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.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
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]~~
关键词
固溶极限
压电陶瓷
居里温度
铁电性能
solid solution limit
piezoelectric ceramics
Curie temperature
ferroelectric properties
