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At least 325 records · Page 18
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

β- and γ-Counting for Pre-detonation Nuclear Forensics on Eu-155

Post-detonation nuclear forensics was performed at Los Alamos National Laboratory (LANL) on 155Eu, a fission product on the wing of the fission product production curve whose yield is sensitive to fission fuel and neutron energy. With a half-life of 4.753 years, 155Eu provides a longer-lived option for these measurements than other fission products with similar mass numbers. The Chemistry Division Group - Nuclear and Radiochemistry, at LANL routinely measures a suite of fission products from 235U fissions in thermal neutron flux experiments known as thermal calibration exercises, using a mixture of gas proportional β-decay counting and γ-spectrometry on HPGe detectors. The fission products of interest are reported relative to a high-yield reference fission product from the same sample to create a running average ratio specific to neutron energy and fuel type; Equation 1 below shows the ratio-of-ratios R-value measured fission products are reported in: R i x = [A( i X)/A( 99 Mo)] unknown [A( i X)/A( 99 Mo)] 235 U n,th where A denotes activity, i X is the nuclide of interest, and 235 U n,th denotes irradiations of 235 U with thermal neutrons. Measurements of unknown fission spectra are ratioed to a running-average of thermal calibration results, and the resulting R-value can be referred to as against a library of irradiation conditions.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
NASA NTRS1971

Partitioning of Eu and Sr between coexisting plagioclase and K-feldspar.

Minerals were separated by an EM approach and with the aid of liquids of great density. An analysis of K, Rb, Ca, Sr, Ha, and rare earth elements was conducted by means of a mass spectrometer isotope dilution technique. The behavior of the divalent europium ions during the partition process was found to be very similar to that of divalent strontium ions, taking into consideration data of the partition coefficients between coexisting feldspars in acidic rocks.

Nagasawa, H.↗
NASA NTRS1974

Modeling the evolution of Sm and Eu abundances during lunar igneous differentiation

The current work presents models for the evolution of europium and samarium abundances during lunar igneous processes. The effect of probable variations in lunar temperature and oxygen fugacity, mineral-liquid distribution coefficients, and the crystallization or melting progression are considered in the model calculations. Changes in the proportions of crystallizing phases strongly influence the evolution of trace element abundances during fractional crystallization, and models must include realistic estimates of the major phase equilibria during crystallization. The results are applied to evaluating the possibility of generating KREEP-rich materials by lunar igneous processes.

Weill, D. F.↗
NASA NTRS2016

Apatite/Melt Partitioning Experiments Reveal Redox Sensitivity to Cr, V, Mn, Ni, Eu, W, Th, and U

Apatite is a common mineral in terrestrial, planetary, and asteroidal materials. It is commonly used for geochronology (U-Pb), sensing volatiles (H, F, Cl, S), and can concentrate rare earth elements (REE) during magmatic fractionation and in general. Some recent studies have shown that some kinds of phosphate may fractionate Hf and W and that Mn may be redox sensitive. Experimental studies have focused on REE and other lithophile elements and at simplified or not specified oxygen fugacities. There is a dearth of partitioning data for chalcophile, siderophile and other elements between apatite and melt. Here we carry out several experiments at variable fO2 to study the partitioning of a broad range of trace elements. We compare to existing data and then focus on several elements that exhibit redox dependent partitioning behavior.

Righter, K.↗
DOE OSTI2020

Materials Data on Eu2H4Pd by Materials Project

Eu2PdH4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Eu sites. In the first Eu site, Eu is bonded in a 7-coordinate geometry to seven H atoms. There are a spread of Eu–H bond distances ranging from 2.63–2.91 Å. In the second Eu site, Eu is bonded in a 7-coordinate geometry to seven H atoms. There are a spread of Eu–H bond distances ranging from 2.63–2.90 Å. In the third Eu site, Eu is bonded in a 7-coordinate geometry to seven H atoms. There are a spread of Eu–H bond distances ranging from 2.63–2.91 Å. In the fourth Eu site, Eu is bonded in a 7-coordinate geometry to seven H atoms. There are a spread of Eu–H bond distances ranging from 2.62–2.90 Å. In the fifth Eu site, Eu is bonded in a 9-coordinate geometry to nine H atoms. There are a spread of Eu–H bond distances ranging from 2.46–2.78 Å. In the sixth Eu site, Eu is bonded in a 9-coordinate geometry to nine H atoms. There are a spread of Eu–H bond distances ranging from 2.46–2.78 Å. In the seventh Eu site, Eu is bonded in a 9-coordinate geometry to nine H atoms. There are a spread of Eu–H bond distances ranging from 2.46–2.78 Å. In the eighth Eu site, Eu is bonded in a 9-coordinate geometry to nine H atoms. There are a spread of Eu–H bond distances ranging from 2.47–2.78 Å. There are four inequivalent Pd sites. In the first Pd site, Pd is bonded in a tetrahedral geometry to four H atoms. There are a spread of Pd–H bond distances ranging from 1.76–1.82 Å. In the second Pd site, Pd is bonded in a tetrahedral geometry to four H atoms. There are a spread of Pd–H bond distances ranging from 1.76–1.82 Å. In the third Pd site, Pd is bonded in a tetrahedral geometry to four H atoms. There are a spread of Pd–H bond distances ranging from 1.76–1.81 Å. In the fourth Pd site, Pd is bonded in a tetrahedral geometry to four H atoms. There are a spread of Pd–H bond distances ranging from 1.76–1.82 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the second H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the third H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the fourth H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the fifth H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the sixth H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the seventh H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the eighth H site, H is bonded in a 5-coordinate geometry to four Eu and one Pd atom. In the ninth H site, H is bonded to four Eu and one Pd atom to form a mixture of edge and corner-sharing HEu4Pd trigonal bipyramids. In the tenth H site, H is bonded to four Eu and one Pd atom to form a mixture of edge and corner-sharing HEu4Pd trigonal bipyramids. In the eleventh H site, H is bonded to four Eu and one Pd atom to form a mixture of edge and corner-sharing HEu4Pd trigonal bipyramids. In the twelfth H site, H is bonded to four Eu and one Pd atom to form a mixture of distorted edge and corner-sharing HEu4Pd trigonal bipyramids. In the thirteenth H site, H is bonded to four Eu and one Pd atom to form a mixture of distorted edge and corner-sharing HEu4Pd square pyramids. In the fourteenth H site, H is bonded to four Eu and one Pd atom to form a mixture of distorted edge and corner-sharing HEu4Pd square pyramids. In the fifteenth H site, H is bonded to four Eu and one Pd atom to form a mixture of distorted edge and corner-sharing HEu4Pd square pyramids. In the sixteenth H site, H is bonded to four Eu and one Pd atom to form a mixture of distorted edge and corner-sharing HEu4Pd square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu8Ni18P11 by Materials Project

Eu8Ni18P11 crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are five inequivalent Eu sites. In the first Eu site, Eu is bonded in a 12-coordinate geometry to ten Ni and six P atoms. There are a spread of Eu–Ni bond distances ranging from 2.96–3.15 Å. There are two shorter (3.01 Å) and four longer (3.03 Å) Eu–P bond lengths. In the second Eu site, Eu is bonded in a 10-coordinate geometry to eight Ni and six P atoms. There are four shorter (3.03 Å) and four longer (3.14 Å) Eu–Ni bond lengths. There are two shorter (3.02 Å) and four longer (3.03 Å) Eu–P bond lengths. In the third Eu site, Eu is bonded in a 12-coordinate geometry to twelve Ni and four equivalent P atoms. There are a spread of Eu–Ni bond distances ranging from 2.97–3.15 Å. All Eu–P bond lengths are 3.08 Å. In the fourth Eu site, Eu is bonded in a 10-coordinate geometry to eight Ni and six P atoms. There are a spread of Eu–Ni bond distances ranging from 2.99–3.15 Å. There are a spread of Eu–P bond distances ranging from 3.00–3.04 Å. In the fifth Eu site, Eu is bonded to six equivalent Ni and six equivalent P atoms to form face-sharing EuNi6P6 cuboctahedra. All Eu–Ni bond lengths are 3.05 Å. All Eu–P bond lengths are 3.03 Å. There are nine inequivalent Ni sites. In the first Ni site, Ni is bonded in a 3-coordinate geometry to six Eu and three P atoms. There are two shorter (2.32 Å) and one longer (2.33 Å) Ni–P bond lengths. In the second Ni site, Ni is bonded in a 3-coordinate geometry to six Eu and three P atoms. There are one shorter (2.30 Å) and two longer (2.31 Å) Ni–P bond lengths. In the third Ni site, Ni is bonded in a 3-coordinate geometry to three Eu, one Ni, and three P atoms. The Ni–Ni bond length is 2.55 Å. There are one shorter (2.23 Å) and two longer (2.37 Å) Ni–P bond lengths. In the fourth Ni site, Ni is bonded in a distorted single-bond geometry to two equivalent Eu, four equivalent Ni, and one P atom. All Ni–Ni bond lengths are 2.48 Å. The Ni–P bond length is 2.16 Å. In the fifth Ni site, Ni is bonded in a 10-coordinate geometry to two equivalent Eu and eight Ni atoms. Both Ni–Ni bond lengths are 2.37 Å. In the sixth Ni site, Ni is bonded in a distorted trigonal planar geometry to six Eu and three P atoms. There are two shorter (2.27 Å) and one longer (2.31 Å) Ni–P bond lengths. In the seventh Ni site, Ni is bonded to four Eu and four P atoms to form a mixture of distorted face, edge, and corner-sharing NiEu4P4 tetrahedra. There are a spread of Ni–P bond distances ranging from 2.32–2.36 Å. In the eighth Ni site, Ni is bonded to four Eu and four P atoms to form a mixture of distorted face, edge, and corner-sharing NiEu4P4 tetrahedra. There are three shorter (2.34 Å) and one longer (2.36 Å) Ni–P bond lengths. In the ninth Ni site, Ni is bonded to four Eu and four P atoms to form a mixture of distorted face and edge-sharing NiEu4P4 tetrahedra. There are two shorter (2.31 Å) and two longer (2.33 Å) Ni–P bond lengths. There are six inequivalent P sites. In the first P site, P is bonded in a 9-coordinate geometry to four Eu and five Ni atoms. In the second P site, P is bonded in a 3-coordinate geometry to six Eu and three Ni atoms. In the third P site, P is bonded in a 3-coordinate geometry to six equivalent Eu and three equivalent Ni atoms. In the fourth P site, P is bonded in a 9-coordinate geometry to four equivalent Eu and five Ni atoms. In the fifth P site, P is bonded in a 9-coordinate geometry to four Eu and five Ni atoms. In the sixth P site, P is bonded in a 9-coordinate geometry to two equivalent Eu and seven Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu6Sb6S17 by Materials Project

Eu6Sb6S14(S3) crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. there are six inequivalent Eu+2.67+ sites. In the first Eu+2.67+ site, Eu+2.67+ is bonded to seven S2- atoms to form distorted EuS7 pentagonal bipyramids that share a cornercorner with one SbS5 square pyramid and edges with two equivalent EuS7 pentagonal bipyramids. There are a spread of Eu–S bond distances ranging from 3.00–3.12 Å. In the second Eu+2.67+ site, Eu+2.67+ is bonded to seven S2- atoms to form distorted EuS7 pentagonal bipyramids that share a cornercorner with one SbS5 square pyramid and edges with two equivalent EuS7 pentagonal bipyramids. There are a spread of Eu–S bond distances ranging from 2.96–3.25 Å. In the third Eu+2.67+ site, Eu+2.67+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Eu–S bond distances ranging from 2.98–3.26 Å. In the fourth Eu+2.67+ site, Eu+2.67+ is bonded in a 9-coordinate geometry to nine S2- atoms. There are a spread of Eu–S bond distances ranging from 3.03–3.41 Å. In the fifth Eu+2.67+ site, Eu+2.67+ is bonded in a 9-coordinate geometry to nine S2- atoms. There are a spread of Eu–S bond distances ranging from 3.00–3.23 Å. In the sixth Eu+2.67+ site, Eu+2.67+ is bonded in a 9-coordinate geometry to nine S2- atoms. There are a spread of Eu–S bond distances ranging from 3.01–3.22 Å. There are six inequivalent Sb3+ sites. In the first Sb3+ site, Sb3+ is bonded in a distorted rectangular see-saw-like geometry to four S2- atoms. There are a spread of Sb–S bond distances ranging from 2.50–2.98 Å. In the second Sb3+ site, Sb3+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Sb–S bond distances ranging from 2.47–3.13 Å. In the third Sb3+ site, Sb3+ is bonded in a distorted rectangular see-saw-like geometry to four S2- atoms. There are a spread of Sb–S bond distances ranging from 2.47–3.13 Å. In the fourth Sb3+ site, Sb3+ is bonded to five S2- atoms to form SbS5 square pyramids that share corners with two EuS7 pentagonal bipyramids. There are a spread of Sb–S bond distances ranging from 2.46–3.12 Å. In the fifth Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to four S2- atoms. There are a spread of Sb–S bond distances ranging from 2.47–3.28 Å. In the sixth Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Sb–S bond distances ranging from 2.47–2.55 Å. There are seventeen inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to four Eu+2.67+ and one S2- atom. The S–S bond length is 2.12 Å. In the second S2- site, S2- is bonded in a 6-coordinate geometry to four Eu+2.67+ and two S2- atoms. The S–S bond length is 2.12 Å. In the third S2- site, S2- is bonded in a 5-coordinate geometry to four Eu+2.67+ and one S2- atom. In the fourth S2- site, S2- is bonded to four Eu+2.67+ and one Sb3+ atom to form distorted SEu4Sb trigonal bipyramids that share corners with four SEu4Sb trigonal bipyramids, edges with three SEu4Sb trigonal bipyramids, and edges with two SEu2Sb2 trigonal pyramids. In the fifth S2- site, S2- is bonded in a 3-coordinate geometry to one Eu+2.67+ and two Sb3+ atoms. In the sixth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to one Eu+2.67+ and three Sb3+ atoms. In the seventh S2- site, S2- is bonded to four Eu+2.67+ and one Sb3+ atom to form distorted SEu4Sb trigonal bipyramids that share corners with two equivalent SEu4Sb trigonal bipyramids, corners with two SEu2Sb2 trigonal pyramids, and edges with four SEu4Sb trigonal bipyramids. In the eighth S2- site, S2- is bonded to four Eu+2.67+ and one Sb3+ atom to form distorted SEu4Sb trigonal bipyramids that share corners with four SEu4Sb trigonal bipyramids, corners with two SEu2Sb2 trigonal pyramids, and edges with three SEu4Sb trigonal bipyramids. In the ninth S2- site, S2- is bonded in a 5-coordinate geometry to one Eu+2.67+ and four Sb3+ atoms. In the tenth S2- site, S2- is bonded in a 3-coordinate geometry to one Eu+2.67+ and two Sb3+ atoms. In the eleventh S2- site, S2- is bonded in a 5-coordinate geometry to four Eu+2.67+ and one Sb3+ atom. In the twelfth S2- site, S2- is bonded to four Eu+2.67+ and one Sb3+ atom to form distorted SEu4Sb trigonal bipyramids that share corners with four SEu4Sb trigonal bipyramids, edges with two SEu4Sb trigonal bipyramids, and edges with two SEu2Sb2 trigonal pyramids. In the thirteenth S2- site, S2- is bonded to two Eu+2.67+ and two Sb3+ atoms to form SEu2Sb2 trigonal pyramids that share corners with two SEu4Sb trigonal bipyramids, corners with two equivalent SEu2Sb2 trigonal pyramids, and edges with three SEu4Sb trigonal bipyramids. In the fourteenth S2- site, S2- is bonded to two Eu+2.67+ and two Sb3+ atoms to form distorted SEu2Sb2 trigonal pyramids that share corners with two SEu4Sb trigonal bipyramids, corners with two equivalent SEu2Sb2 trigonal pyramids, and edges with three SEu4Sb trigonal bipyramids. In the fifteenth S2- site, S2- is bonded in a 4-coordinate geometry to two Eu+2.67+ and two Sb3+ atoms. In the sixteenth S2- site, S2- is bonded in a 4-coordinate geometry to three Eu+2.67+ and one Sb3+ atom. In the seventeenth S2- site, S2- is bonded to four Eu+2.67+ and one Sb3+ atom to form distorted SEu4Sb trigonal bipyramids that share corners with two equivalent SEu4Sb trigonal bipyramids, edges with four SEu4Sb trigonal bipyramids, and edges with two SEu2Sb2 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu16Sb11 by Materials Project

Eu16Sb11 crystallizes in the orthorhombic P2_12_12 space group. The structure is three-dimensional. there are nine inequivalent Eu+2.06+ sites. In the first Eu+2.06+ site, Eu+2.06+ is bonded to six Sb3- atoms to form distorted EuSb6 octahedra that share corners with seven EuSb6 octahedra, a cornercorner with one EuSb4 tetrahedra, corners with four EuSb5 trigonal bipyramids, corners with two equivalent EuSb4 trigonal pyramids, edges with two EuSb6 octahedra, an edgeedge with one EuSb4 tetrahedra, edges with two EuSb5 trigonal bipyramids, and faces with five EuSb6 octahedra. The corner-sharing octahedra tilt angles range from 27–51°. There are a spread of Eu–Sb bond distances ranging from 3.34–3.53 Å. In the second Eu+2.06+ site, Eu+2.06+ is bonded to six Sb3- atoms to form distorted EuSb6 octahedra that share corners with seven EuSb6 octahedra, a cornercorner with one EuSb4 tetrahedra, corners with four EuSb5 trigonal bipyramids, corners with two equivalent EuSb4 trigonal pyramids, edges with two EuSb6 octahedra, an edgeedge with one EuSb4 tetrahedra, edges with two EuSb5 trigonal bipyramids, and faces with five EuSb6 octahedra. The corner-sharing octahedra tilt angles range from 27–51°. There are a spread of Eu–Sb bond distances ranging from 3.32–3.53 Å. In the third Eu+2.06+ site, Eu+2.06+ is bonded to four Sb3- atoms to form EuSb4 trigonal pyramids that share corners with eight EuSb6 octahedra, a cornercorner with one EuSb4 tetrahedra, corners with four EuSb5 trigonal bipyramids, edges with two EuSb6 octahedra, edges with two EuSb5 trigonal bipyramids, and an edgeedge with one EuSb4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 33–93°. There are a spread of Eu–Sb bond distances ranging from 3.18–3.29 Å. In the fourth Eu+2.06+ site, Eu+2.06+ is bonded to four Sb3- atoms to form EuSb4 tetrahedra that share corners with twelve EuSb6 octahedra, corners with four EuSb5 trigonal bipyramids, corners with two equivalent EuSb4 trigonal pyramids, and edges with four EuSb6 octahedra. The corner-sharing octahedra tilt angles range from 35–54°. There are two shorter (3.18 Å) and two longer (3.33 Å) Eu–Sb bond lengths. In the fifth Eu+2.06+ site, Eu+2.06+ is bonded to six Sb3- atoms to form distorted EuSb6 octahedra that share corners with seven EuSb6 octahedra, corners with two equivalent EuSb4 tetrahedra, corners with four EuSb5 trigonal bipyramids, corners with two equivalent EuSb4 trigonal pyramids, edges with two EuSb6 octahedra, an edgeedge with one EuSb5 trigonal bipyramid, an edgeedge with one EuSb4 trigonal pyramid, faces with three EuSb6 octahedra, and faces with two equivalent EuSb5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 36–65°. There are a spread of Eu–Sb bond distances ranging from 3.20–3.75 Å. In the sixth Eu+2.06+ site, Eu+2.06+ is bonded to six Sb3- atoms to form distorted EuSb6 octahedra that share corners with seven EuSb6 octahedra, corners with two equivalent EuSb4 tetrahedra, corners with four EuSb5 trigonal bipyramids, corners with two equivalent EuSb4 trigonal pyramids, edges with two EuSb6 octahedra, an edgeedge with one EuSb5 trigonal bipyramid, an edgeedge with one EuSb4 trigonal pyramid, faces with three EuSb6 octahedra, and faces with two equivalent EuSb5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 36–65°. There are a spread of Eu–Sb bond distances ranging from 3.21–3.73 Å. In the seventh Eu+2.06+ site, Eu+2.06+ is bonded in a distorted see-saw-like geometry to four Sb3- atoms. There are two shorter (3.26 Å) and two longer (3.33 Å) Eu–Sb bond lengths. In the eighth Eu+2.06+ site, Eu+2.06+ is bonded to five Sb3- atoms to form EuSb5 trigonal bipyramids that share corners with eight EuSb6 octahedra, a cornercorner with one EuSb4 tetrahedra, corners with three equivalent EuSb5 trigonal bipyramids, corners with two equivalent EuSb4 trigonal pyramids, edges with three EuSb6 octahedra, edges with two EuSb5 trigonal bipyramids, an edgeedge with one EuSb4 trigonal pyramid, and faces with two equivalent EuSb6 octahedra. The corner-sharing octahedra tilt angles range from 3–59°. There are a spread of Eu–Sb bond distances ranging from 3.28–3.55 Å. In the ninth Eu+2.06+ site, Eu+2.06+ is bonded to five Sb3- atoms to form EuSb5 trigonal bipyramids that share corners with eight EuSb6 octahedra, a cornercorner with one EuSb4 tetrahedra, corners with three equivalent EuSb5 trigonal bipyramids, corners with two equivalent EuSb4 trigonal pyramids, edges with three EuSb6 octahedra, edges with two EuSb5 trigonal bipyramids, an edgeedge with one EuSb4 trigonal pyramid, and faces with two equivalent EuSb6 octahedra. The corner-sharing octahedra tilt angles range from 2–57°. There are a spread of Eu–Sb bond distances ranging from 3.27–3.57 Å. There are seven inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in a 8-coordinate geometry to eight Eu+2.06+ atoms. In the second Sb3- site, Sb3- is bonded in a 8-coordinate geometry to eight Eu+2.06+ atoms. In the third Sb3- site, Sb3- is bonded in a 8-coordinate geometry to eight Eu+2.06+ atoms. In the fourth Sb3- site, Sb3- is bonded in a 6-coordinate geometry to six Eu+2.06+ atoms. In the fifth Sb3- site, Sb3- is bonded in a 8-coordinate geometry to eight Eu+2.06+ atoms. In the sixth Sb3- site, Sb3- is bonded in a 8-coordinate geometry to eight Eu+2.06+ atoms. In the seventh Sb3- site, Sb3- is bonded in a body-centered cubic geometry to eight Eu+2.06+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu3(B3Rh4)2 by Materials Project

Eu3(Rh4B3)2 crystallizes in the orthorhombic Fmmm space group. The structure is three-dimensional. there are three inequivalent Eu sites. In the first Eu site, Eu is bonded in a 6-coordinate geometry to one Eu, ten Rh, and six equivalent B atoms. The Eu–Eu bond length is 3.15 Å. There are a spread of Eu–Rh bond distances ranging from 3.05–3.30 Å. There are two shorter (2.97 Å) and four longer (3.21 Å) Eu–B bond lengths. In the second Eu site, Eu is bonded in a 12-coordinate geometry to two Eu, twelve Rh, and six equivalent B atoms. The Eu–Eu bond length is 3.15 Å. There are four shorter (3.16 Å) and eight longer (3.18 Å) Eu–Rh bond lengths. There are four shorter (3.22 Å) and two longer (3.30 Å) Eu–B bond lengths. In the third Eu site, Eu is bonded in a 6-coordinate geometry to one Eu, ten Rh, and six equivalent B atoms. There are a spread of Eu–Rh bond distances ranging from 3.05–3.30 Å. There are two shorter (2.97 Å) and four longer (3.21 Å) Eu–B bond lengths. There are three inequivalent Rh sites. In the first Rh site, Rh is bonded in a distorted square co-planar geometry to four Eu and four B atoms. There are two shorter (2.18 Å) and two longer (2.21 Å) Rh–B bond lengths. In the second Rh site, Rh is bonded in a 4-coordinate geometry to four equivalent Eu and four equivalent B atoms. All Rh–B bond lengths are 2.13 Å. In the third Rh site, Rh is bonded in a distorted square co-planar geometry to four Eu and four B atoms. There are two shorter (2.14 Å) and two longer (2.21 Å) Rh–B bond lengths. There are four inequivalent B sites. In the first B site, B is bonded in a 6-coordinate geometry to three equivalent Eu and six Rh atoms. Both B–Rh bond lengths are 2.21 Å. In the second B site, B is bonded in a 5-coordinate geometry to three equivalent Eu and five Rh atoms. In the third B site, B is bonded in a 6-coordinate geometry to three equivalent Eu and six Rh atoms. There are two shorter (3.22 Å) and one longer (3.30 Å) B–Eu bond lengths. All B–Rh bond lengths are 2.18 Å. In the fourth B site, B is bonded in a 6-coordinate geometry to three equivalent Eu and six Rh atoms. There are two shorter (3.22 Å) and one longer (3.30 Å) B–Eu bond lengths. All B–Rh bond lengths are 2.18 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu8In3 by Materials Project

Eu8In3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are eight inequivalent Eu sites. In the first Eu site, Eu is bonded in a 3-coordinate geometry to three In atoms. There are a spread of Eu–In bond distances ranging from 3.49–3.84 Å. In the second Eu site, Eu is bonded in a 4-coordinate geometry to four In atoms. There are a spread of Eu–In bond distances ranging from 3.31–3.78 Å. In the third Eu site, Eu is bonded in a 4-coordinate geometry to four In atoms. There are a spread of Eu–In bond distances ranging from 3.42–3.67 Å. In the fourth Eu site, Eu is bonded in a 4-coordinate geometry to four In atoms. There are a spread of Eu–In bond distances ranging from 3.37–3.74 Å. In the fifth Eu site, Eu is bonded in a 4-coordinate geometry to four In atoms. There are a spread of Eu–In bond distances ranging from 3.35–3.76 Å. In the sixth Eu site, Eu is bonded in a 2-coordinate geometry to four In atoms. There are a spread of Eu–In bond distances ranging from 3.37–3.86 Å. In the seventh Eu site, Eu is bonded in a distorted trigonal non-coplanar geometry to three In atoms. There are a spread of Eu–In bond distances ranging from 3.42–3.53 Å. In the eighth Eu site, Eu is bonded in a distorted trigonal non-coplanar geometry to three In atoms. There are a spread of Eu–In bond distances ranging from 3.41–3.59 Å. There are four inequivalent In sites. In the first In site, In is bonded in a 10-coordinate geometry to ten Eu atoms. In the second In site, In is bonded in a 10-coordinate geometry to ten Eu atoms. In the third In site, In is bonded in a body-centered cubic geometry to eight Eu atoms. In the fourth In site, In is bonded in a distorted q6 geometry to ten Eu atoms.

36 MATERIALS SCIENCE↗