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Stability, Oxygen Nonstoichiometry, and Transformations of the Bi2Sr2CoO6+δCeramic

✍ Scribed by M.V. Zinkevich; S.A. Prodan; Yu.G. Zonov; V.V. Vashook

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
232 KB
Volume
136
Category
Article
ISSN
0022-4596

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✦ Synopsis

Thermogravimetry at 20-900°°C and 10 ؊3 -1 atm of oxygen partial pressure (pO 2 ) has been used to establish a region of stability and oxygen nonstoichiometry of the compound Bi 2 Sr 2 CoO 6؉ . 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 (pO 2 ‫5.1؍‬ ؋ 10 ؊3 -2 ؋ 10 ؊2 atm) it exhibits stability in the entire temperature region under investigation. Within, the region of stability, the oxygen content in Bi 2 Sr 2 CoO 6؉ (6؉ ) 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 Bi 2 Sr 2 CoO 6؉ outside the region of stability is found to result in the formation of Bi 2 Sr 3 Co 2 O 9 and the binary compounds of the Bi 2 O 3 -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.

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