摘要
采用传统固相反应法制备无铅压电陶瓷材料(0.944-x)Na0.5Bi0.5TiO3-0.056BaTiO3-100xSrTiO3(BNT-BT-100xST)。研究材料的相结构、介电、铁电及压电性能。结果表明:在研究的组成范围内,陶瓷材料均能形成纯钙钛矿固溶体;当ST摩尔掺量为0.03≤x≤0.04时,该体系陶瓷具有三方-四方准同型相界结构;随着ST掺量增加,晶粒细化,低温介电反常峰θd和高温介电反常峰θm向低温端移动,材料的弥散程度增强。系列陶瓷压电性能较佳:x=0.03时,压电常数d33达最大值,为150pC/N;x=0.04时,材料性能较优,相对介电常数εr=4632,介电损耗tanδ=0.01576,剩余极化强度Pr=35μC/cm2,矫顽场Ec=21 kV/cm,d33=134 pC/N。ST组分的引入进一步优化BNT-BT体系的介电、铁电与压电特性,并探讨铁电-反铁电相变的弛豫特性与作用机制。
Lead-free piezoelectric ceramics （0.944-x）Na0.5Bi0.5TiO3-0.056BaTiO3-100xSrTiO3（BNT-BT-100xST） were fabricated via conventional ceramic fabrication technique. Crystal structure, dielectric, ferroelectric, and piezoelectric properties of the ceramics were investigated. Results indicate that the ceramics form a pure perovskite structure; a morphotropic phase boundary between the rhombohedral and tetragonal phases was identified in the composition range of 0.03≤x≤0.04, and the grain size decreases with the increase of ST content. The low temperature dielectric anomalous peak θ d and the high temperature dielectric anomalous peak θ m shift towards a lower temperature. The degree of dispersion increases. The fabricated series ceramics exhibit good piezoelectric performance： the piezoelectric constant reaches 150 pC/N at x=0.03. When x=0.04, the ceramics also exhibit excellent properties： relative dielectric constant εr=4 632, dielectric loss tan δ=0.015 76, remnant polarization Pr=35μC/cm2 , and coercive field E c=21 kV/cm, d33=134 pC/N. The dielectric, ferroelectric, and piezoelectric properties of the BNT–BT system are further improved with the intro- duction of the ST component. The relaxation characteristics and mechanism of the ferroelectric-antiferroelectric phase transition of series ceramics were discussed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2011年第12期1941-1946,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51072162)
陕西省工业攻关(2010-K09-18)资助项目
关键词
钛酸铋钠基
铁电性能
压电性能
sodium bismuth titanate based
ferroelectric property
piezoelectric property
作者简介
第一作者：穆文芳（1984-），女，硕士研究生。
通信作者：杜慧玲（1972-），女，博士，教授。
