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

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.

Keywords: solid oxide fuel cells electrolyte ionic conduction

Received: 08 August 2013
Revised: 22 October 2013
Accepted manuscript online:

PACS:	82.47.Ed	(Solid-oxide fuel cells (SOFC))
	82.45.Gj	(Electrolytes)
	66.30.Dn	(Theory of diffusion and ionic conduction in solids)

Fund: Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.

Corresponding Authors: Gao Wei
E-mail: gwei@jlu.edu.cn

About author: 82.47.Ed; 82.45.Gj; 66.30.Dn

Cite this article:

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 2014 Chin. Phys. B 23 048202

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

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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