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- W1964856405 abstract "Solid state phase equilibria in the ternary Gd–Si–B phase diagram have been proposed at 1270 K using X-ray diffraction, scanning electron microscopy and electron probe microanalysis. Prior to this work, the binary systems Gd–B, Gd–Si and Si–B have also been reinvestigated. The main characteristic of the ternary diagram is the occurrence of two new ternary compounds Gd5Si2B8 and Gd5Si3B0.64. The former crystallizes in tetragonal symmetry, space group P4/mbm with unit cell parameters a=7.2665(3), c=8.2229(7) Å, the second one presents hexagonal symmetry, space group P63/mcm with unit cell parameters a=8.5080(4),c=6.4141(2) Å. The X-ray structures of the two structurally related phases Gd5Si3B0.64 and host binary Gd5Si3 have been refined from three-dimensional single-crystal intensity data to the final R values of 0.036 (Rw=0.046) and 0.046 (Rw=0.055) for 457 and 401 reflections, respectively with [F>4σ(F)]. Both structures exhibit the Mn5Si3-type structure, with in addition for Gd5Si3B0.64 a partial occupancy by boron of the normally vacant interstitial site at the center of the Gd6 octahedron, which corresponds to the origin of the unit cell. Bonding between the interstitial boron atoms and the gadolinium ones forming the Gd6B polyhedra is indicated by the decrease in the corresponding Gd–Gd distances and consequently in the unit cell volume. Finally, the Gd–Si–B phase diagram is compared with the previously reported Er–Si–B, at 1070 K." @default.
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- W1964856405 date "2004-02-01" @default.
- W1964856405 modified "2023-10-12" @default.
- W1964856405 title "Solid state phase equilibria in the Gd–Si–B system at 1270K" @default.
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- W1964856405 doi "https://doi.org/10.1016/j.jssc.2003.02.011" @default.
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