Ionic conduction in Zn²⁺-doped ZrP₂O₇ ceramics at intermediate temperatures

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• 作者：Hongmin Zhang ; Jia Xiao ; Zhijie Yang ; Hongtao Wang ; Guilin Ma ; ^{32uumagl@suda.edu.cn} ; Zhufa Zhou
• 关键词：Zirconium pyrophosphate ; Ionic conduction ; Conductivity ; Isotope effect ; Gas concentration cell
• 刊名：Solid State Ionics
• 出版年：2012
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：22 June, 2012
• 卷：218
• 期：Complete
• 页码：1-6
• 文件大小：733 K

摘要

A novel series of Zr_{1 鈭?#xA0;x}Zn_xP₂O₇ (x = 0.00, 0.03, 0.06, 0.1) was prepared by a solid state reaction method. XRD patterns indicated that all the samples exhibited a single cubic phase structure except Zr_0.9Zn_0.1P₂O₇. The conduction behavior was investigated using various electrochemical methods including ac impedance spectroscopy, isotope effect, gas concentration cells etc. in the temperature range of 300-600 掳C. The conductivities were affected by the doping levels, and increased in the order: 蟽 (x = 0.00) < 蟽 (x = 0.03) < 蟽 (x = 0.1) < 蟽 (x = 0.06). Zr_0.94Zn_0.06P₂O₇ exhibited the highest conductivities of 1.85 脳 10^鈭?#xA0;4 S路cm^鈭?#xA0;1 in wet hydrogen and 1.02 脳 10^鈭?#xA0;4 S路cm^鈭?#xA0;1 in dry air at 600 掳C. Isotope effect confirmed the proton conduction of the samples under water vapor-containing atmosphere. It was found that the ceramic samples were mixed conductors of oxide ionic and electron hole in dry oxygen-containing atmosphere. Whereas the ceramic samples were almost pure ionic conductors, and the ionic conduction was mainly contributed to proton and partially to oxide ionic in wet hydrogen atmosphere.