Bi_2Cu_(0.1)V_(0.9)O_(5.35-δ)氧离子导体的显微结构与氧离子导电性能  

Microstructure and Oxygen Ionic Conductivity of Bi_2Cu_(0.1)V_(0.9)O_(5.35-δ)

作　　者：余琪[1] 张枫 徐庆[1] 黄端平[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《现代技术陶瓷》2016年第3期205-211,共7页Advanced Ceramics

基　　金：国家自然科学基金(51572204);武汉市科技局国际合作项目(2014030709020315)

摘　　要：采用固相反应法和柠檬酸-EDTA法制备了具有单一Aurivillius结构的Bi_2Cu_(0.1)V_(0.9)O_(5.35-δ)陶瓷样品,采用扫描电镜研究了陶瓷样品的显微结构,采用交流阻抗谱法研究了陶瓷样品在升/降温循环过程中的氧离子导电性能。结果表明,陶瓷样品的显微结构对升/降温循环过程中的氧离子导电行为有显著的影响。与采用固相反应法制备的大晶粒陶瓷样品相比,采用柠檬酸-EDTA法制备的陶瓷样品具有晶粒细小均匀的显微结构,能够有效抑制在升/降温循环过程中陶瓷样品氧离子总电导率的热滞现象。Bi_2Cu_（0.1）V_（0.9）O_（5.35-δ） ceramics with a pure Aurivillius phase were produced by the conventional solid-state reaction method and a citrate-EDTA method, respectively. The microstructure of the ceramic specimens was checked by scanning electron microscopy（SEM） and the oxygen-ion conductivity in a heating/cooling cycle was inspected by alternating current（AC） impedance spectroscopy. The results indicate a significant role of the microstructure in determining the oxygen-ion conductivity in heating/cooling cycle. Compared with the coarse-grained specimens prepared by the solid-state reaction method, the ceramic specimens derived from the citrate-EDTA method showed a fine-grained microstructure and a fairly good consistence in oxygen-ion conductivity in heating/cooling cycle without a remarkable hysteresis.

关 键 词：Bi2Cu0.1V0.9O5.35-δ 显微结构 氧离子导电性能 热滞行为 

分 类 号：TB34[一般工业技术—材料科学与工程]