Atomic and electronic characterization of the α[100] dislocation core in SrTiO3
Atomic and electronic characterization of the α[100] dislocation core in SrTiO3
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DOI：
10.1103/physrevb.66.094108
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发表时间：
2002-09
影响因子：
3.7
通讯作者：
Zaoli Zhang;W. Sigle;M. Rühle
中科院分区：
文献类型：
--
作者：
Zaoli Zhang;W. Sigle;M. Rühle
用高分辨透射电子显微镜和电子能量损失谱研究了SrTiO 3中α [100]刃位错的结构和化学性质。位错核是致密的，在{100}面上只有轻微的解离。这表明{100}反相边界能量高。Ti-L2，3边和氧K边的形状在位错核中相对于体块略有变化。在纤芯中，晶场分裂减少了0.2- 0.4eV，而L3/L2、Ti/O和eg/t2 g强度比增加。结构模型提出，表现出带电的，缺氧的位错核心。这与以前的塑性实验和阻抗谱测量结果雅阁。
The structure and chemistry of the a[100] edge-dislocation core in SrTiO 3 was investigated by high-resolution transmission electron microscopy and electron-energy-loss spectroscopy. The dislocation core is found to be compact, with only a slight dissociation on the {100} plane. This indicates that the {100} antiphase boundary energy is high. The shapes of the Ti-L 2 , 3 edge and the oxygen K edge slightly change in the dislocation core with respect to the bulk. In the core, the crystal-field splitting is decreased by 0.2-0.4 eV while the L 3 /L 2 , the Ti/O, and the e g /t 2 g intensity ratios are increased. Structure models are proposed that exhibit a charged, oxygen-deficient dislocation core. This is in good accord with previous plasticity experiments and impedance spectroscopy measurements.