La9.33Si6O26基氧离子导电复合材料的制备与导电性

doi:10.3724/SP.J.1077.2011.01043

无机材料学报 ›› 2011, Vol. 26 ›› Issue (10): 1043-1048.DOI: 10.3724/SP.J.1077.2011.01043

La_9.33Si₆O₂₆基氧离子导电复合材料的制备与导电性

刘超峰, 张鸿, 夏俊霄, 李根, 李志成

(中南大学 1. 材料科学与工程学院; 2. 有色金属材料科学与工程教育部重点实验室, 长沙 410083)

收稿日期:2010-11-16 修回日期:2011-01-03 出版日期:2011-10-20 网络出版日期:2011-09-20
作者简介:刘超峰(1986-), 男, 硕士研究生. E-mail: chaofeng-liu6@163.com
基金资助:
国家自然科学基金(50872155)

Fabrication and Conductivity of La_9.33Si₆O₂₆-based Composite Oxygen-ionic Conductor

LIU Chao-Feng, ZHANG Hong, XIA Jun-Xiao, Li Gen, LI Zhi-Cheng

(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Key Laboratory of Non-ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China)

Received:2010-11-16 Revised:2011-01-03 Published:2011-10-20 Online:2011-09-20
Supported by:
National Natural Science Foundation of China (50872155)

摘要/Abstract

摘要： 采用改性共沉淀法合成了La_9.33Si₆O₂₆-10wt% Zr_0.86Y_0.14O_1.92两相共存的氧离子导电复合材料, 利用X射线衍射、扫描电子显微镜、交流阻抗技术分别表征了材料的相组成、微观组织和离子导电性. 结果表明, 复合材料粉体平均晶粒尺寸为35 nm, 烧结块体的平均颗粒尺寸为500 nm; 在300~700℃温度范围内, 复合材料的导电率均高于La_9.33Si₆O₂₆或Zr_0.86Y_0.14O_1.92单相材料, 且700℃时比La_9.33Si₆O₂₆高出1个数量级. 结合交流阻抗谱及电模量谱对复合材料的导电机理进行了分析讨论.

关键词: La_9.33Si₆O₂₆, Zr_0.86Y_0.14O_1.92, 复合材料, 共沉淀法, 离子导电性

Abstract: The oxygen-ionic conductor of La_9.33Si₆O₂₆-10wt% Zr_0.86Y_0.14O_1.92 composite material was prepared by using a modified co-precipitation method. X-ray diffraction, scanning electron microscope and complex impedance were adopted to investigate the phase component, microstructures and conductivities of the composite material, respectively. The results show that the average grain size of the as-calcined powder is 35 nm and the average particle size of the as-sintered composite ceramic is about 500 nm. The conductivities of the composite ceramic are higher than those of the single phase La_9.33Si₆O₂₆ and Zr_0.86Y_0.14O_1.92 ceramic at the temperatures from 300℃ to 700℃. The conductivity of the composite ceramic is one order in magnitude higher than that of polycrystalline La_9.33Si₆O₂₆ at 700℃. The conduction mechanism of the composite material is discussed by the analysis of impedance spectra and electric modulus spectra.

Key words: La_9.33Si₆O₂₆, Zr_0.86Y_0.14O_1.92, composite material, co-precipitation method, ionic conductivity

中图分类号:

TB332

刘超峰, 张鸿, 夏俊霄, 李根, 李志成. La_9.33Si₆O₂₆基氧离子导电复合材料的制备与导电性[J]. 无机材料学报, 2011, 26(10): 1043-1048.

LIU Chao-Feng, ZHANG Hong, XIA Jun-Xiao, Li Gen, LI Zhi-Cheng. Fabrication and Conductivity of La_9.33Si₆O₂₆-based Composite Oxygen-ionic Conductor[J]. Journal of Inorganic Materials, 2011, 26(10): 1043-1048.

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La_9.33Si₆O₂₆基氧离子导电复合材料的制备与导电性

Fabrication and Conductivity of La_9.33Si₆O₂₆-based Composite Oxygen-ionic Conductor

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