Polar order and diffuse scatter in Ba(Ti1-xZrx)O3 ceramics
Polar order and diffuse scatter in Ba(Ti1-xZrx)O3 ceramics
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DOI：
10.1063/1.3253735
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发表时间：
2009-12-01
影响因子：
3.2
通讯作者：
Reaney, I. M.
中科院分区：
文献类型：
--
作者：
Miao, S.;Pokorny, J.;Reaney, I. M.
通过结合 X 射线衍射、介电测量、拉曼光谱和电子衍射，对 x < 0.35 的 Ba(Ti1-xZrx)O-3 (BTZ) 体系进行了研究，以更好地了解极性顺序的结构和相关长度随成分和温度的变化。拉曼光谱的仔细拟合证实了在室温下 x=0.05 时正交相的稳定性，并且在 80 K 时存在混合相（正交和菱形）。拉曼数据表明菱形相最有可能在 x=0.15 和 0.25 的低温下存在，并且在 x=0.35 时仅产生短程极序。拉曼光谱的解释与作为成分和温度函数的介电数据基本一致。无论极序的结构和相关长度如何，所有组合物在高阶区轴电子衍射中室温下的漫散射保持基本相同。因此，认为漫射最大值与 BTZ 系统中极序的相关长度不直接相关，因此对介电行为没有贡献。
The Ba(Ti1-xZrx)O-3 (BTZ) system with x < 0.35 has been studied using a combination of x-ray diffraction, dielectric measurements, Raman spectroscopy, and electron diffraction with a view to better understand the changes in structure and correlation length of polar order as a function of composition and temperature. Careful fitting of Raman spectra has confirmed stabilization of the orthorhombic phase at room temperature in x=0.05 with mixed phase (orthorhombic and rhombohedral) present at 80 K. Raman data suggest that the rhombohedral phase is most likely to be present at low temperature for x=0.15 and 0.25 and that only short range polar order evolves in x=0.35. Interpretation of the Raman spectra is in broad agreement with the dielectric data as a function of composition and temperature. Diffuse scatter at room temperature in high order zone axis electron diffraction remains essentially identical for all compositions irrespective of structure and correlation length of polar order. The diffuse maxima are therefore considered not to relate directly to the correlation length of polar order in the BTZ system and therefore do not contribute to the dielectric behavior.