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中文摘要：
采用溶剂热法一步合成了3～5nm单分散纳米晶钛酸钡（BaTiO3）粉体，利用原位变温Raman光谱研究了纳米晶BaTi03粉体的微区结构特性。结果表明：纳米晶BaTi03相变区间弥散，呈现多相共存的结构特性；即使晶粒尺寸小到5nm，仍然具有与大晶粒BaTiO3陶瓷类似的行为，即随温度升高经历从三方相→正交相→四方相→立方相的连续相变。
英文摘要：
Nanocrystalline barium titanate （ BaTiO3 ） powders with the grain size of 3-- 5 nm were prepared by an one-step solvo-thermal method. The analysis by in-situ heating Raman spectroscopy revealed the dispersive phase transition character in the nanocrystalline BaTiO3 powders. The BaTiO3 powders with the nanograin of 5 nm exhibit the similar phase transformations from rhombohedral to orthorhombic, then to tetragonal, and finally to cubic as those in the coarse BaTiO3 ceramics.
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