| Ba0.7Sr0.3TiO3及其含Pb弥散相铁电体介电性能的研究 |
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| 引用本文： | 王梦,贺建龙,杨卫明,李建军,王耘波,于军. Ba0.7Sr0.3TiO3及其含Pb弥散相铁电体介电性能的研究[J]. 功能材料, 2009, 40(11) |
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| 作者姓名： | 王梦 贺建龙 杨卫明 李建军 王耘波 于军 |
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| 作者单位： | 华中科技大学,电子科学与技术系,湖北,武汉,430074;华中科技大学,电子科学与技术系,湖北,武汉,430074;华中科技大学,电子科学与技术系,湖北,武汉,430074;华中科技大学,电子科学与技术系,湖北,武汉,430074;华中科技大学,电子科学与技术系,湖北,武汉,430074;华中科技大学,电子科学与技术系,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金面上项目，教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | 用固相反应法制备了Ba_(0.7)Sr_(0.3)TiO_3及其含Pb钛酸锶钡(BPST)陶瓷,运用修正的Smolenski的成分起伏理论和居里外斯定律,结合介电常数温度谱,研究了钙钛矿结构的BST及铅取代的钛酸锶铅钡(BPST)的弥散相,对其相变行为进行了分析,得出了的一些铁电模型参数.结果表明,该系列样品在弥散相变区的弥散指数α为1.29～1.88,相变区间为13.4～22.8℃;在顺电相其居里常量为1.25×10~5～1.47×10~5K数量级.当Pb含量为0.1(即Ba_(0.6)Pb_(0.1)TiO_3)时,居里峰较宽,弥散相明显,故具有较高的调谐温度稳定性.另外铅的加入提高了铁电体的相变温度,从44℃上升到175℃.
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| 关 键 词： | BPST 弥散相变 介电常数 温度稳定性 |
Dielectric properties of Ba_(0.7)Sr_(0.3)TiO_3 and Ba_(0.7-x)Pb_xSr_(0.3)TiO_3 ferroelectric ceramics with diffuse phase transition |
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| WANG Meng,HE Jian-long,YANG Wei-ming,LI Jian-jun,WANG Yun-bo,YU Jun. Dielectric properties of Ba_(0.7)Sr_(0.3)TiO_3 and Ba_(0.7-x)Pb_xSr_(0.3)TiO_3 ferroelectric ceramics with diffuse phase transition[J]. Journal of Functional Materials, 2009, 40(11) |
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| Authors: | WANG Meng HE Jian-long YANG Wei-ming LI Jian-jun WANG Yun-bo YU Jun |
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| Affiliation: | WANG Meng,HE Jian-long,YANG Wei-ming,LI Jian-jun,WANG Yun-bo,YU Jun(Department of Electronic Science and Technology,Huazhong University of Science and Technology,Wuhan 430074,China) |
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| Abstract: | B_(0.7)Sr_(0.3)TiO_3(BST) and Ba_(0.7-x)Pb_xSr_(0.3)TiO_3CBPST) ceramics derived from different amount of initial PbO excess were prepared by conventional solid-state method. Both permittivity and dielectric loss of all samples were measured in a temperature range. The substitution of Pb for Ba in BST system has revealed to raise the Curie temperature from 44-175'C ,and exhibited a diffused phase transition(DPT), expecially for the ceramic Ba_(0.5) Pb_(0.1) TiO_3 which can improve the temperature stability of tunability for phase shifter than others. Moreover,some ferroelectric model parameters were calculated to interpret the DPT by adopting Smolenski' s theory and Curie-Wise law. For example,values of diffuseness exponent a,Curie constant and transition region have varied from 1.29-1. 88,from 1. 25×10~5-1. 47×10~5K,and from 13.4-22. 8℃,respectively. |
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| Keywords: | BPST diffused phase transition BPST ceramic permittivity temperature stability |
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