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| Dielectric Properties of Fine-Grained BaTiO3 Ceramics under High Pressure | |
| 引用本文： | 朱金龙 肖长江 迟振华 冯少敏 李凤英 靳常青 邓湘云 王晓慧 李龙土 戴中华 王军 徐卓. Dielectric Properties of Fine-Grained BaTiO3 Ceramics under High Pressure[J]. 中国物理快报, 2006, 23(6): 1631-1633 |
| 作者姓名： | 朱金龙 肖长江 迟振华 冯少敏 李凤英 靳常青 邓湘云 王晓慧 李龙土 戴中华 王军 徐卓 |
| 作者单位： | [1]Institute of Physics, Chinese Academy of Sciences, Beijing 100080 [2]Department of Materials Sciences, Tsinghua University, Beijing 100084 [3]Laboratory for Electronic Ceramics, Xi＇an Jiaotong University, Xi＇an 710049 |
| 基金项目： | Supported by the National Key Basic Research and Development Programme of China under Grant No 2002CB613301, and the National Natural Science Foundation of China under Grant Nos 50332020 and 90401003. |
| 摘 要： | We investigate the temperature dependence of the dielectric constant of BaTiO3 ceramic with coarse to nanograin size under different hydrostatic high pressures up to 5000 bar in the range between room temperature and 200℃. The ferroelectric-to-paraelectric phase transition temperatures Tc are determined from the peak of dielectric constant versus temperature. The values of average grain-size are estimated from the SEM images. It is found that the magnitude of dTc/dp varies considerably from sample to sample depending on grain size. The Curie point Tc of the sample with small grain size decreases more sharply than that of samples with larger one. |
| 关 键 词： | 电介质 高压 BaTiO3陶器 纳米晶粒 流体静力学 铁电性 |
| 收稿时间： | 2006-02-20 |
| 修稿时间： | 2006-02-20 |
Dielectric Properties of Fine-Grained BaTiO3 Ceramics under High Pressure |
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| ZHU Jin-Long,XIAO Chang-Jiang,CHI Zhen-Hua,FENG Shao-Min,LI Feng-Ying,JIN Chang-Qing,DENG Xiang-Yun,WANG Xiao-Hui,LI Long-Tu,DAI Zhong-Hua,WANG Jun,XU Zhuo. Dielectric Properties of Fine-Grained BaTiO3 Ceramics under High Pressure[J]. Chinese Physics Letters, 2006, 23(6): 1631-1633 | |
| Authors: | ZHU Jin-Long XIAO Chang-Jiang CHI Zhen-Hua FENG Shao-Min LI Feng-Ying JIN Chang-Qing DENG Xiang-Yun WANG Xiao-Hui LI Long-Tu DAI Zhong-Hua WANG Jun XU Zhuo |
| Abstract: | We investigate the temperature dependence of the dielectric constant of BaTiO3 ceramic with coarse to nano-grain size under different hydrostatic high pressures up to 5000bar in the range between room temperature and 200°C. The ferroelectric-to-paraelectric phase transition temperatures Tc are determined from the peak of dielectric constant versus temperature. The values of average grain-size are estimated from the SEM images. It is found that the magnitude of dTc/dp varies considerably from sample to sample depending on grain size. The Curie point Tc of the sample with small grain size decreases more sharply than that of samples with larger one. |
| Keywords: | 81.07.Bc 77.80.-e 74.62.Fj |
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