Thermal stability of the perovskite BaBiO[sub 3]

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,...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 146:2
Main Authors Klinkova, L.A., Barkovskii, N.V., Fedotov, V.K., Nikolaichik, V.I.
Format Journal Article
LanguageEnglish
Published United States 01.09.1999
Subjects
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
360204 - Ceramics, Cermets, & Refractories- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIAGRAMS
DIFFRACTION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
MATERIALS SCIENCE
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE STUDIES
PHYSICAL PROPERTIES
SCATTERING
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
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Summary: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.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1999.8390