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Crystal structure and ionic conductivity of Mg doped apatite-type lanthanum silicates La10Si6-xMgxO27-x (x= 0-0.4) |
| Guang-Chao(广超) Yin（尹）, Lin-Hong(林红) Zhong(仲),Mei-Ling(美玲) Sun(孙),俊凯 张,Xiao-Jun(晓君) Xie(谢),日东 丛,Wei GAO,Qi-Liang(啟良) Cui(崔) |
| State Key Laboratory of Superhard Materials |
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Abstract The lanthanum silicates La10Si6-xMgxO27-x (x= 0-0.4) have been prepared by solid state synthesis method 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 the significant enlargement of channel triangles, which is favorable for oxide-ion conduction. Furthermore, the increase of Mg amount significantly influences the linear density of interstitial oxygen, which plays an important role on ionic conductivity. The Arrhenius plots of La10Si6-xMgxO27-x (x= 0-0.4) suggest that Mg doped samples present higher conductivity and lower activation energy than non doped La10Si6O27, and La10Si5.8Mg0.2O26.8 exhibits the highest conductivity with a value of 3.0×10-2 S cm-1 at 700 °C. Such conductive behavior agrees well with the refined results. The corresponding mechanism has been discussed in this paper。
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Received: 09 August 2013
Published: 07 November 2013
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Corresponding Authors:
Wei GAO
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Cite this article:
Guang-Chao(广超) Yin（尹）, Lin-Hong(林红) Zhong(仲),Mei-Ling(美玲) Sun(孙),俊凯 张,Xiao-Jun(晓君) Xie(谢),日东 丛,Wei GAO,Qi-Liang(啟良) Cui(崔) Crystal structure and ionic conductivity of Mg doped apatite-type lanthanum silicates La10Si6-xMgxO27-x (x= 0-0.4) Chin. Phys. B 0
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