| 钛酸锶(SrTiO3)低温时的自发极化 |
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| 引用本文： | 蔡玉平,韩代朝,宁如云. 钛酸锶(SrTiO3)低温时的自发极化[J]. 人工晶体学报, 2005, 34(3): 542-545 |
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| 作者姓名： | 蔡玉平 韩代朝 宁如云 |
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| 作者单位： | 军械工程学院基础部,石家庄,050003;军械工程学院基础部,石家庄,050003;军械工程学院基础部,石家庄,050003 |
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| 基金项目： | 军械工程学院院基金项目(YJJXM03010)资助 |
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| 摘 要： | 对自由能取极小可得到一系列方程,原则上可以确定任意系统相变时的行为.在105K SrTiO3发生立方一四方的反铁畸变,考虑量子效应,从吉布斯自由能形式出发,计算了介电常数,并讨论低温时的居里一外斯行为.
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| 关 键 词： | 钛酸锶 自发极化 介电常数 自由能 |
| 文章编号： | 1000-985X(2005)03-0542-04 |
Spontaneous Polarization of SrTiO3 at Low Temperature |
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| CAI Yu-ping,HAN Dai-zhao,NING Ru-yun. Spontaneous Polarization of SrTiO3 at Low Temperature[J]. Journal of Synthetic Crystals, 2005, 34(3): 542-545 |
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| Authors: | CAI Yu-ping HAN Dai-zhao NING Ru-yun |
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| Abstract: | Minimizing the Gibbs free energy with respect to order parameter leads to a set of equations which do, in principle, describe the behavior of any system undergoing a phase transition. The SrTiO_3 crystal transforms from cubic to tetragonal at temperature 105K. To take account of quantum effects, the permittivity of SrTiO_3 was calculated from Gibbs free energy, and the Curie Weiss-type behavior was analyzed at low temperature. |
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| Keywords: | SrTiO_3 spontaneous polarization permittivity free energy |
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