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首页> 外文期刊>Physics of the solid state >Formation of new structural states in compressed BaTiO3 nanopowders
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Formation of new structural states in compressed BaTiO3 nanopowders

机译:在压缩BATIO3纳米粉织机中形成新的结构状态

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摘要

The structural changes in BaTiO3 nanocrystal powder and tablets have been probed via X-ray diffraction, scanning electron and transmission microscopy, and differential calorimetry after successive hightemperature annealing in air. It is shown that, beginning with the annealing temperature of 1200A degrees C, significant amount of the Ba2TiO4 phase forms in the tablets together with the BaTiO3 phase. This phase is equilibrium one; it practically vanishes when the annealing temperature decreases to 700-600A degrees C; and this phase practically restored to the initial state when the annealing temperature is again increased to 1200A degrees C. Annealing the powders causes no formation of new phases, but an increase in their crystallite sizes. A probable reason of the emergence of Ba2TiO4 phase in tablets and its absence in free powder is discussed, as well.
机译:BATIO3纳米晶体粉末和片剂的结构变化通过X射线衍射,扫描电子和透射显微镜探测,并且在空气中连续的高温退火后的差分量热法。 结果表明,从1200A℃的退火温度开始,在片剂中与BATIO3相中的显着量的Ba2tiO 4相。 该阶段是平衡的; 当退火温度降至700-600A的C时,它实际消失; 并且该阶段实际上恢复到初始状态,当退火温度再次增加到1200A的C.退火粉末导致不形成新相,但它们的微晶尺寸的增加。 还讨论了片剂中Ba2tio4相的出现的可能原因及其在自由粉末中的不存在。

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