Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates La10Si6-xMgxO27-x(x=0-0.4

doi:10.1088/1674-1056/23/4/048202

中国物理B ›› 2014, Vol. 23 ›› Issue (4): 48202-048202.doi: 10.1088/1674-1056/23/4/048202

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates La₁₀Si_6-xMg_xO_27-x(x=0-0.4

尹广超, 殷红, 仲林红, 孙美玲, 张俊凯, 谢晓君, 丛日东, 王欣, 高伟, 崔啟良

State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

收稿日期:2013-08-08 修回日期:2013-10-22 出版日期:2014-04-15 发布日期:2014-04-15
基金资助:
Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.

Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates La₁₀Si_6-xMg_xO_27-x(x=0-0.4

State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

Received:2013-08-08 Revised:2013-10-22 Online:2014-04-15 Published:2014-04-15
Contact: Gao Wei E-mail:gwei@jlu.edu.cn
About author:82.47.Ed; 82.45.Gj; 66.30.Dn
Supported by:
Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.

摘要/Abstract

摘要： Lanthanum silicates La₁₀Si_6-xMg_xO_27-x (x= 0-0.4) were prepared by solid state synthesis to investigate the effect of Mg doping on crystal structure and ionic conductivity. Rietveld analysis of the powder XRD patterns reveals that Mg substitution on Si site results in significant enlargement of channel triangles, favoring oxide-ion conduction. Furthermore, an increase of Mg concentration significantly influences the linear density of interstitial oxygen, which plays an important role in ionic conductivity. The Arrhenius plots of La₁₀Si_6-xMg_xO_27-x (x=0-0.4) suggest that Mg-doped samples present higher conductivity and lower activation energy than non-doped La₁₀Si₆O₂₇, and La₁₀Si_5.8Mg_0.2O_26.8 exhibits the highest conductivity with a value of 3.0× 10^-2 S ·cm^-1 at 700 ℃. Such conductive behavior agrees well with the refined results. The corresponding mechanism has been discussed in this paper.

关键词: solid oxide fuel cells, electrolyte, ionic conduction

Abstract: Lanthanum silicates La₁₀Si_6-xMg_xO_27-x (x= 0-0.4) were prepared by solid state synthesis to investigate the effect of Mg doping on crystal structure and ionic conductivity. Rietveld analysis of the powder XRD patterns reveals that Mg substitution on Si site results in significant enlargement of channel triangles, favoring oxide-ion conduction. Furthermore, an increase of Mg concentration significantly influences the linear density of interstitial oxygen, which plays an important role in ionic conductivity. The Arrhenius plots of La₁₀Si_6-xMg_xO_27-x (x=0-0.4) suggest that Mg-doped samples present higher conductivity and lower activation energy than non-doped La₁₀Si₆O₂₇, and La₁₀Si_5.8Mg_0.2O_26.8 exhibits the highest conductivity with a value of 3.0× 10^-2 S ·cm^-1 at 700 ℃. Such conductive behavior agrees well with the refined results. The corresponding mechanism has been discussed in this paper.

Key words: solid oxide fuel cells, electrolyte, ionic conduction

中图分类号: (Solid-oxide fuel cells (SOFC))

82.47.Ed

82.45.Gj (Electrolytes) 66.30.Dn (Theory of diffusion and ionic conduction in solids)

尹广超, 殷红, 仲林红, 孙美玲, 张俊凯, 谢晓君, 丛日东, 王欣, 高伟, 崔啟良. Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates La₁₀Si_6-xMg_xO_27-x(x=0-0.4[J]. 中国物理B, 2014, 23(4): 48202-048202.

Yin Guang-Chao (尹广超), Yin Hong (殷红), Zhong Lin-Hong (仲林红), Sun Mei-Ling (孙美玲), Zhang Jun-Kai (张俊凯), Xie Xiao-Jun (谢晓君), Cong Ri-Dong (丛日东), Wang Xin (王欣), Gao Wei (高伟), Cui Qi-Liang (崔啟良). Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates La₁₀Si_6-xMg_xO_27-x(x=0-0.4[J]. Chin. Phys. B, 2014, 23(4): 48202-048202.

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Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates La₁₀Si_6-xMg_xO_27-x(x=0-0.4

Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates La₁₀Si_6-xMg_xO_27-x(x=0-0.4

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