BiYbO_3固溶极限对BSPT压电陶瓷结构和电学性能的影响  

Effect of BiYbO_3 Solid Solution Limit on Electric Properties and Structure of BSPT Piezoceramics

作　　者：石维[1,2] 冷森林 龙禹[1] 朱建国[2] 肖定全[2] 

机构地区：[1]铜仁学院物理与电子科学系,铜仁554300 [2]四川大学材料科学与工程学院,成都610064

出　　处：《无机材料学报》2013年第6期623-628,共6页Journal of Inorganic Materials

基　　金：贵州省科技厅黔科合[2011(2031)];贵州省人事厅[TZJF2010041];铜仁学院博士启动基金[DS1001]~~

摘　　要：采用传统固相反应法制备了yBiYbO3-(0.36–y)BiScO3-0.64PbTiO3(BSYPT-0.64/y)体系压电陶瓷。X射线衍射显示BSYPT-0.64/y陶瓷体系为单一的钙钛矿结构;SEM测试结果显示当y=0.1时陶瓷表面形貌出现异常,当y=0.14时有大量粒径为0.3~0.5μm的细小晶粒析出在陶瓷的表面;EDS能谱分析发现细小晶粒主要成分为Bi、Yb、Ti、Sc和O,表明BiYbO3的含量超过10%时为BSYPT-0.64/y陶瓷体系的固溶极限区域;通过BSYPT-0.64/y陶瓷的压电性能、铁电性能测试,介温特性(Tc^450℃)结果分析发现当y>0.1时,BiYbO3固溶极限析出是相对孤立的行为,不是影响BSYPT-0.64/y的结构和电学性能的主要因素,而其结构和电学性能的降低依赖于Sc/Pb相对含量比的降低导致组分对准同型相界的偏离。yBiYbO3-（0.36-y）BiScO3-xPbTi03 （BSYPT-0.64/y） piezoelectric ceramics were prepared by traditional solid reaction method. The result of X-ray diffraction shows that the as-prepared BSYPT-0.64/y ceramics have single perovskite structure. However, scanning electron microscopy results show that the surface morphology of BSYPT-0.64/y ceramics becomes abnormal at y=0.1, and a large amount of tiny grains, with the grain size distributing from 0.3 μm to 0.5 μm, separate out on the surface of the ceramics at y=0.14. EDS analysis reveals that the major ingredients of these tiny grains are mainly Bi, Yb, Ti, Sc and O. The solid solution limit is therefore confirmed to be near y=0.1 for the BSYPT-0.64/y ceramics. By means of systematic piezoelectric, ferroelectric and temperature-dependent dielectric （Tc-450℃） characterizations, it is found that the occurrence of solid solubility limit-related BiYbO3 separation is not a key factor for affecting the electrical properties and structure of the ceramics, but a relatively isolated behavior. The degradation of structural and electrical properties is attributed to the decrease in Sc/Pb ratio when the BiYbO3 content is increased, which leads to a deviation from MPB in the BSYPT-0.64/y ceramics.

关 键 词：固溶极限 压电陶瓷 居里温度 铁电性能 

分 类 号：TB34[一般工业技术—材料科学与工程]