【作者】 张利文； 丁铁柱； 王强； 姜涛；

【Author】 ZHANG Li-wen DING Tie-zhu WANG Qiang JIANG Tao (Department of Physics,College of Sciences and Technology,Inner Mongolia University,Hohhot 010021,China)

【机构】 内蒙古大学理工学院物理系；

【摘要】 采用离子束溅射法在氧化钇稳定的氧化锆 （YSZ）和 SiO₂衬底上溅射 La_0．5Sr_0．5CoO_3-δ薄膜,测试了不同工艺制备的 La_0．5Sr_0．5CoO_3-δ薄膜样品的 XRD 谱和电导率．分析了薄膜表面微结构以及电学性能．结果表明：在 YSZ 衬底上生长的 La_0．5Sr_0．53CoO_3-δ薄膜随着热处理温度的升高取向增强,当薄膜经过750℃热处理后结晶度最好；各样品直流电导率在低温段的 Arrhenius 曲线近似为直线,表明材料的导电行为符合小极化子导电机制：交流电导率在低频段（＜100kHz）电导率主要是靠晶界导电贡献的,而在高频区（＞100kHz）,样品对交流电响应更加明显,电导率主要是靠晶粒导电贡献的。更多还原

【Abstract】 Thin films of La_0.5Sr_0.5CoO_3-δwere grown on yttria-stabilized zirconia（YSZ）single crystal and SiO₂ substrates by ion-beam sputtering method.The conductivity and the XRD spectra of specimen were measured.The surface microstructure and electrical properties were analyzed.The results show that the La_0.5Sr_0.5CoO_3-δfilms which on the YSZ have the tendency to strengthen in orientation with the rising of heat treatment temperature.When the heat treatment temperature reach 750℃,the crystalline grain is the biggest;The DC conductivity Arrhenius plots are approached to linearity,indicates the conductivity of specimen is consistent with the small polaron mechanism;The AC conductivity shows the switch over from grain-boundary process at low frequency to the bulk conduction process at high frequency, also the response of AC conductivity is more obviously at high frequency.更多还原