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Formation of oxygen deficient BaPbO3-x by oxalate decomposition

✍ Scribed by A. Franz; D. Klimm; W. Schmitz; I. Haferkorn; K. Bente

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
280 KB
Volume
46
Category
Article
ISSN
0232-1300

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✦ Synopsis

BaPbO 3 is assumed to be oxygen deficient but the exact determination has never been reported. The aim of this study is to investigate the correlation between synthetic conditions and the resulting oxygen deficiency of BaPbO 3-x . The formation of BaPbO 3-x by decomposition of barium-and lead oxalate up to 850 Β°C is significantly faster compared to conventional high temperature solid state reactions of oxide compounds. The discrete reaction steps were studied by simultaneous thermal analysis and X-ray powder diffraction. The oxygen content was determined by temperature-programmed reduction analysis. It is shown that the formation process is very sensitive to the chosen starting materials leading to different oxygen deficits caused by partial oxidation from Pb 2+ to Pb 4+ . The resulting perovskites show chemical compositions of BaPbO 2.74 and BaPbO 2.82 . The varying oxygen deficits should have an effect on structural properties.

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