相界法制备铁酸钴/锆钛酸铅镧0-3复合陶瓷  

Fabrication of the Cobalt Ferrite/Lead Lanthanum Zirconate Titanate 0-3 Composite Ceramics Via Phase Boundary

作　　者：杨青松[1] 李坤[1] 施瑕玉 耿志明[1] 

机构地区：[1]常州大学材料学院,江苏常州213164

出　　处：《压电与声光》2014年第4期612-616,共5页Piezoelectrics & Acoustooptics

摘　　要：通过溶胶-凝胶工艺在铁磁相CoFe2O4(CFO)陶瓷粉体表面包覆二氧化锆,形成核壳薄层。添加钨锌酸铅-钨铜酸铅(PZW-PCW)低熔点辅助剂以降低铁电相锆钛酸铅镧(PLZT)的烧结温度。采用CFO和PLZT[Pb1-1.5yLay(Zr0.58Ti0.42)1-1.25zNbzO3,y=0.06,z=0.02]粉体混合共烧工艺制备CFO/PLZT 0-3复合多铁性材料。研究了铁磁相含量、陶瓷的晶相结构、微观形貌及烧结工艺条件对陶瓷介电、压电、铁电性能的影响。XRD、SEM分析表明,二氧化锆在高温烧结过程中可有效阻挡铁、钴离子扩散进入PLZT相;同时相对较低温度烧结使PLZT钙钛矿相和CFO尖晶石相稳定共存。当磁场强度为334.23A/m,频率为229kHz时,1 050℃烧结的复合陶瓷(CFO质量分数为0.20)的磁电转换系数约为401mV/A。The cobalt ferrite （CFO） powders were coated with zirconia via Sol-Gel methods to form core-shell thin film. The Pb（Zn0.5 W0.5 ）O3-Pb（Cu0.5 W0.3 ）O3 （PZW-PCW） was used as additives to low down the sintering temperature of the lead lanthanum zirconate titanate （PLZT） ceramics. The CFO/PLZT 0-3 composite ceramics were fabricated from the mixture of the coated CFO and PLZT ceramic powder by using co-firing processes. The effects of the CFO content, phase structure, micro morphology and sintering conditions on the dielectric, piezoelectric and ferroelectric properties were investigated. The X-ray and SEM diffraction results show that the ZrO2 layer can buffer the Fe3＋ and Co2＋ ions diffusing from CFO to PLZT during the sintering process. The composites presented the perovskite structure（PLZT） and the spinel structure（CFO） after relatively lower temperature sintering. The magneto-electric coefficient of composite ceramics（CFO weight fraction x= 0.2） which were sintered at 1 050 ℃ was found to be 401 mV/A at the magnetic field intensity of 334.23 A/m and frequency of 229 kHz.

关 键 词：溶胶-凝胶法 球壳薄层 复合陶瓷 磁电效应 磁电耦合 

分 类 号：TN384[电子电信—物理电子学] TB34[一般工业技术—材料科学与工程]