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At least 325 records · Page 18
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Electronic structure of mononuclear Cu-based molecule from density-functional theory with self-interaction correction

In this paper, we investigate the electronic structure of a planar mononuclear Cu-based molecule [Cu(C 6 H 4 S 2 ) 2 ] z in two oxidation states ( z = –2, –1) using density-functional theory (DFT) with Fermi–Löwdin orbital (FLO) self-interaction correction (SIC). The dianionic Cu-based molecule was proposed to be a promising qubit candidate. Self-interaction error within approximate DFT functionals renders severe delocalization of electron and spin densities arising from 3 d orbitals. The FLO-SIC method relies on optimization of Fermi–Löwdin orbital descriptors (FODs) with which localized occupied orbitals are constructed to create SIC potentials. Starting with many initial sets of FODs, we employ a frozen-density loop algorithm within the FLO-SIC method to study the Cu-based molecule. We find that the electronic structure of the molecule remains unchanged despite somewhat different final FOD configurations. In the dianionic state (spin S = 1/2), FLO-SIC spin density originates from the Cu d and S p orbitals with an approximate ratio of 2:1, in quantitative agreement with multireference calculations, while in the case of SIC-free DFT, the orbital ratio is reversed. Overall, FLO-SIC lowers the energies of the occupied orbitals and, in particular, the 3 d orbitals unhybridized with the ligands significantly, which substantially increases the energy gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) compared to SIC-free DFT results. The FLO-SIC HOMO–LUMO gap of the dianionic state is larger than that of the monoanionic state, which is consistent with experiment. Our results suggest a positive outlook of the FLO-SIC method in the description of magnetic exchange coupling within 3 d -element-based systems.

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

Materials Data on TiCuGe by Materials Project

TiCuGe crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Ti sites. In the first Ti site, Ti is bonded in a 4-coordinate geometry to six Cu and five Ge atoms. There are a spread of Ti–Cu bond distances ranging from 2.92–3.03 Å. There are a spread of Ti–Ge bond distances ranging from 2.58–2.81 Å. In the second Ti site, Ti is bonded in a 4-coordinate geometry to six Cu and five Ge atoms. There are four shorter (2.92 Å) and two longer (3.03 Å) Ti–Cu bond lengths. There are a spread of Ti–Ge bond distances ranging from 2.58–2.81 Å. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded to six Ti, two equivalent Cu, and four Ge atoms to form a mixture of distorted corner, edge, and face-sharing CuTi6Cu2Ge4 cuboctahedra. Both Cu–Cu bond lengths are 2.57 Å. All Cu–Ge bond lengths are 2.49 Å. In the second Cu site, Cu is bonded to six Ti, two equivalent Cu, and four Ge atoms to form a mixture of distorted corner, edge, and face-sharing CuTi6Cu2Ge4 cuboctahedra. There are two shorter (2.48 Å) and two longer (2.49 Å) Cu–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to five Ti and four Cu atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to five Ti and four Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe3(CuS5)2 by Materials Project

Fe3(CuS5)2 is pyrite-derived structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.22–2.31 Å. In the second Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.22–2.31 Å. In the third Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.26–2.33 Å. In the fourth Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.22–2.30 Å. In the fifth Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with four CuS6 octahedra and corners with eight FeS6 octahedra. The corner-sharing octahedra tilt angles range from 60–67°. There are a spread of Fe–S bond distances ranging from 2.26–2.34 Å. In the sixth Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 61–68°. There are a spread of Fe–S bond distances ranging from 2.22–2.31 Å. In the seventh Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.25–2.35 Å. In the eighth Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.25–2.35 Å. In the ninth Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with four CuS6 octahedra and corners with eight FeS6 octahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.26–2.33 Å. In the tenth Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with four FeS6 octahedra, corners with eight CuS6 octahedra, and corners with two SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are two shorter (2.25 Å) and four longer (2.28 Å) Fe–S bond lengths. In the eleventh Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with six FeS6 octahedra, corners with six CuS6 octahedra, and a cornercorner with one SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.26–2.33 Å. In the twelfth Fe3+ site, Fe3+ is bonded to six S+1.20- atoms to form FeS6 octahedra that share corners with four FeS6 octahedra, corners with eight CuS6 octahedra, and a cornercorner with one SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 60–68°. There are a spread of Fe–S bond distances ranging from 2.22–2.32 Å. There are eight inequivalent Cu+1.50+ sites. In the first Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with two equivalent CuS6 octahedra, corners with ten FeS6 octahedra, and a cornercorner with one SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 64–68°. There are a spread of Cu–S bond distances ranging from 2.38–2.47 Å. In the second Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with two equivalent CuS6 octahedra, corners with ten FeS6 octahedra, and corners with two SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 64–69°. There are a spread of Cu–S bond distances ranging from 2.39–2.48 Å. In the third Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with four equivalent CuS6 octahedra, corners with eight FeS6 octahedra, and corners with four SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 64–70°. There are a spread of Cu–S bond distances ranging from 2.39–2.48 Å. In the fourth Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with four CuS6 octahedra, corners with eight FeS6 octahedra, and corners with four SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 64–69°. There are four shorter (2.39 Å) and two longer (2.46 Å) Cu–S bond lengths. In the fifth Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with two equivalent CuS6 octahedra, corners with ten FeS6 octahedra, and corners with two SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 64–69°. There are a spread of Cu–S bond distances ranging from 2.37–2.47 Å. In the sixth Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with two equivalent CuS6 octahedra, corners with ten FeS6 octahedra, and corners with two SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 63–69°. There are a spread of Cu–S bond distances ranging from 2.36–2.47 Å. In the seventh Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with four CuS6 octahedra, corners with eight FeS6 octahedra, and corners with three SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 63–69°. There are a spread of Cu–S bond distances ranging from 2.38–2.48 Å. In the eighth Cu+1.50+ site, Cu+1.50+ is bonded to six S+1.20- atoms to form CuS6 octahedra that share corners with four equivalent CuS6 octahedra, corners with eight FeS6 octahedra, and corners with four SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 63–70°. There are four shorter (2.39 Å) and two longer (2.46 Å) Cu–S bond lengths. There are forty inequivalent S+1.20- sites. In the first S+1.20- site, S+1.20- is bonded in a 3-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.20 Å. In the second S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.15 Å. In the third S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.17 Å. In the fourth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.20 Å. In the fifth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.14 Å. In the sixth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to three Fe3+ and one S+1.20- atom. The S–S bond length is 2.20 Å. In the seventh S+1.20- site, S+1.20- is bonded to one Fe3+, two Cu+1.50+, and one S+1.20- atom to form distorted SFeCu2S tetrahedra that share a cornercorner with one FeS6 octahedra, corners with two CuS6 octahedra, and corners with six SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 69–80°. The S–S bond length is 2.09 Å. In the eighth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.14 Å. In the ninth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.16 Å. In the tenth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.11 Å. In the eleventh S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to three Fe3+ and one S+1.20- atom. The S–S bond length is 2.19 Å. In the twelfth S+1.20- site, S+1.20- is bonded to two Fe3+, one Cu+1.50+, and one S+1.20- atom to form distorted SFe2CuS tetrahedra that share a cornercorner with one FeS6 octahedra, corners with two CuS6 octahedra, and corners with two SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 72–81°. The S–S bond length is 2.11 Å. In the thirteenth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to one Fe3+, two Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.10 Å. In the fourteenth S+1.20- site, S+1.20- is bonded to one Fe3+, two Cu+1.50+, and one S+1.20- atom to form distorted SFeCu2S tetrahedra that share a cornercorner with one FeS6 octahedra, corners with two CuS6 octahedra, and corners with three SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 70–79°. The S–S bond length is 2.07 Å. In the fifteenth S+1.20- site, S+1.20- is bonded to one Fe3+, two Cu+1.50+, and one S+1.20- atom to form distorted SFeCu2S tetrahedra that share a cornercorner with one FeS6 octahedra, corners with two CuS6 octahedra, and corners with seven SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 69–80°. The S–S bond length is 2.08 Å. In the sixteenth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.16 Å. In the seventeenth S+1.20- site, S+1.20- is bonded to two Fe3+, one Cu+1.50+, and one S+1.20- atom to form distorted SFe2CuS tetrahedra that share a cornercorner with one FeS6 octahedra, corners with two CuS6 octahedra, and a cornercorner with one SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 72–81°. The S–S bond length is 2.11 Å. In the eighteenth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.15 Å. In the nineteenth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to one Fe3+, two Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.12 Å. In the twentieth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to one Fe3+, two Cu+1.50+, and one S+1.20- atom. The S–S bond length is 2.09 Å. In the twenty-first S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. In the twenty-second S+1.20- site, S+1.20- is bonded to one Fe3+, two Cu+1.50+, and one S+1.20- atom to form distorted SFeCu2S tetrahedra that share a cornercorner with one FeS6 octahedra, corners with two CuS6 octahedra, and corners with three SFeCu2S tetrahedra. The corner-sharing octahedra tilt angles range from 70–79°. In the twenty-third S+1.20- site, S+1.20- is bonded to two Fe3+, one Cu+1.50+, and one S+1.20- atom to form distorted SFe2CuS tetrahedra that share a cornercorner with one FeS6 octahedra, corners with two CuS6 octahedra, and corners with two SFe2CuS tetrahedra. The corner-sharing octahedra tilt angles range from 72–82°. In the twenty-fourth S+1.20- site, S+1.20- is bonded in a 4-coordinate geometry to two Fe3+, one Cu+1.50+, and one S+1.20- atom. In the tw

36 MATERIALS SCIENCE↗
DOE OSTI2026

Metal oxide-promoted calcium cuprate catalysts for diol oxidative dehydrocyclization to lactones

Here, this work investigates structure-function relationships in electronically tunable, redox-active, basic Cu-Ca mixed metal oxide catalysts for oxidative dehydrocyclization of liquid diols to lactones. Compositional screening identified Ni 2+ and Zn 2+ as effective promoters that increase the surface Cu 2+ population by ∼1.7× and Cu-normalized activity for liquid 1,4-butanediol conversion to γ-butyrolactone by ∼3–4×. In situ Raman spectroscopy, in situ X-ray absorption spectroscopy (XAS), in situ diffuse-reflectance Fourier transform infrared spectroscopy (DRIFTS), ex situ X-ray diffraction (XRD), and H 2 -temperature-programmed reduction (H 2 -TPR) show that Ni 2+ or Zn 2+ incorporation promotes the formation of Ca 0.82 Cu 1.00 O 2 nanoparticles under mild calcination conditions. This cuprate phase features stronger and shorter Cu–O bonds (1.90 Å) than inactive bulk CuO (1.95 Å) and square-planar Cu 2+ O 4 sites with enhanced d z2 electrophilicity, strengthening alkoxy adsorption. Pyridine-DRIFTS confirms the purely basic nature of the catalyst surface, while methanol-DRIFTS indicates Cu 2+ surface enrichment with Ni or Zn promotion, where Cu–O(Ca)–Cu sites can exist as amorphous domains or a truncation layer on crystalline nanoparticles.

09 BIOMASS FUELS↗
DOE OSTI2020

Materials Data on Cu2Sb by Materials Project

Cu2Sb crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. there are two inequivalent Cu+1.50+ sites. In the first Cu+1.50+ site, Cu+1.50+ is bonded in a 4-coordinate geometry to four equivalent Sb3- atoms. All Cu–Sb bond lengths are 2.73 Å. In the second Cu+1.50+ site, Cu+1.50+ is bonded to five equivalent Sb3- atoms to form a mixture of distorted corner and edge-sharing CuSb5 square pyramids. There are one shorter (2.66 Å) and four longer (2.84 Å) Cu–Sb bond lengths. Sb3- is bonded in a 9-coordinate geometry to nine Cu+1.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Oxygen-atom transfer photochemistry of a molecular copper bromate complex

Here, we report the synthesis and oxygen-atom transfer (OAT) photochemistry of [Cu(tpa)BrO 3 ]ClO 4 . In situ spectroscopy and in crystallo experiments indicate OAT proceeds from a Cu–O fragment generated by sequential Cu–O bond cleavage and OAT from BrO x to [Cu(tpa)] + . Furthermore, these results highlight synthetic opportunities in M–O photochemistry and demonstrate the utility of in crystallo experiments to evaluating photochemical reaction mechanisms.

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

Materials Data on Yb(CuGe)2 by Materials Project

YbCu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Yb–Cu bond lengths are 3.27 Å. All Yb–Ge bond lengths are 3.15 Å. Cu is bonded in a 4-coordinate geometry to four equivalent Yb and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.44 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Yb, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.46 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(CuGe)2 by Materials Project

CeCu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Ce–Cu bond lengths are 3.29 Å. All Ce–Ge bond lengths are 3.19 Å. Cu is bonded in a 4-coordinate geometry to four equivalent Ce and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.45 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Ce, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.50 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La(CuGe)2 by Materials Project

LaCu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. La is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All La–Cu bond lengths are 3.32 Å. All La–Ge bond lengths are 3.25 Å. Cu is bonded in a 4-coordinate geometry to four equivalent La and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.47 Å. Ge is bonded in a 9-coordinate geometry to four equivalent La, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.55 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(CuGe)2 by Materials Project

Sr(CuGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Sr–Cu bond lengths are 3.35 Å. All Sr–Ge bond lengths are 3.30 Å. Cu is bonded in a 4-coordinate geometry to four equivalent Sr and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.49 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sr, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.61 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(CuGe)2 by Materials Project

EuCu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Eu–Cu bond lengths are 3.32 Å. All Eu–Ge bond lengths are 3.23 Å. Cu is bonded in a 4-coordinate geometry to four equivalent Eu and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.47 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Eu, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.54 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(CuGe)2 by Materials Project

Ca(CuGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Ca–Cu bond lengths are 3.30 Å. All Ca–Ge bond lengths are 3.19 Å. Cu is bonded in a 4-coordinate geometry to four equivalent Ca and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.46 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Ca, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.50 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th(CuGe)2 by Materials Project

Th(CuGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Th is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Th–Cu bond lengths are 3.29 Å. All Th–Ge bond lengths are 3.22 Å. Cu is bonded in a 4-coordinate geometry to four equivalent Th and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.46 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Th, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.51 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr(CuGe)2 by Materials Project

PrCu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Pr–Cu bond lengths are 3.32 Å. All Pr–Ge bond lengths are 3.21 Å. Cu is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Ge atoms. All Cu–Ge bond lengths are 2.46 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Pr, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.54 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y5Mg13Cu5 by Materials Project

Y5Cu5Mg13 crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two Y5Cu5Mg13 sheets oriented in the (0, 1, 0) direction. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted linear geometry to two equivalent Cu atoms. Both Mg–Cu bond lengths are 2.84 Å. In the second Mg site, Mg is bonded in a distorted water-like geometry to two equivalent Cu atoms. Both Mg–Cu bond lengths are 2.74 Å. In the third Mg site, Mg is bonded in a distorted water-like geometry to two equivalent Cu atoms. Both Mg–Cu bond lengths are 2.74 Å. In the fourth Mg site, Mg is bonded to four Cu atoms to form a mixture of distorted corner and edge-sharing MgCu4 tetrahedra. There are a spread of Mg–Cu bond distances ranging from 2.75–2.83 Å. In the fifth Mg site, Mg is bonded in a single-bond geometry to one Cu atom. The Mg–Cu bond length is 2.76 Å. In the sixth Mg site, Mg is bonded in a distorted single-bond geometry to one Cu atom. The Mg–Cu bond length is 2.80 Å. In the seventh Mg site, Mg is bonded in a distorted water-like geometry to two equivalent Cu atoms. Both Mg–Cu bond lengths are 2.73 Å. In the eighth Mg site, Mg is bonded in a distorted L-shaped geometry to two equivalent Cu atoms. Both Mg–Cu bond lengths are 2.80 Å. There are three inequivalent Y sites. In the first Y site, Y is bonded in a 3-coordinate geometry to three Cu atoms. There are two shorter (2.97 Å) and one longer (3.06 Å) Y–Cu bond lengths. In the second Y site, Y is bonded in a 5-coordinate geometry to five Cu atoms. There are one shorter (2.97 Å) and four longer (2.99 Å) Y–Cu bond lengths. In the third Y site, Y is bonded in a 4-coordinate geometry to four Cu atoms. There are two shorter (3.02 Å) and two longer (3.04 Å) Y–Cu bond lengths. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a 9-coordinate geometry to five Mg and four Y atoms. In the second Cu site, Cu is bonded in a 9-coordinate geometry to five Mg and four Y atoms. In the third Cu site, Cu is bonded in a 9-coordinate geometry to six Mg and three Y atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cu3BO5 by Materials Project

Cu3BO5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Cu+2.33+ sites. In the first Cu+2.33+ site, Cu+2.33+ is bonded to six O2- atoms to form distorted edge-sharing CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 1.92–2.42 Å. In the second Cu+2.33+ site, Cu+2.33+ is bonded to six O2- atoms to form distorted edge-sharing CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 1.92–2.62 Å. In the third Cu+2.33+ site, Cu+2.33+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.85–2.74 Å. In the fourth Cu+2.33+ site, Cu+2.33+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.86 Å) and two longer (1.94 Å) Cu–O bond length. B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.37 Å) and two longer (1.39 Å) B–O bond length. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to four Cu+2.33+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Cu+2.33+ and one B3+ atom. In the third O2- site, O2- is bonded to four Cu+2.33+ atoms to form distorted corner-sharing OCu4 tetrahedra. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to three Cu+2.33+ and one B3+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three Cu+2.33+ and one B3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TmBeCu4 by Materials Project

BeTmCu4 crystallizes in the trigonal R3m space group. The structure is three-dimensional. Be is bonded to three equivalent Tm and nine Cu atoms to form a mixture of distorted corner and edge-sharing BeTm3Cu9 cuboctahedra. All Be–Tm bond lengths are 2.92 Å. There are a spread of Be–Cu bond distances ranging from 2.36–2.89 Å. Tm is bonded in a 10-coordinate geometry to three equivalent Be and thirteen Cu atoms. There are a spread of Tm–Cu bond distances ranging from 2.84–3.02 Å. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded in a 4-coordinate geometry to three equivalent Be, four equivalent Tm, and nine equivalent Cu atoms. There are three shorter (2.76 Å) and six longer (2.90 Å) Cu–Cu bond lengths. In the second Cu site, Cu is bonded in a 12-coordinate geometry to two equivalent Be, three equivalent Tm, and seven Cu atoms. There are two shorter (2.46 Å) and two longer (2.51 Å) Cu–Cu bond lengths.

36 MATERIALS SCIENCE↗