| 反铁电晶体PbTaO3的对称性和序参量 |
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| 引用本文： | 孙锐溢,韩代朝,张明,刘裕鹏.反铁电晶体PbTaO3的对称性和序参量[J].中国材料科技与设备,2009,6(1):49-50. |
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| 作者姓名： | 孙锐溢 韩代朝 张明 刘裕鹏 |
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| 作者单位： | [1]军械工程学院火炮工程系,河北石家庄050003 [2]军械工程学院基础部,河北石家庄050003 |
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| 摘 要： | 根据室温下X射线衍射结果，仔细研究了反铁电晶体PbTaOa的晶体结构。确定PbTaO3在973K发生顺电一反铁电相变，反铁电相对称性所属点群是P2／m（C2i）。用轴矢量R作为序参量来描述反铁电相便是对称性的变化，对于已得到的晶体相变前后的对称点群，应用居里原理，得到了理想结果。
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| 关 键 词： | 反铁电相 对称性 序参量 |
Symmetry and Order Parameter of AnTaferroelectric PbTaO3 |
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| SUN Rui-yi,HAN Dai-zhao,ZHANG Ming,LIU Yu-peng.Symmetry and Order Parameter of AnTaferroelectric PbTaO3[J].Chinese Materials Science Technology & Equipment,2009,6(1):49-50. |
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| Authors: | SUN Rui-yi HAN Dai-zhao ZHANG Ming LIU Yu-peng |
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| Affiliation: | 1. Department of Guns Engineering, Ordnance Engineering, Hebei , shijiazhuang ,050003,China ;2.Department of Basic Courses, Ordnance Engineering College, Hebei,Shijiazhuang, 050003, China) |
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| Abstract: | On the bases of the result of X-ray diffracTaon at room temperature, the structure of AnTaferroelectric PbTaO3 has been studied in detail. For the paraelectric-anTaferroelectric phase transiTaon at 873K, the symmetry of anTaferroelectric PbTaO3 is P2/m（C2i）. An axial vector R is selected as the order parameter to reflect the change of symmetry in anTaferroelectric phase transiTaon. According to Curie principle, the saTasfying results are obtained relaTave to the change of symmetry group in the phase transiTaon. |
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| Keywords: | AnTaferroelectric phase Symmetry Order parameter |
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