YSZ-SrTi_(0.6)Fe_(0.4)O_(3-δ)复相陶瓷材料的交流阻抗  

Impedance Behavior of YSZ-SrTi_(0.6)Fe_(0.4)O_(3-δ) Ceramic Composite

作　　者：单科[1,2] 翟凤瑞 李楠[1,2] 孙丽达 周鹏飞[1] 易中周 谢志鹏[3] 

机构地区：[1]红河学院理学院,云南蒙自661199 [2]云南省高校"地方特色资源利用与新材料"重点实验室,云南蒙自661199 [3]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《陶瓷学报》2017年第6期908-912,共5页Journal of Ceramics

基　　金：国家自然科学基金资助(51562009和51362011);云南省应用基础研究计划项目(016FB098)

摘　　要：采用溶胶-凝胶法制备Sr Ti_(0.6)Fe_(0.4)O_(3-δ),通过掺杂少量YSZ制备YSZ-Sr Ti_(0.6)Fe_(0.4)O_(3-δ)复相陶瓷。采用电化学工作站测试样品电子-离子混合传导及离子传导的阻抗谱和频谱特性,结果表明,YSZ-Sr Ti_(0.6)Fe_(0.4)O_(3-δ)在电子-离子混合传导过程中存在三种不同的极化过程,分别来自于晶粒,晶界和电极/样品,通过等效电路对阻抗谱的拟合,活化能分别为0.16 e V,0.62 e V和0.42 e V,随温度的升高,晶粒弛豫不明显,样品电阻主要由晶界的极化过程控制;在离子传导过程中,只存在一个晶界弛豫过程,晶界弛豫随温度的升高而减小,试样的弛豫时间为~0.13-0.29 s。YSZ-SrTi0.6Fe0.4O3-δ ceramic composite was synthetized by sol-gel method. Complex impedance and frequency spectra were investigated using an impedance analyzer. The result indicates that three polarization processes correspond to grain, grain boundary and sample/electrode, and the activation energies are 0.16, 0.62 and 0.42 eV respectively during the ion-electron mix-conduction. The resistances of mix-conduction and ion conduction are also predominantly influenced by grain boundary. The relaxation time of space charge polarization at grain boundary decreases with the rise in temperature and lies in the range-0.13-0.29 s during ion conduction process.

关 键 词：YSZ—SrTi0.6Fe0.4O3-δ 弛豫 阻抗谱 频谱 

分 类 号：TQ174.75[化学工程—陶瓷工业]