Studies on the relaxor behavior of sol-gel derived Ba(ZrxTi1−x)O3 (0.30≤x≤0.70) thin films
Studies on the relaxor behavior of sol-gel derived Ba(ZrxTi1−x)O3 (0.30≤x≤0.70) thin films
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DOI：
10.1007/978-0-387-38039-1_8
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发表时间：
2006
影响因子：
4.5
通讯作者：
A. Dixit;S. Majumder;R. Katiyar;A. Bhalla
中科院分区：
文献类型：
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作者：
A. Dixit;S. Majumder;R. Katiyar;A. Bhalla
我们研究了溶胶-凝胶法制备的Ba(ZrxTi1−x)O3（0.30≤x≤0.70）薄膜的弛豫行为。从介电数据和微拉曼光谱分析了弛豫行为的可能机理。在batio3晶格中Zr+4取代Ti+4降低了其长程极化顺序，产生了扩散的准电到铁电相变。固溶体系表现为富Ti+4极性区和富Zr+4极性区的混合物，随着Zr含量的增加，极性区的体积分数逐渐减小。在Zr含量为25.0时，极性区表现出典型的弛豫行为。松弛度随Zr含量的增加而增加，在掺Zr %时松弛度达到40.0。极性区域的频率依赖关系遵循Vogel-Fulcher关系，并具有在冻结温度（Tf）下的特征协同冻结。在Tf以下，通过极化滞后测量确定了长范围的极化有序
We have studied the relaxor behavior of sol-gel derived Ba(ZrxTi1−x)O3(0.30≤x≤0.70) thin films. The plausible mechanism of the relaxor behavior has been analyzed from the dielectric data and micro-Raman spectra. Substitution of Zr+4for Ti+4in BaTiO3lattice reduces its long-range polarization order yielding a diffused paraelectric to ferroelectric phase transition. The solid solution system is visualized as a mixture of Ti+4rich polar region and Zr+4rich regions and with the increase in Zr contents the volume fraction of the polar regions are progressively reduced. At about 25.0 at% Zr contents the polar regions exhibit typical relaxor behavior. The degree of relaxation increases with Zr content and maximizes at 40.0 at% Zr doped film. The frequency dependence of the polar regions follows Vogel-Fulcher relation with a characteristic cooperative freezing at freezing temperature (Tf). Below Tf, a long range polarization ordering was ascertained from the polarization hysteresis measurement