科研之友
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摘要
The effect of mechanochemical processing in air and water on the physicochemical transformations of barium titanyl oxalate has been studied using X-ray diffraction, thermal analysis, FTIR spectroscopy, temperature-programmed argon desorption, and particle size measurements. The results demonstrate that mechanochemical processing of barium titanyl oxalate in air leads to the formation of structurally imperfect barium titanate. During subsequent air calcination at 550 degrees C, this material transforms into well-crystallized cubic BaTiO3, whereas thermal decomposition of barium titanyl oxalate only yields cubic BaTiO3 starting at 800 degrees C. Mechanochemical processing in water leads to partial amorphization of barium titanyl oxalate, and conversion of the product to BaTiO3 requires heat treatment at 700 degrees C. All of the BaTiO3 samples obtained via mechanochemical processing have a larger specific surface in comparison with samples prepared by conventional calcination of barium titanyl oxalate or other known processes.
- 出版日期2008-6
