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High-Temperature Incommensurate-to-Commensurate Phase Transition in the Bi2MoO6 Catalyst

✍ Scribed by D.J. Buttrey; T. Vogt; B.D. White

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 325 KB
Volume: 155
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.8935

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✦ Synopsis

The temperature-dependent behavior of the low-and intermediate-temperature phases of -Bi 2 MoO 6 were investigated. As revealed by high-resolution neutron and synchrotron powder di4raction as well as electron di4raction, the low-temperature Aurivillius phase shows a previously undetected incommensurate modulation along the pseudo-tetragonal a (q a ‫؍‬ 0.5626(2)) and c (q c ‫؍‬ 0.2844(2)) axes. A reversible incommensurate-to-commensurate phase transition to the intermediate-temperature phase occurs near 840 K, before irreversibly transforming near 880 K into the 6uorite-related high-temperature polymorph described in detail by two of us in an earlier study (Buttrey et al., J. Solid State Chem. 111, 118+127 (1994)).

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