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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
