多铁性陶瓷BiFeO_3-PbTiO_3-BaTiO_3的介电、压电及其老化性能研究  

Dielectric,Piezoelectric and Aging Properties of Multiferroic Ceramics BiFeO_3-PbTiO_3-BaTiO_3

作　　者：宁海霞[1,2] 侯现博 于剑[1] 

机构地区：[1]同济大学,上海201804 [2]苏州市职业大学,江苏苏州215104

出　　处：《稀有金属材料与工程》2016年第5期1249-1252,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50875181)

摘　　要：采用高温固相法制备了钙钛矿结构的0.7BiFeO_3-0.2PbTiO_3-0.1BaTiO_3陶瓷,研究了该陶瓷的介电性能、压电性能及其老化性能。结果表明,该陶瓷是一种非常有潜力的高温压电陶瓷,其介电常数和介电损耗分别为390和0.015,铁电居里温度TC约为600℃,压电常数d_(33)约为100 pC/N,压电常数的时间稳定性和热稳定性好,热退极化温度Td约为500℃。压电常数热退极化机理主要为内在的剩余极化老化,辅以低浓度氧空位等外在缺陷对畴壁的钉扎作用。Multiferroic ceramics 0.7BiFeO3-0.2PbTiO3-0.1BaTiO3（BF-PT-BT） was prepared by a high temperature solid state method. The dielectric, piezoelectric properties and the aging behaviors of the ceramics were investigated. The results indicate that BF-PT-BT ceramics possesses excellent properties including the dielectric constant εr=390, tan δ=0.015, the piezoelectric coefficient of d（33 -100 pC/N, the Curie temperature of Tc-600 ℃, and good stability with the thermal depoling temperature of Td -500 ℃, which is a high potential lead-reduced high-temperature piezoceramics. The primary thermal depoling mechanism is the decrease of remnant polarization, associated with the pinning effect on domain walls of low density oxygen vacancy defects.

关 键 词：BiFeO3-PbTiO3-BaTiO3 高温压电陶瓷 老化 压电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]