Thermal stability of the perovskite BaBiO{sub 3}
- Russian Academy of Sciences, Moscow (Russian Federation). Inst. of Solid State Physics
- Russian Academy of Sciences, Chernogolovka (Russian Federation). Inst. of Microelectronics Technology and High Purity Materials
Thermal stability of the perovskite BaBiO{sub 3} and phase relations in the BaO-BiO{sub 1.5}(BiO{sub 2.5}) system in the range of 45--55 mol%. BiO{sub 1.5} at p(O{sub 2}) = 0.21 atm have been studied by thermogravimetric analysis, differential thermal analysis, X-ray diffraction, chemical analysis, and transmission electron microscopy. It has been found that BaBiO{sub 3} loses oxygen in the temperature range between 600 and 1015 C with formation of the oxygen-deficient phases BaBiO{sub 2.88}, BaBiO{sub 2.83}, BaBiO{sub 2.75}, and BaBiO{sub 2.55}. BaBiO{sub 3} and the oxygen-deficient phases form two-phase regions involving phases of the perovskite series Ba{sub m}Bi{sub m+n}O{sub y} at the Bi-rich side and Ba{sub m+n}Bi{sub m}O{sub y} at the Ba-rich side. At 1015 C the BaBiO{sub 2.55} phase exhibits incongruent melting. At further increasing temperature the 1:1 (Ba:Bi) sample passes through a sequence of the crystallization fields of the Ba-rich phases of the compositions 5:4, 4:3, 3:2, 9:5, and 17:9, reaching the complete melting state at 1100 C.
- OSTI ID:
- 696678
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 146; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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