【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Bi₂Cu_0.1V_0.9O_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。更多还原

【Abstract】 Bi₂Cu_0.1V_0.9O_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.更多还原