高温无铅压电陶瓷BFMT-BT的微结构与电性能  

Microstructure and electrical properties of high-temperature BFMT-BT Pb-free ceramics

作　　者：单旭[1] 周昌荣[1] 杨华斌[1] 周沁[1] 成钧[1] 陈国华[1] 李伟洲[2] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004 [2]广西大学材料科学与工程学院,广西南宁530004

出　　处：《中南大学学报（自然科学版）》2013年第4期1380-1384,共5页Journal of Central South University:Science and Technology

基　　金：广西自然科学基金重点资助项目(2010GXNSFD013007);广西自然科学基金资助项目(2010GXNSFB013010);广西教育厅重点项目(201012MS083);广西信息材料重点实验室资助项目(桂科能1110908-09-Z)

摘　　要：采用传统陶瓷制备方法,制备一种高温钙钛矿结构0.71BiFe1 x(Mg1/2Ti1/2)xO3-0.29BaTiO3(BFMTx-BT)无铅压电陶瓷。研究Bi(Mg1/2Ti1/2)O3(BMT)改性对该体系陶瓷微结构、介电、铁电与压电性能的影响。结果表明:在所研究的组成范围内BMT不改变陶瓷的晶体结构,居里温度随BMT含量的增加先保持不变,但随BMT的进一步增加明显降低,频率依赖性与弥散相变特征随BMT含量的增加更加明显。矫顽场随BMT含量的增加而降低,剩余极化在BMT含量x≤0.06时变化不大。添加BMT提高了陶瓷的压电常数d33,但使机电耦合系数降低。在BMT含量x=0.03时,BFMTx-BT具有优良的压电性能(d33为155 pC/N)与高居里温度(tc为420℃)。A high-temperature perovskite-type 0.71BiFel-x（Mgl/2Til/2）xO3-O.29BaTi03 （abbreviated as BFMTx-BT） lead-free piezoelectric ceramics was prepared by a conventional ceramic sintering technique. The effect of Bi （Mgl/2Til/2）O3（BMT） addition on microstructure, piezoelectric, dielectric and ferroelectric properties was investigated. The addition of BMT has no remarkable effect on the crystal structure within the studied doping content; however, an obvious decrease in Curie temperature took place. The characteristics of relaxor and diffuse phase transition were more obvious with the increase of BMT content. The coercive field Ec decreased with the increase of the amount of BMT and the remanent polarization Pr almost kept same values when x≤0.06. The piezoelectric constant d33 increased obviously and the electromechanical coupling factor kp decreased with BMT addition. The excellent piezoelectric properties of d33=155 pC/N and high Curie temperature of tc=420 ℃were obtained at x=0.03.

关 键 词：压电陶瓷 钙钛矿结构 弛豫特性 高温 

分 类 号：TM282[一般工业技术—材料科学与工程]