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200517.fm Page 28 Friday, March 18, 2005 2:52 PM
2005
Molybdenum
I 5600
Preparation of Co2-x ZnxMo3O8 Mixed Crystals with Defined Composition by
Chemical Vapor Transport. — Phase-pure powder samples of Co2-xZnxMo3O8
17- 028 (0
≤ x ≤ 2) are prepared by solid state reaction of stoichiometric mixtures of CoO, ZnO,
MoO3, and Mo (evacuated quartz tube, 1273 K, 5 d). Rietveld refinement of the powder
XRD data reveals a small but significant change of the lattice parameter as a function
of the Zn content, thus confirming the existence of a complete solid solution series.
Single crystals of Co2-xZnxMo3O8 can be grown by chemical vapor transport
(1273→1173 K) using a source material with a small oxygen excess and NH4Cl or
NH4Br as transport agent. — (STEINER, U.; REICHELT*, W.; DAMINOVA, S.;
LANGER, E.; Z. Anorg. Allg. Chem. 631 (2005) 2-3, 364-368; Inst. Anorg. Chem.,
TU Dresden, D-01069 Dresden, Germany; Ger., Abstr. Eng.) — Schramke
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