Department of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea.
Microsc Microanal. 2013 Aug;19 Suppl 5:123-6. doi: 10.1017/S1431927613012476.
The electron energy loss spectroscopy (EELS) technique was applied to investigate the local variation in the phase of barium titanate (BaTiO₃) ceramics. It was found that the fine structure of the titanium L₂,₃ edge and their satellite peaks were sensitively varied with the tetragonal-cubic phase transition. The peak splitting of Ti-L₃ edge of tetragonal-phased BaTiO₃ ceramics was widened because of the increased crystal field effect compared with that of cubic-phased BaTiO₃. In case of nanoscale BaTiO₃ powders, the L₃ edge splitting of the core region was found to be smaller than that of the shell region. The energy gap between peaks t₂g and eg varied from 2.36 to 1.94 eV with changing the probe position from 1 to 20 nm from the surface. These results suggest that the EELS technique can be used to identify the local phase of sintered BaTiO₃ ceramics.
电子能量损失谱（EELS）技术被应用于研究钛酸钡（BaTiO₃）陶瓷的局部相变化。结果发现，钛 L₂,₃ 边缘及其卫星峰的精细结构随四方-立方相转变而发生灵敏变化。与立方相 BaTiO₃ 相比，四方相 BaTiO₃ 陶瓷的 Ti-L₃ 边缘的峰分裂由于晶体场效应的增加而变宽。对于纳米级 BaTiO₃ 粉末，发现核区的 L₃ 边缘分裂小于壳区。随着从表面向 1 到 20nm 探针位置的变化，t₂g 和 eg 峰之间的能隙从 2.36 变为 1.94eV。这些结果表明，EELS 技术可用于识别烧结 BaTiO₃ 陶瓷的局部相。
