zn2+ atoms. In the second F1- site, F1- is bonded in a 2-coordinate geometry to one Ag3+ and two equivalent Zn2+ atoms. In the third F1- site, F1- is bonded in a bent 150 degrees geometry to one Ag3+ and one Zn2+ atom. In the fourth F1- site, F1- is bonded in a linear geometry to one Ag3+ and one Zn2+ atom. In the fifth F1- site, F1- is bonded in a 3-coordinate geometry to two equivalent Ag3+ and one Zn2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UVAgO6 by Materials Project

UVAgO6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. U6+ is bonded to seven O2- atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent UO7 pentagonal bipyramids, corners with two equivalent VO5 trigonal bipyramids, an edgeedge with one UO7 pentagonal bipyramid, and edges with two equivalent VO5 trigonal bipyramids. There are a spread of U–O bond distances ranging from 1.83–2.43 Å. V5+ is bonded to five O2- atoms to form distorted VO5 trigonal bipyramids that share corners with two equivalent UO7 pentagonal bipyramids, edges with two equivalent UO7 pentagonal bipyramids, and an edgeedge with one VO5 trigonal bipyramid. There are a spread of V–O bond distances ranging from 1.65–1.97 Å. Ag1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ag–O bond distances ranging from 2.28–3.00 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one U6+ and one Ag1+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one U6+, two equivalent V5+, and one Ag1+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one V5+ and one Ag1+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one U6+ and two equivalent Ag1+ atoms. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent U6+, one V5+, and one Ag1+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent U6+ and one V5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2AgWO6 by Materials Project

Mg2WAgO6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Mg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Mg–O bond distances ranging from 2.06–2.43 Å. W6+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of W–O bond distances ranging from 1.92–1.99 Å. Ag2+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Ag–O bond distances ranging from 2.04–2.83 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Mg2+, one W6+, and one Ag2+ atom. In the second O2- site, O2- is bonded to two equivalent Mg2+, one W6+, and one Ag2+ atom to form a mixture of distorted edge and corner-sharing OMg2AgW tetrahedra. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Mg2+, one W6+, and one Ag2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on VAg(PS3)2 by Materials Project

AgVP2S6 crystallizes in the monoclinic P2/c space group. The structure is two-dimensional and consists of one AgVP2S6 sheet oriented in the (0, 0, 1) direction. V3+ is bonded to six S2- atoms to form VS6 octahedra that share an edgeedge with one AgS6 octahedra and edges with two equivalent VS6 octahedra. There are a spread of V–S bond distances ranging from 2.42–2.49 Å. Ag1+ is bonded to six S2- atoms to form distorted AgS6 octahedra that share an edgeedge with one VS6 octahedra and edges with two equivalent AgS6 octahedra. There are a spread of Ag–S bond distances ranging from 2.74–2.89 Å. P4+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are a spread of P–S bond distances ranging from 1.97–2.13 Å. There are three inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent V3+ and one P4+ atom. In the second S2- site, S2- is bonded in a 1-coordinate geometry to two equivalent Ag1+ and one P4+ atom. In the third S2- site, S2- is bonded in a 3-coordinate geometry to one V3+, one Ag1+, and one P4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeAg(WO4)2 by Materials Project

AgCe(WO4)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ce3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ce–O bond distances ranging from 2.42–2.70 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded to six O2- atoms to form distorted edge-sharing WO6 octahedra. There are a spread of W–O bond distances ranging from 1.83–2.13 Å. In the second W6+ site, W6+ is bonded to six O2- atoms to form distorted edge-sharing WO6 octahedra. There are a spread of W–O bond distances ranging from 1.81–2.21 Å. Ag1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ag–O bond distances ranging from 2.36–3.04 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Ce3+, two W6+, and one Ag1+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Ce3+, one W6+, and one Ag1+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ce3+, one W6+, and one Ag1+ atom. In the fourth O2- site, O2- is bonded to three W6+ and one Ag1+ atom to form distorted edge-sharing OAgW3 tetrahedra. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ce3+, one W6+, and one Ag1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NbAg2(PS4)2 by Materials Project

NbAg2(PS4)2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Nb4+ is bonded to eight S2- atoms to form distorted face-sharing NbS8 hexagonal bipyramids. There are a spread of Nb–S bond distances ranging from 2.50–2.72 Å. There are two inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded in a 5-coordinate geometry to five S2- atoms. There are a spread of Ag–S bond distances ranging from 2.64–3.13 Å. In the second Ag1+ site, Ag1+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Ag–S bond distances ranging from 2.52–3.22 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are a spread of P–S bond distances ranging from 2.03–2.07 Å. In the second P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are a spread of P–S bond distances ranging from 2.02–2.08 Å. There are ten inequivalent S2- sites. In the first S2- site, S2- is bonded in an L-shaped geometry to one Nb4+ and one P5+ atom. In the second S2- site, S2- is bonded to three Ag1+ and one P5+ atom to form distorted corner-sharing SAg3P tetrahedra. In the third S2- site, S2- is bonded in an L-shaped geometry to one Nb4+ and one P5+ atom. In the fourth S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Nb4+ and one S2- atom. The S–S bond length is 2.02 Å. In the fifth S2- site, S2- is bonded in a 5-coordinate geometry to four Ag1+ and one P5+ atom. In the sixth S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Nb4+ and one S2- atom. In the seventh S2- site, S2- is bonded in a 3-coordinate geometry to one Nb4+, one Ag1+, and one P5+ atom. In the eighth S2- site, S2- is bonded in a 3-coordinate geometry to one Nb4+, one Ag1+, and one P5+ atom. In the ninth S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Nb4+ and one S2- atom. The S–S bond length is 2.02 Å. In the tenth S2- site, S2- is bonded in a 3-coordinate geometry to two equivalent Nb4+ and one S2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AgBi(PSe3)2 by Materials Project

AgBiP2Se6 crystallizes in the trigonal R-3 space group. The structure is two-dimensional and consists of six AgBiP2Se6 sheets oriented in the (0, 0, 1) direction. Ag1+ is bonded to six Se2- atoms to form distorted AgSe6 octahedra that share edges with three equivalent BiSe6 octahedra. There are three shorter (2.79 Å) and three longer (3.10 Å) Ag–Se bond lengths. Bi1+ is bonded to six Se2- atoms to form BiSe6 octahedra that share edges with three equivalent AgSe6 octahedra. There are three shorter (2.98 Å) and three longer (2.99 Å) Bi–Se bond lengths. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three equivalent Se2- atoms. All P–Se bond lengths are 2.22 Å. In the second P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three equivalent Se2- atoms. All P–Se bond lengths are 2.21 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to one Ag1+, one Bi1+, and one P5+ atom. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to one Ag1+, one Bi1+, and one P5+ atom.

36 MATERIALS SCIENCE↗