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2004
Yttrium
I 2600
45- 020
YIHn: A New Family of Metal-Rich Hydride Halides. — The graphite-like yttrium
hydride halides YIHn (0.8 ≤ n ≤ 1.0) are prepared by heating either YI3/YH2 (1:2) or
stoichiometric YI3/YH2/Y mixtures at 900°C (sealed Ta-tube, 4—6 d; ≈100% yield). A
lower limit of the homogeneity range, n = 0.61, is determined by dehydrogenation experiments. All YIHn phases adopt the ZrBr type structure. The hydrogen variation is
accompanied by a change in the c lattice constant from 31.162 to 31.033 Å for n = 0.61
to 1.02. The YIHn phases reversibly react with H 2 at 400—600 °C to form YIH2. A miscibility gap exists between YIH and YIH2. The arrangement of the heavy atoms in YIH2
(space group P3m1; powder XRD) corresponds to a four-layer I—Y—Y—I slab with
the stacking sequence (AbaB). — (RYAZANOV, M.; SIMON*, A.; MATTAUSCH,
H.; Z. Anorg. Allg. Chem. 630 (2004) 10, 1401-1407; MPI Festkoerperforsch.,
D-70569 Stuttgart, Germany; Eng.) — Schramke
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