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无机材料学报

无机材料学报 ›› 2014, Vol. 29 ›› Issue (1): 43-46.DOI: 10.3724/SP.J.1077.2014.12750 CSTR: 32189.14.SP.J.1077.2014.12750

• 研究论文 • 上一篇    下一篇

铌钽酸钠钾锂-铟酸铋铁电压电性能的研究

褚 涛, 艾辽东, 龙西法   

  1. (中国科学院 福建物质结构研究所 晶体材料研究室, 福州 350002)
  • 收稿日期:2012-12-12 修回日期:2013-04-03 出版日期:2014-01-20 网络出版日期:2013-12-09
  • 作者简介:褚 涛(1986-), 男, 硕士研究生. E-mail: chutao123@fjirsm.ac.cn
  • 基金资助:

    国家自然科学基金(91122020)

Preparation and Characterization on Piezo-/Ferro-electric Properties of (1-x)(KNN+LT)+xBI Ceramics

CHU Tao, AI Liao-Dong, LONG Xi-Fa   

  1. (Key Laboratory of Optoelectric Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China)
  • Received:2012-12-12 Revised:2013-04-03 Published:2014-01-20 Online:2013-12-09
  • About author:CHU Tao. E-mail: chutao123@fjirsm.ac.cn
  • Supported by:

    National Natural Science Foundation of China (91122020)

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摘要： 采用传统固相合成法制备了(1-x)(0.97Na0.5K0.5NbO3+0.03LiTaO3)+xBiInO3[(1-x)(KNN+LT)+xBI]无铅压电陶瓷, 研究了该体系的晶体结构、压电、铁电与介电性能。结果表明: (1-x)(KNN+LT)+xBI陶瓷的晶体结构在室温下为正交相和四方相两相共存, 随着BI含量的增加, 四方相含量逐渐增多, 居里温度Tc降低, 但是正交四方相转变温度To-t呈现升高趋势, 晶格参数逐渐增大。随着BI含量的继续增加, Bi在高温下的挥发导致氧空位的增多, 从而使材料性能下降。在x=0.0015时得到组分的最佳性能, 其居里温度Tc、相转变温度To-t、压电常数d33、剩余极化Pr、矫顽场Ec分别达到400℃、126℃、160 pC/N、19.26 μC/cm2和7.75 kV/cm。

关键词: KNN基陶瓷, 压电性能, 相转变, 铁电性能

Abstract: Lead free ferroelectric ceramics, (1-x)(0.97Na0.5K0.5NbO3+0.03LiTaO3)+xBiInO3[(1-x)(KNN+LT)+xBI]  ternary solid solution system were prepared by conventional solid state reaction method. The polycrystal structure, dielectric and piezo-/ferro-electric properties were systematically characterized. The results show that the (1- x)(KNN+LT)+ xBI ceramics present pure perovskite structure in which the orthorhombic and tetragonal phases coexist at room temperature. With increasing of BI content, the tetragonal phase and the lattice parameter increase gradually and the Curie temperature Tc decreases, while the phase transition temperature To-t from orthorhombic to tetragonal phase increases. With more BI addition, the electric properties decrease with the appearance of oxygen vacancy due to Bi loss at high temperature. The optimal properties are achieved in the (1-x)(KNN+LT)+ xBI ceramics (x=0.0015) with the Curie temperature Tc= 400℃, phase transition temperature To-t =126℃, piezoelectric constant d33 =160 pC/N, remnant polarization Pr=19.26 μC/cm2 and coercive field Ec =7.75 kV/cm.

Key words: KNN-based ceramics, piezoelectric properties, phase transition, ferroelectric properties

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