| Evolution from Diffuse Ferroelectric to Relaxor Ferroelectric in Pb1-xBax（Fe1/2Nb1/2）O3 Solid Solutions |
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| 作者姓名： | 吕欣 王楠 陈湘明 |
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| 作者单位： | Laboratory of Dielectric Materials, Department of Materials Science and Engineering Zhejiang University, Hangzhou 310027 |
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| 基金项目： | Supported by the National Natural Science Foundation of Chins under Grant No 51332006, and the National Basic Research Program of China under Grant No 2009CB929503. |
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| 摘 要： | Dielectric and ferroelectric characteristics for Pb1-xBax（Fe1/2Nh/2）O3 （x = 0,0.05,0.1,0.15, and 0.2） ceramics are determined together with their structures. X-ray diffraction （XRD） analysis confirms the solid solutions with the cubic structure. The dielectric nature changes from diffuse ferroelectric to relaxor ferroelectric with increasing x, while the phase transition temperature Tc （or Tm） decreases monotonously. The diffuse ferroelectric phase transition is observed in the solid solutions with 0≤x ≤0.05. For Pbl-xBax（Fe1/2Nb1/2）O3 with 0.1≤ x≤0.2, relaxor ferroelectric behavior is determined, and the Vogel-Fulcher equation is used to describe the relaxor behavior. The 1/ε versus T plots reveal the diffusion dielectric characteristics in both diffuse and relaxor ferroelectrics.
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| 关 键 词： | 弛豫铁电体 O3 固溶体 进化 立方结构 介质特性 X射线衍射 铁电特性 |
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