铌酸锶钡松弛剂的透射电镜研究

Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics Pub Date : 1994-08-07 DOI:10.1109/ISAF.1994.522439

Z. Xu, Weng-Hsing Huang, D. Viehland, R. Neurgaonkar

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引用次数: 0

摘要

透射电镜(TEM)对Sr/sub x/Ba/sub 1-x/Nb/sub 2/O/sub 6/ (SBN x/1-x)进行了研究。定向SBN 60/40和75/25晶体的亮场成像显示出具有强形状各向异性的纳米极畴。纳米极畴的形貌呈针状。选择区域电子衍射(SAED)模式揭示了1/x[110]不相称调制的存在。对不均匀反射的暗场成像发现了纳米级铁弹性畴的存在。在SAED模式中观察到沿。这种扩散散射被认为是由于a位阳离子分布和不通约之间的应变梯度相互作用引起的。

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Transmission electron microscopy study of strontium barium niobate relaxors

Transmission electron microscopy (TEM) investigations have been performed on Sr/sub x/Ba/sub 1-x/Nb/sub 2/O/sub 6/ (SBN x/1-x). Bright-field imaging of <100>-orientated SBN 60/40 and 75/25 crystals revealed nanopolar domains with a strong shape anisotropy. The morphology of the nanopolar domains was needle-like. Selected area electron diffraction (SAED) patterns revealed the existence of 1/x[110] incommensurate modulations. Dark-field imaging of the incommensurate reflections found the existence of nanometer-sized ferroelastic domains. Diffuse scattering was observed in the SAED patterns along the <100>. This diffuse scattering is believed to arise due to strain gradient interactions between the A-site cation distribution and the incommensuration.

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Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics

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