Title: Stability, Oxygen Nonstoichiometry, and Transformations of the Bi2Sr2CoO6+δCeramic
Abstract: Thermogravimetry at 20–900°C and 10−3–1 atm of oxygen partial pressure (pO2) has been used to establish a region of stability and oxygen nonstoichiometry of the compound Bi2Sr2CoO6+δ. This phase was found to be unstable below 850°C at high oxygen partial pressures (air, oxygen), whereas at low oxygen concentrations in the gas phase (pO2=1.5×10−3–2×10−2atm) it exhibits stability in the entire temperature region under investigation. Within, the region of stability, the oxygen content in Bi2Sr2CoO6+δ(6+δ) has been determined under equilibrium conditions as a function of temperature and oxygen partial pressure and the corresponding defect model has been proposed. The annealing of Bi2Sr2CoO6+δoutside the region of stability is found to result in the formation of Bi2Sr3Co2O9and the binary compounds of the Bi2O3–SrO system. The kinetics of this transformation has been studied at 700–850°C in a pure oxygen atmosphere and a possible interpretation has been given.
Publication Year: 1998
Publication Date: 1998-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 3
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