| Ba0.7Sr0.3TiO3铁电薄膜的弥散相变特征及有序微畴 |
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| 引用本文： | 丁永平,孟中岩.Ba0.7Sr0.3TiO3铁电薄膜的弥散相变特征及有序微畴[J].材料研究学报,2000,14(3):315-317. |
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| 作者姓名： | 丁永平 孟中岩 |
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| 作者单位： | 1. 上海交通大学金属基复合材料国家重点实验室
2. 上海大学 |
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| 基金项目： | 国家自然科学基金;59572038; |
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| 摘 要： | Ｂａ０．７Ｓｒ０．３ＴｉＯ３铁电薄膜的介电温谱呈现弥散相变的特征，相对介电常数与温度呈现平方关系。ＴＥＭ观察表明，１０ｎｍ量级微畴随机分布在晶粒中，选区电子衍射（ＳＡＥＤ）揭示微畴区存在１／２{201}超点阵，Ｂａ＾２＋、Ｓｒ＾２＋离子层在「００１」方向的交替排列可以描述该超点阵。
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| 关 键 词： | Ba0.7Sr0.3TiO3 薄膜 弥散相变 有序微畴 铁电薄 |
| 文章编号： | 1005-3093(2000)03-0315-03 |
| 修稿时间： | 1999年5月7日 |
DIFFUSE PHASE TRANSITION AND ORDERED MICRO-DOMAIN IN Ba0.7Sr0.3TiO3 THIN FILMS |
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| DING Yongping,MENG Zhongyan.DIFFUSE PHASE TRANSITION AND ORDERED MICRO-DOMAIN IN Ba0.7Sr0.3TiO3 THIN FILMS[J].Chinese Journal of Materials Research,2000,14(3):315-317. |
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| Authors: | DING Yongping MENG Zhongyan |
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| Abstract: | It was found in experiments that the temperature dependence of the dielectric constant of Ba0.7Sr0.3TiO3 thin films fitted the quadratic law well above Curie temperature. The film had the character of diffuse phase transition (DPT). TEM pattern revealed that micro-domains (10nm or so) existed in some grains randomly. In addition. 1/2{201} ordering were found in the micro-domain region, which may be explained by alternative alignments of Ba2+ and Sr2+ cation layers along 001]direction. |
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| Keywords: | Ba_(0 7)Sr_(0 3)TiO_3 DPT ordered micro-domain TEM |
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