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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on EuGa by Materials Project

EuGa crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded in a 7-coordinate geometry to eight Ga atoms. There are a spread of Eu–Ga bond distances ranging from 3.17–3.62 Å. In the second Eu site, Eu is bonded in a 7-coordinate geometry to seven Ga atoms. There are a spread of Eu–Ga bond distances ranging from 3.19–3.53 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to seven Eu and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.66 Å. In the second Ga site, Ga is bonded in a 10-coordinate geometry to eight Eu and two equivalent Ga atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu7Cu44As23 by Materials Project

Eu7Cu44As23 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Eu+2.43+ sites. In the first Eu+2.43+ site, Eu+2.43+ is bonded in a 8-coordinate geometry to eight As+2.65- atoms. There are four shorter (3.19 Å) and four longer (3.46 Å) Eu–As bond lengths. In the second Eu+2.43+ site, Eu+2.43+ is bonded in a body-centered cubic geometry to eight equivalent As+2.65- atoms. All Eu–As bond lengths are 3.15 Å. There are three inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four As+2.65- atoms to form a mixture of edge and corner-sharing CuAs4 tetrahedra. There are three shorter (2.48 Å) and one longer (2.55 Å) Cu–As bond lengths. In the second Cu1+ site, Cu1+ is bonded to four As+2.65- atoms to form a mixture of distorted edge and corner-sharing CuAs4 tetrahedra. There are two shorter (2.45 Å) and two longer (2.51 Å) Cu–As bond lengths. In the third Cu1+ site, Cu1+ is bonded to four As+2.65- atoms to form a mixture of distorted edge and corner-sharing CuAs4 tetrahedra. There are a spread of Cu–As bond distances ranging from 2.52–2.69 Å. There are four inequivalent As+2.65- sites. In the first As+2.65- site, As+2.65- is bonded in a cuboctahedral geometry to twelve equivalent Cu1+ atoms. In the second As+2.65- site, As+2.65- is bonded in a body-centered cubic geometry to eight equivalent Cu1+ atoms. In the third As+2.65- site, As+2.65- is bonded in a 10-coordinate geometry to two equivalent Eu+2.43+ and eight Cu1+ atoms. In the fourth As+2.65- site, As+2.65- is bonded in a 10-coordinate geometry to four Eu+2.43+ and six Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu5Ge3 by Materials Project

Eu5Ge3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded to five Ge atoms to form a mixture of distorted edge, face, and corner-sharing EuGe5 trigonal bipyramids. There are a spread of Eu–Ge bond distances ranging from 3.19–3.32 Å. In the second Eu site, Eu is bonded in a distorted square co-planar geometry to six Ge atoms. There are four shorter (3.17 Å) and two longer (3.77 Å) Eu–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to eight Eu and one Ge atom. The Ge–Ge bond length is 2.59 Å. In the second Ge site, Ge is bonded in a 10-coordinate geometry to ten Eu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu3Si4 by Materials Project

Eu3Si4 crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. there are two inequivalent Eu+2.67+ sites. In the first Eu+2.67+ site, Eu+2.67+ is bonded to twelve Si2- atoms to form a mixture of edge and face-sharing EuSi12 cuboctahedra. There are a spread of Eu–Si bond distances ranging from 3.20–3.42 Å. In the second Eu+2.67+ site, Eu+2.67+ is bonded in a 7-coordinate geometry to seven Si2- atoms. There are a spread of Eu–Si bond distances ranging from 3.11–3.24 Å. There are two inequivalent Si2- sites. In the first Si2- site, Si2- is bonded in a 9-coordinate geometry to seven Eu+2.67+ and two equivalent Si2- atoms. Both Si–Si bond lengths are 2.40 Å. In the second Si2- site, Si2- is bonded in a 9-coordinate geometry to six Eu+2.67+ and three Si2- atoms. The Si–Si bond length is 2.37 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2Ga7Ag by Materials Project

Eu2AgGa7 crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to two equivalent Ag and fourteen Ga atoms. Both Eu–Ag bond lengths are 3.51 Å. There are a spread of Eu–Ga bond distances ranging from 3.32–3.51 Å. Ag is bonded to four equivalent Eu and eight Ga atoms to form distorted AgEu4Ga8 cuboctahedra that share corners with four equivalent AgEu4Ga8 cuboctahedra, corners with twelve GaEu4Ga8 cuboctahedra, edges with two equivalent GaEu4Ga8 cuboctahedra, faces with four equivalent AgEu4Ga8 cuboctahedra, and faces with four equivalent GaEu4Ga4Ag4 cuboctahedra. There are four shorter (2.64 Å) and four longer (3.08 Å) Ag–Ga bond lengths. There are five inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to four equivalent Eu, two equivalent Ag, and three Ga atoms. There are one shorter (2.50 Å) and two longer (2.64 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 9-coordinate geometry to four equivalent Eu and five Ga atoms. All Ga–Ga bond lengths are 2.64 Å. In the third Ga site, Ga is bonded to four equivalent Eu and eight Ga atoms to form distorted GaEu4Ga8 cuboctahedra that share corners with eight equivalent AgEu4Ga8 cuboctahedra, corners with eight GaEu4Ga8 cuboctahedra, edges with two equivalent GaEu4Ga4Ag4 cuboctahedra, and faces with eight GaEu4Ga8 cuboctahedra. All Ga–Ga bond lengths are 3.08 Å. In the fourth Ga site, Ga is bonded to four equivalent Eu, four equivalent Ag, and four equivalent Ga atoms to form GaEu4Ga4Ag4 cuboctahedra that share corners with sixteen GaEu4Ga8 cuboctahedra, edges with two equivalent GaEu4Ga8 cuboctahedra, faces with four equivalent AgEu4Ga8 cuboctahedra, and faces with four equivalent GaEu4Ga4Ag4 cuboctahedra. In the fifth Ga site, Ga is bonded to four equivalent Eu and eight Ga atoms to form distorted GaEu4Ga8 cuboctahedra that share corners with four equivalent AgEu4Ga8 cuboctahedra, corners with twelve GaEu4Ga8 cuboctahedra, edges with two equivalent AgEu4Ga8 cuboctahedra, and faces with eight GaEu4Ga8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu3B2Pt7 by Materials Project

Eu3Pt7B2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Eu+2.67+ sites. In the first Eu+2.67+ site, Eu+2.67+ is bonded in a 12-coordinate geometry to twelve Pt2- atoms. There are a spread of Eu–Pt bond distances ranging from 3.29–3.36 Å. In the second Eu+2.67+ site, Eu+2.67+ is bonded to twelve equivalent Pt2- atoms to form EuPt12 cuboctahedra that share edges with six equivalent EuPt12 cuboctahedra, edges with six equivalent PtEu6Pt6 cuboctahedra, and faces with six equivalent BPt6 pentagonal pyramids. All Eu–Pt bond lengths are 3.20 Å. There are two inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a distorted L-shaped geometry to five Eu+2.67+, one Pt2-, and two equivalent B3+ atoms. The Pt–Pt bond length is 2.86 Å. There are one shorter (2.20 Å) and one longer (2.25 Å) Pt–B bond lengths. In the second Pt2- site, Pt2- is bonded to six equivalent Eu+2.67+ and six equivalent Pt2- atoms to form PtEu6Pt6 cuboctahedra that share corners with six equivalent BPt6 pentagonal pyramids, edges with six equivalent EuPt12 cuboctahedra, edges with six equivalent PtEu6Pt6 cuboctahedra, and faces with two equivalent BPt6 pentagonal pyramids. B3+ is bonded to six equivalent Pt2- atoms to form distorted BPt6 pentagonal pyramids that share corners with three equivalent PtEu6Pt6 cuboctahedra, edges with three equivalent BPt6 pentagonal pyramids, a faceface with one PtEu6Pt6 cuboctahedra, and faces with three equivalent EuPt12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Canted antiferromagnetic phases in the candidate layered Weyl material EuMnSb 2

EuMnSb 2 is a candidate topological material which can be tuned towards a Weyl semimetal, but there are differing reports for its antiferromagnetic (AFM) phases. The coupling of bands dominated by pure Sb layers hosting topological fermions to Mn and Eu magnetic states provides a potential path to tune the topological properties. In this study we present single-crystal neutron diffraction, magnetization, and heat-capacity data as well as polycrystalline 151 Eu Mössbauer data which show that three AFM phases exist as a function of temperature, and we present a detailed analysis of the magnetic structure in each phase. The Mn magnetic sublattice orders into a C-type AFM structure below T N Mn = 323 (1) K with the ordered Mn magnetic moment μ Mn lying perpendicular to the layers. AFM ordering of the Eu sublattice occurs below T N Eu1 = 23 (1) K with the ordered Eu magnetic moment μ Eu canted away from the layer normal and μ Mn retaining its higher temperature order. μ Eu is ferromagnetically aligned within each Eu layer but exhibits a complicated AFM layer stacking. Both of these higher-temperature phases are described by magnetic space group (MSG) $\mathcal{Pn'm'a'}$ with the chemical and magnetic unit cells having the same dimensions. Cooling below T N Eu2 =9 (1) K reveals a third AFM phase where μ Mn remains unchanged but μ Eu develops an additional substantial in-plane canting. This phase has MSG $\mathcal{P11}$ $\frac{2_1}{a′}$. We also find some evidence of short-range magnetic correlations associated with the Eu between 12 K≲ T≲ 30 K . Using the determined magnetic structures, we postulate the signs of nearest-neighbor intralayer and interlayer exchange constants and the magnetic anisotropy within a general Heisenberg model. We then discuss implications of the various AFM states in EuMnSb 2 and their potential for tuning topological properties.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2024

Continuous pressure-induced valence and magnetic transitions in EuMnSb 2

EuMnSb 2 is a unique and promising compound with complex magnetism (Eu and Mn sublattices) to realize magnetic control of topological quasiparticles. By applying pressure (P) to this system, we have observed a continuous pressure-induced valence change from Eu 2+ to Eu 3+ . Remarkably, despite the significant valence change in Eu ions, an extremely large increase in the magnetic ordering temperature (T N,Eu ) from 21 K at ambient pressure to 180 K at 28.4 GPa is detected.The substantial enhancement in T N,Eu is likely the consequence of the reduced distance between neighboring Eu ions and the enhanced indirect exchange interaction through increased 4f -5d mixing under pressure. Furthermore, T N,Eu (P) shows a discontinuous change above 8 GPa, although the orthorhombic crystal structure remains stable. Our experimental data indicate the record high value in the magnetic hyperfine field of 151 Eu, reaching 74.1 T at 28.4 GPa and 26 K. In conclusion, these unusual electronic and magnetic transitions revealed by pressure highlight that EuMnSb 2 is a rich magnetic topological semimetal candidate for investigating a multitude of strong correlations.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
NASA NTRS1983

Chemistry of the Apollo 11 highland component

Thirty-eight Apollo 11 lunar highland fragments from coarse fines 10085 have been subjected to petrologic and chemical study. Six major chemical groups are identified: (a) high-K KREEP; (b) anorthosite with a 10X chondrite positive Eu anomaly and anorthosite with 30X positive Eu anomaly; (c) ANT; (d) LKFM; (e) anorthositic gabbro with no Eu anomaly, with a positive Eu anomaly, and with a negative Eu anomaly; and (f) dominant Highland component, 2X-10X chondrite with a positive 10X-14X Eu anomaly. Newly recognized groups are presented based on the REE patterns: (a) ANT group with 5X La and a 22X positive Eu anomaly; (b) 10X flat with 14X positive Eu anomaly; and (c) 2-3X flat with a 10X positive Eu anomaly. The highland suite is very low in K and REE, and is overall quite similar to the Apollo 16 suite.

Laul, J. C.↗
DOE OSTI2020

Materials Data on Eu3(Cu2Sn)4 by Materials Project

Eu3Cu8Sn4 is Hexagonal Laves-derived structured and crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to eight Cu and six Sn atoms. There are a spread of Eu–Cu bond distances ranging from 3.22–3.59 Å. There are a spread of Eu–Sn bond distances ranging from 3.30–3.40 Å. There are four inequivalent Cu sites. In the first Cu site, Cu is bonded to two equivalent Eu, seven Cu, and three equivalent Sn atoms to form distorted CuEu2Cu7Sn3 cuboctahedra that share corners with four equivalent CuEu2Cu7Sn3 cuboctahedra, corners with five equivalent SnEu4Cu8 cuboctahedra, faces with six equivalent SnEu4Cu8 cuboctahedra, and faces with eight CuEu2Cu7Sn3 cuboctahedra. There are a spread of Cu–Cu bond distances ranging from 2.51–2.77 Å. There are one shorter (2.70 Å) and two longer (2.75 Å) Cu–Sn bond lengths. In the second Cu site, Cu is bonded to nine Cu and three equivalent Sn atoms to form CuCu9Sn3 cuboctahedra that share corners with three equivalent SnEu4Cu8 cuboctahedra, faces with six equivalent SnEu4Cu8 cuboctahedra, and faces with eight CuEu2Cu7Sn3 cuboctahedra. All Cu–Cu bond lengths are 2.63 Å. All Cu–Sn bond lengths are 2.74 Å. In the third Cu site, Cu is bonded in a 10-coordinate geometry to six equivalent Eu and four Sn atoms. There are three shorter (2.66 Å) and one longer (2.78 Å) Cu–Sn bond lengths. In the fourth Cu site, Cu is bonded in a 12-coordinate geometry to four equivalent Eu, four Cu, and four Sn atoms. There are a spread of Cu–Sn bond distances ranging from 2.73–2.96 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded to four equivalent Eu and eight Cu atoms to form distorted SnEu4Cu8 cuboctahedra that share corners with four equivalent SnEu4Cu8 cuboctahedra, corners with six CuEu2Cu7Sn3 cuboctahedra, faces with eight CuEu2Cu7Sn3 cuboctahedra, and faces with eight equivalent SnEu4Cu8 cuboctahedra. In the second Sn site, Sn is bonded in a 10-coordinate geometry to six equivalent Eu and four Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuB2Rh3 by Materials Project

EuRh3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to two equivalent Eu, twelve equivalent Rh, and six equivalent B atoms. Both Eu–Eu bond lengths are 2.96 Å. All Eu–Rh bond lengths are 3.20 Å. All Eu–B bond lengths are 3.27 Å. Rh is bonded in a distorted square co-planar geometry to four equivalent Eu and four equivalent B atoms. All Rh–B bond lengths are 2.21 Å. B is bonded in a 6-coordinate geometry to three equivalent Eu and six equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu3TaO6 by Materials Project

Eu3TaO6 is (Cubic) Perovskite-like structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Eu+2.33+ sites. In the first Eu+2.33+ site, Eu+2.33+ is bonded to twelve equivalent O2- atoms to form EuO12 cuboctahedra that share corners with twelve equivalent EuO12 cuboctahedra, faces with six equivalent EuO12 cuboctahedra, faces with four equivalent EuO6 octahedra, and faces with four equivalent TaO6 octahedra. All Eu–O bond lengths are 3.01 Å. In the second Eu+2.33+ site, Eu+2.33+ is bonded to six equivalent O2- atoms to form EuO6 octahedra that share corners with six equivalent TaO6 octahedra and faces with eight equivalent EuO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Eu–O bond lengths are 2.27 Å. Ta5+ is bonded to six equivalent O2- atoms to form TaO6 octahedra that share corners with six equivalent EuO6 octahedra and faces with eight equivalent EuO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Ta–O bond lengths are 1.99 Å. O2- is bonded in a distorted linear geometry to five Eu+2.33+ and one Ta5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuSi2(NO)2 by Materials Project

EuSi2O2N2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Eu2+ sites. In the first Eu2+ site, Eu2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Eu–N bond length is 2.84 Å. There are a spread of Eu–O bond distances ranging from 2.53–2.69 Å. In the second Eu2+ site, Eu2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Eu–N bond length is 2.96 Å. There are a spread of Eu–O bond distances ranging from 2.49–2.74 Å. In the third Eu2+ site, Eu2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Eu–N bond length is 2.83 Å. There are a spread of Eu–O bond distances ranging from 2.51–2.68 Å. In the fourth Eu2+ site, Eu2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Eu–N bond length is 2.95 Å. There are a spread of Eu–O bond distances ranging from 2.50–2.74 Å. There are eight inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.73–1.77 Å. The Si–O bond length is 1.63 Å. In the second Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is two shorter (1.75 Å) and one longer (1.76 Å) Si–N bond length. The Si–O bond length is 1.64 Å. In the third Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is two shorter (1.75 Å) and one longer (1.76 Å) Si–N bond length. The Si–O bond length is 1.63 Å. In the fourth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.74–1.77 Å. The Si–O bond length is 1.64 Å. In the fifth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.73–1.76 Å. The Si–O bond length is 1.63 Å. In the sixth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. All Si–N bond lengths are 1.75 Å. The Si–O bond length is 1.63 Å. In the seventh Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is two shorter (1.75 Å) and one longer (1.76 Å) Si–N bond length. The Si–O bond length is 1.63 Å. In the eighth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.74–1.77 Å. The Si–O bond length is 1.63 Å. There are eight inequivalent N3- sites. In the first N3- site, N3- is bonded in a distorted trigonal planar geometry to one Eu2+ and three Si4+ atoms. In the second N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the third N3- site, N3- is bonded in a distorted trigonal planar geometry to one Eu2+ and three Si4+ atoms. In the fourth N3- site, N3- is bonded in a trigonal planar geometry to one Eu2+ and three Si4+ atoms. In the fifth N3- site, N3- is bonded in a distorted trigonal planar geometry to one Eu2+ and three Si4+ atoms. In the sixth N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the seventh N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the eighth N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three Eu2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to three Eu2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to three Eu2+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu3Ag2 by Materials Project

Eu3Ag2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded in a 6-coordinate geometry to six equivalent Ag atoms. There are two shorter (3.38 Å) and four longer (3.39 Å) Eu–Ag bond lengths. In the second Eu site, Eu is bonded in a square co-planar geometry to four equivalent Ag atoms. All Eu–Ag bond lengths are 3.39 Å. Ag is bonded in a 9-coordinate geometry to eight Eu and one Ag atom. The Ag–Ag bond length is 2.97 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu3Ga2 by Materials Project

Eu3Ga2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded in a 6-coordinate geometry to six equivalent Ga atoms. There are a spread of Eu–Ga bond distances ranging from 3.13–3.52 Å. In the second Eu site, Eu is bonded in a 6-coordinate geometry to six equivalent Ga atoms. There are a spread of Eu–Ga bond distances ranging from 3.34–3.49 Å. Ga is bonded in a 10-coordinate geometry to nine Eu and one Ga atom. The Ga–Ga bond length is 2.58 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2Al3Ag by Materials Project

Eu2AgAl3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to four equivalent Eu, three equivalent Ag, and nine equivalent Al atoms. There are one shorter (3.42 Å) and three longer (3.52 Å) Eu–Eu bond lengths. All Eu–Ag bond lengths are 3.36 Å. All Eu–Al bond lengths are 3.34 Å. Ag is bonded to six equivalent Eu and six equivalent Al atoms to form AgEu6Al6 cuboctahedra that share corners with six equivalent AgEu6Al6 cuboctahedra, corners with twelve equivalent AlEu6Al4Ag2 cuboctahedra, edges with six equivalent AgEu6Al6 cuboctahedra, and faces with eighteen equivalent AlEu6Al4Ag2 cuboctahedra. All Ag–Al bond lengths are 2.84 Å. Al is bonded to six equivalent Eu, two equivalent Ag, and four equivalent Al atoms to form AlEu6Al4Ag2 cuboctahedra that share corners with four equivalent AgEu6Al6 cuboctahedra, corners with fourteen equivalent AlEu6Al4Ag2 cuboctahedra, edges with six equivalent AlEu6Al4Ag2 cuboctahedra, faces with six equivalent AgEu6Al6 cuboctahedra, and faces with twelve equivalent AlEu6Al4Ag2 cuboctahedra. All Al–Al bond lengths are 2.87 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu3Rh by Materials Project

Eu3Rh is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded in a 2-coordinate geometry to three equivalent Rh atoms. There are a spread of Eu–Rh bond distances ranging from 2.95–3.50 Å. In the second Eu site, Eu is bonded in a bent 150 degrees geometry to two equivalent Rh atoms. There are one shorter (2.92 Å) and one longer (2.97 Å) Eu–Rh bond lengths. Rh is bonded in a 6-coordinate geometry to eight Eu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu5As3 by Materials Project

Eu5As3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Eu sites. In the first Eu site, Eu is bonded to six equivalent As atoms to form a mixture of distorted corner, edge, and face-sharing EuAs6 octahedra. The corner-sharing octahedral tilt angles are 35°. All Eu–As bond lengths are 3.24 Å. In the second Eu site, Eu is bonded in a 3-coordinate geometry to five equivalent As atoms. There are a spread of Eu–As bond distances ranging from 3.04–3.64 Å. As is bonded in a 9-coordinate geometry to nine Eu atoms.

36 MATERIALS SCIENCE↗