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The thermal degradation of (BAM) was investigated by forcibly annealing BAM particles in air at temperatures of 500-1300°C. Rietveld analysis with powder X-ray diffraction revealed novel lattice deformations in the thermally degraded BAM. The lattice constants c and a changed monotonically as annealing temperature increased, while the unit-cell volume showed no change with annealing up to 900°C, then abruptly expanded with 1100°C annealing. Furthermore, peak profile analysis revealed increasing lattice strain being induced in the host lattice. We suggest that the main cause of the thermal degradation of BAM is due to generation of a lattice vacancy like the Schottky defect.
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Yamada et al. (2004) studied this question.
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