Highly Conductive Oxides, CeVO4, Ce1−xMxVO4−0.5x(M=Ca, Sr, Pb) and Ce1−yBiyVO4, with Zircon-Type Structure Prepared by Solid-State Reaction in Air
✍ Scribed by Akiteru Watanabe
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 190 KB
- Volume
- 153
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The zircon-type phases, CeVO 4 , Ce 1؊x M x VO 4؊0.5x (04x40.41 for M ؍ Ca, 04x40.21 for M ؍ Sr, and 04x40.1 for M ؍ Pb) and Ce 1؊y Bi y VO 4 (04y40.68), have been prepared in air by heating the stoichiometric mixture of CeO 2 , V 2 O 5 , CaCO 3 , SrCO 3 , PbO, and Bi 2 O 3 . During solidstate reaction, the spontaneous reduction of Ce(IV) to Ce(III) begins above 5003C and proceeds rapidly at about 6663C in conjunction with the melting of V 2 O 5 . All of these phases present high electrical conduction. In particular, the phases Ce 1؊x M x VO 4؊0.5x (M ؍ Ca, Sr, and Pb) show excellently high values. The compound CeVO 4 is characterized as a p-type semiconductor by the Seebeck e4ect.