Crystal structure of the rhombohedral phase of PbZr1-xTixO3 ceramics at room temperature
Crystal structure of the rhombohedral phase of PbZr1-xTixO3 ceramics at room temperature
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DOI：
10.1103/physrevb.80.104109
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发表时间：
2009-09
影响因子：
3.7
通讯作者：
H. Yokota;N. Zhang;A. Taylor;P. Thomas;A. Glazer
中科院分区：
文献类型：
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作者：
H. Yokota;N. Zhang;A. Taylor;P. Thomas;A. Glazer
采用混合氧化物法和溶胶-凝胶法制备了PbZr（1-x）TixO（3）（PZT）陶瓷，并利用高分辨飞行时间中子衍射仪对样品进行了Rietveld精修.已经使用了不同的结构模型，但是已经发现最佳拟合是使用菱形R3 c（C-3 nu（6））和单斜晶系Cm（C-s（3））的混合物跨越整个菱形范围，其中单斜相的比例随着组分x朝向准同型相边界连续增加。通过这两种途径制备的陶瓷之间存在一些差异，特别是在衍射峰宽度方面，这表明这些材料中的精确结构排列取决于制备方法。结果表明，在该区域制备的PZT陶瓷通常由混合相组成，这是PZT相图中没有发现单斜相和菱方相之间相界的原因。
PbZr(1-x)TixO(3) (PZT) ceramics made by mixed-oxide and sol-gel routes within the rhombohedral region of the phase diagram have been prepared, and their structures determined by Rietveld refinement using high-resolution time-of-flight neutron diffraction. Different structural models have been used but the best fits have been found using a mixture of rhombohedral R3c (C-3 nu(6)) and monoclinic Cm (C-s(3)) across the whole rhombohedral range with the proportion of monoclinic phase increasing continuously with composition x toward the morphotropic phase boundary. Some differences are found between the ceramics prepared by the two routes, especially with respect to the diffraction peak widths, suggesting that the precise structural arrangements in these materials depend on the method of preparation. The results show that PZT ceramics made in this region always consist of mixed phases and this accounts for the fact that no phase boundary has been discovered in the PZT phase diagram between the monoclinic and rhombohedral phases.