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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on YFe3(BO3)4 by Materials Project

YFe3(BO3)4 is Calcite-derived structured and crystallizes in the trigonal R32 space group. The structure is three-dimensional. Y3+ is bonded to six equivalent O2- atoms to form distorted YO6 pentagonal pyramids that share corners with six equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 59°. All Y–O bond lengths are 2.36 Å. Fe3+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with two equivalent YO6 pentagonal pyramids and edges with two equivalent FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.01–2.06 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. All B–O bond lengths are 1.38 Å. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All B–O bond lengths are 1.38 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe3+ and one B3+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Y3+, one Fe3+, and one B3+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe3+ and one B3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YFe3 by Materials Project

YFe3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a 12-coordinate geometry to twelve Fe atoms. There are a spread of Y–Fe bond distances ranging from 2.95–3.05 Å. In the second Y site, Y is bonded in a 6-coordinate geometry to eighteen Fe atoms. There are six shorter (2.95 Å) and twelve longer (3.22 Å) Y–Fe bond lengths. There are four inequivalent Fe sites. In the first Fe site, Fe is bonded to five Y and seven Fe atoms to form a mixture of edge, face, and corner-sharing FeY5Fe7 cuboctahedra. There are a spread of Fe–Fe bond distances ranging from 2.45–2.56 Å. In the second Fe site, Fe is bonded in a 12-coordinate geometry to three equivalent Y and six equivalent Fe atoms. In the third Fe site, Fe is bonded in a 12-coordinate geometry to three equivalent Y and six equivalent Fe atoms. In the fourth Fe site, Fe is bonded to six equivalent Y and six equivalent Fe atoms to form FeY6Fe6 cuboctahedra that share corners with twelve equivalent FeY5Fe7 cuboctahedra, edges with six equivalent FeY6Fe6 cuboctahedra, and faces with eighteen equivalent FeY5Fe7 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YFe3(BO3)4 by Materials Project

YFe3(BO3)4 is Calcite-derived structured and crystallizes in the trigonal P3_121 space group. The structure is three-dimensional. Y3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Y–O bond distances ranging from 2.34–2.41 Å. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six O2- atoms to form edge-sharing FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.00–2.06 Å. In the second Fe3+ site, Fe3+ is bonded to six O2- atoms to form edge-sharing FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 2.00–2.09 Å. There are three inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.38 Å) and two longer (1.39 Å) B–O bond length. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. All B–O bond lengths are 1.38 Å. In the third B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.37–1.39 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Y3+, one Fe3+, and one B3+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Fe3+ and one B3+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Y3+, one Fe3+, and one B3+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe3+ and one B3+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Y3+, one Fe3+, and one B3+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe3+ and one B3+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Fe3+ and one B3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Thermodynamics and Magnetism of YCo5 Compound Doped with Fe and Ni: An Ab Initio Study

YCo5 permanent magnet exhibits high uniaxial magnetocrystalline anisotropy energy and has a high Curie temperature. These are good properties for a permanent magnet, but YCo5 has a low energy product, which is notably insufficient for a permanent magnet. In order to improve the energy product in YCo5, we suggest replacing cobalt with iron, which has a much bigger magnetic moment. With a combination of density-functional-theory calculations and thermodynamic CALculation of PHAse Diagrams (CALPHAD) modeling, we show that a new magnet, YFe3(Ni1-xCox)2, is thermodynamically stable and exhibits an improved energy product without significant detrimental effects on the magnetocrystalline anisotropy energy or the Curie temperature.

anisotropy↗