Affiliation:
1. Institut für Anorganische Chemie der Christian-Albrechts-Universität, Olshausenstraße 40, D-24098 Kiel
2. Sonderdruckanforderungen an Prof. Dr. Hk. Müller-Buschbaum
Abstract
Single crystals of Ce2(WO4)3 have been prepared by crystallisation from molten mixtures of WO3 and CeO2. The compound shows monoclinic symmetry, a = 7.813(4), b = 11.720(2), c = 11.586(3), β = 109.36(3)°, Z = 4, and is isotypic to Eu2(WO4)3, but shows large differences of the atomic coordinates especially of oxygen. The crystal structure of Ce2(WO4)3 is characterized by W(1)O4 tetrahedra, square W(2)O5 pyramids and a distorted capped trigonal prism of oxygen around cerium. The decrease of the oxidation states of Ce4+ or W6+ was proved by thermogravimetric and magnetic measurements as well as by calculations of the Coulomb terms of lattice energy.
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18 articles.
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