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

袁文辉; 顾亚萍; 李莉

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

Updated：2026-01-06

- Synthesis and Ionic Conduction of Cation-deficient Apatite La_9.33-2x/3M_xSi₆O₂₆ Doped with Mg,Ca,Sr
- Chinese Journal of Chemical Engineering Vol. 16, Issue 3, Pages: 488-491(2008)
- Affiliations：
  
  1. Guangdong Key Laboratory of Green Chemicals, College of Chemical Engineering and Energy, South China University of Technology,Guangzhou,China,510640
  2. College of Environmental and Engineering, South China University of Technology,Guangzhou,China,510640
- Author bio：
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- Published：2008
- Accepted：
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摘要

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/3

(M=Mg

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/3

(M=Ca

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.

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