Add time:08/27/2019         Source:sciencedirect.com

The unit cell parameters of the trihydride GdH3 (Pearson symbol hP24, space group P3̄c1, HoH3 type) were determined employing Guinier powder diffraction patterns. The structure of the interstitial compound GdH3 is formed by departing from a hexagonal close-packed substructure of gadolinium and by filling its tetrahedral and triangular atomic positions with hydrogen atoms. The occupation of interstitial atomic positions in the hexagonal close-packed structure causes lattice dilatation associated with a significant change of the axial ratio c/a. In the intermediate phases of the binary system Gd–H, the interatomic distance between gadolinium and hydrogen atoms, dGd–H, decreases with increasing hydrogen content; the shortest dGd–H distance was observed to occur in GdH3. A set of powder diffraction data was obtained for GdH3.

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