Comment on 'Pb_(1-x)Ca_xTiO_3 solid solution (x=0.0, 0.25, 0.50, and 0.75): A theoretical and experimental approach'

Amreesh Chandra

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Comment on 'Pb_(1-x)Ca_xTiO_3 solid solution (x=0.0, 0.25, 0.50, and 0.75): A theoretical and experimental approach'

机译：评论“ Pb_（1-x）Ca_xTiO_3固溶体（x = 0.0、0.25、0.50和0.75）：理论和实验方法”

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The evolution of different phases in the important ferroelectric material Pb_(1-x)Ca_xTiO_3 for different values of x has recently been studied by de Lazaro et al. [Phys. Rev. B 75, 144111 (2007)] using x-ray diffraction (XRD) and Raman techniques, arriving at self-contradictory results (pseudocubic from XRD and noncubic from Raman). A "tailing" of many Bragg peaks can be seen in the XRD data of de Lazaro et al., similar to that observed by Chandra and Pandey [J. Mater. Res. 18, 407 (2003)], but this has not been included in their analysis. Our detailed Rietveld analysis has shown that for 0.40≤x≤0.56, the orthorhombic (Pbnm) and tetragonal {PAmm) phases coexist. We also present our Raman data, which differ with those of de Lazaro et al. but follow an expected sequential change in the entire compositional range.

机译：最近，de Lazaro等人研究了重要铁电材料Pb_（1-x）Ca_xTiO_3中不同x值下不同相的演变。 [物理Rev. B 75，144111（2007）]使用X射线衍射（XRD）和拉曼技术，得出了自相矛盾的结果（XRD的伪装和拉曼的非立方）。在de Lazaro等人的XRD数据中可以看到许多Bragg峰的“尾部”，这与Chandra和Pandey所观察到的相似。母校Res。 18，407（2003）]，但这并未包括在他们的分析中。我们详细的Rietveld分析表明，对于0.40≤x≤0.56，正交相（Pbnm）和四方相（PAmm）共存。我们还介绍了我们的拉曼数据，这些数据与de Lazaro等人的数据不同。但要在整个成分范围内遵循预期的顺序变化。

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《Physical review. B, Condensed Matter And Materials Physics》 |2008年第1期|p.017101.1-017101.3|共3页
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Amreesh Chandra;
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Comment on 'Pb_(1-x)Ca_xTiO_3 solid solution (x=0.0, 0.25, 0.50, and 0.75): A theoretical and experimental approach'

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