Premium
Formation of oxygen deficient BaPbO 3‐x by oxalate decomposition
Author(s) -
Franz A.,
Klimm D.,
Schmitz W.,
Haferkorn I.,
Bente K.
Publication year - 2011
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201000207
Subject(s) - oxalate , oxygen , decomposition , barium , chemistry , thermal decomposition , oxide , inorganic chemistry , chemical decomposition , organic chemistry
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 °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. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)