In situ high-resolution transmission electron microscopy of dislocation formation and dynamics during the crystallization of amorphous SrTiO3
In situ high-resolution transmission electron microscopy of dislocation formation and dynamics during the crystallization of amorphous SrTiO3
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非晶 SrTiO3 结晶过程中位错形成和动力学的原位高分辨率透射电子显微镜
DOI：
10.1016/j.actamat.2004.12.034
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发表时间：
2005
期刊：
影响因子：
9.4
通讯作者：
D. Brunner
中科院分区：
文献类型：
--
作者：
S. Lee;W. Sigle;F. Phillipp;D. Brunner
报道了离子球磨SrTiO_3样品在925和940°C退火过程中的原位高分辨率TEM成像。在室温下的离子铣削过程中被非晶化的区域被观察到结晶，形成低角度晶界。在晶界处，观察到了完全的a/2位错和两个攀移解离的a/2位错。实验观测还包括动态位错现象，如滑移、攀移和湮灭。有趣的是，在小角度晶界中的两个a/2 <$011 <$部分位错的分离不是恒定的，而是暂时地在2nm的平均值附近波动。
In situ high-resolution TEM imaging of an ion-milled SrTiO3sample during annealing at 925 and 940°C is reported. Regions that were amorphized during the ion-milling at room temperature are observed to crystallize, forming low-angle grain boundaries. At the grain boundaries, perfect a〈001〉 dislocations and two climb-dissociated a/2〈011〉 dislocations were observed. The experimental observations also include dynamic dislocation phenomena, such as glide, climb, and annihilation. Interestingly, the separation of the two a/2〈011〉 partial dislocations in the low-angle grain boundaries is not constant, but temporarily fluctuates around a mean value of 2nm.