Thermal stability of the perovskite BaBiO[sub 3]

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1999.8390· OSTI ID:6105390

Klinkova, L A; Barkovskii, N V; Fedotov, V K ^[1]; Nikolaichik, V I ^[2]

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1. Russian Academy of Sciences, Moscow (Russian Federation). Inst. of Solid State Physics
2. 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: 6105390
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 146:2; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

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