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Bi_2V_(0.9)Cu_(0.1)O_(5.35-δ)陶瓷的烧结导电性及相变研究

Sintering,Oxygen Ionic Conducting Properties and Phase Transition for Bi_2V_(0.9)Cu_(0.1)O_(5.35-δ)
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摘要 采用EDTA-柠檬酸盐法制备出具有单一Aurivillius结构的Bi2V0.9Cu0.1O5.35-δ陶瓷。用扫描电镜、交流阻抗谱法、差热分析等方法研究了陶瓷样品的显微结构、氧离子导电性能及相变行为。结果表明:陶瓷样品的显微结构对Bi2V0.9Cu0.1O5.35-δ的氧离子导电性能有明显的影响。晶粒细小均匀的显微结构有效降低了Bi2V0.9Cu0.1O5.35-δ陶瓷在升降温过程中氧离子电导率的热滞程度。Bi2Cu0.1V0.9O5.35-δ陶瓷氧离子电导率Arrhenius关系曲线中,高温段和低温段导电活化能的差异是有序-无序相变引起的。 Bi2V0.9Cu0.1O5.35-δ ceramics with a pure Aurivillius phase were produced by a sol-gel method using EDTA and citric acid as mixed complexing agents. The microstructure, oxygen ionic conductivity and transformation procedure of the ceramic specimens were examined by scanning electron microscope, differential scanning calorimetry and alternating current （AC） impedance spectroscopy, respectively. The results revealed that the oxygen ionic conductivity strongly depends on its microstructure. It was found that a fine-grain microstructure served to suppress the hysteresis in ionic conductivity during heating/ cooling cycle. The difference between the activation energies for the ionic conducting in low and high temperature regions was interpreted in terms of an order-disorder phase transition.
作者 张枫 徐庆 黄端平 陈文 刘韩星 周建
机构地区 武汉理工大学材料科学与工程学院
出处 《武汉理工大学学报》 EI CAS CSCD 北大核心 2007年第10期80-82,共3页 Journal of Wuhan University of Technology
基金 教育部新世纪优秀人才支持计划(NECT-04-0724.) 教育部留学回国人员科研启动基金(2004-527) 湖北省自然科学基金创新群体项目(2005ABC004)
关键词 Bi2V0.9Cu0.1O5.35-δ 烧结 氧离子导电性能 相变 Bi2V0.9Cu0.1O5.35-δ sintering oxygen ionic conductivity phase transition
分类号 TQ174 [化学工程—陶瓷工业]
  • 相关文献

参考文献13

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二级参考文献20

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武汉理工大学学报
2007年 第10期

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