Synthesis and Ionic Conduction of Cation-deficient Apatite La9.33-2x/3MxSi6O26 Doped with Mg,Ca,Sr

›› 2008, Vol. 16 ›› Issue (3): 488-491.

• SPECIAL ISSUE OF THE FIRST INTERNATIONAL SYMPOSIUM ON SUSTAINABLE CHEMICAL PRODUCT AND PROCESS ENGINEERING • Previous Articles Next Articles

Synthesis and Ionic Conduction of Cation-deficient Apatite La_9.33-2x/3M_xSi₆O₂₆ Doped with Mg,Ca,Sr

YUAN Wenhui¹, GU Yaping¹, LI Li²

1. Guangdong Key Laboratory of Green Chemicals, College of Chemical Engineering and Energy, South China University of Technology, Guangzhou 510640, China;
2. College of Environmental and Engineering, South China University of Technology, Guangzhou 510640, China

Received:2007-09-22 Revised:2008-04-04 Online:2008-06-28 Published:2008-06-28
Supported by:
Natural Science Foundation of Guangdong Province (06025657);Guangdong Provincial Green Chemicals

Synthesis and Ionic Conduction of Cation-deficient Apatite La_9.33-2x/3M_xSi₆O₂₆ Doped with Mg,Ca,Sr

袁文辉¹, 顾亚萍¹, 李莉²

1. Guangdong Key Laboratory of Green Chemicals, College of Chemical Engineering and Energy, South China University of Technology, Guangzhou 510640, China;
2. College of Environmental and Engineering, South China University of Technology, Guangzhou 510640, China

通讯作者: YUAN Wenhui,E-mail:cewhyuan@scut.edu.cn
基金资助:
Natural Science Foundation of Guangdong Province (06025657);Guangdong Provincial Green Chemicals

Abstract

Abstract: Apatite-type lanthanum silicate with special conduction mechanism via interstitial oxygen has attracted considerable interest in recent years. In this work, pure powder of La_9.33-2x/3M_xSi₆O₂₆ (M=Mg, Ca, Sr) is prepared by the sol-gel method with sintering at 1000℃. The powder is characterized by X-ray diffraction (XRD) and scanning electron micrograph (SEM). The apatite can be obtained at relatively low temperature as compared to the conventional solid-state reaction method. The measurements of conductivity of a series of doped samples La_9.33-2x/3M_xSi₆O₂₆ (M=Ca, Mg, Sr) indicate that the type of dopant and the amount have a significant effect on the conductivity. The greatest decrease in conductivity is observed for Mg doping, following the Ca and the Sr doped apatites. The effect is ultimately attributed to the amount of oxygen interstitials, which is affected by the crystal lattice distortion arising from cation vacancies.

Key words: sol-gel, dopant, cation vacancies, ionic conductivity, apatite

摘要： Apatite-type lanthanum silicate with special conduction mechanism via interstitial oxygen has attracted considerable interest in recent years. In this work, pure powder of La_9.33-2x/3M_xSi₆O₂₆ (M=Mg, Ca, Sr) is prepared by the sol-gel method with sintering at 1000℃. The powder is characterized by X-ray diffraction (XRD) and scanning electron micrograph (SEM). The apatite can be obtained at relatively low temperature as compared to the conventional solid-state reaction method. The measurements of conductivity of a series of doped samples La_9.33-2x/3M_xSi₆O₂₆ (M=Ca, Mg, Sr) indicate that the type of dopant and the amount have a significant effect on the conductivity. The greatest decrease in conductivity is observed for Mg doping, following the Ca and the Sr doped apatites. The effect is ultimately attributed to the amount of oxygen interstitials, which is affected by the crystal lattice distortion arising from cation vacancies.

关键词: sol-gel, dopant, cation vacancies, ionic conductivity, apatite

YUAN Wenhui, GU Yaping, LI Li. Synthesis and Ionic Conduction of Cation-deficient Apatite La_9.33-2x/3M_xSi₆O₂₆ Doped with Mg,Ca,Sr[J]. , 2008, 16(3): 488-491.

袁文辉, 顾亚萍, 李莉. Synthesis and Ionic Conduction of Cation-deficient Apatite La_9.33-2x/3M_xSi₆O₂₆ Doped with Mg,Ca,Sr[J]. , 2008, 16(3): 488-491.

References

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Synthesis and Ionic Conduction of Cation-deficient Apatite La_9.33-2x/3M_xSi₆O₂₆ Doped with Mg,Ca,Sr

Synthesis and Ionic Conduction of Cation-deficient Apatite La_9.33-2x/3M_xSi₆O₂₆ Doped with Mg,Ca,Sr

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