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Bi 32 ZnSb 32 O 7 pyrochlore was prepared both by conventional solid-state reaction of mixed oxides and by a coprecipitation method, and the reaction sequence to pyrochlore via both methods was investigated. In the mixed oxide powder pyrochlore is formed above 700°C with the appearance of 24Bi 2 O 3 .ZnO (Bi 48 ZnO 73 ) compound...