| 掺杂的阳离子缺陷型磷灰石 La9.33－2x/3MxSi6O26 (M=Mg,Sr,Ca)的合成及离子导电特性 |
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| 引用本文： | 袁文辉,顾亚萍,李莉.掺杂的阳离子缺陷型磷灰石 La9.33－2x/3MxSi6O26 (M=Mg,Sr,Ca)的合成及离子导电特性[J].中国化学工程学报,2008,16(3):488-491. |
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| 作者姓名： | 袁文辉 顾亚萍 李莉 |
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| 作者单位： | 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 |
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| 基金项目： | Natural Science Foundation of Guangdong Province (06025657);Guangdong Provincial Green Chemicals |
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| 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 La9.33－2x/3MxSi6O26 (M＝Mg, Ca, Sr) is prepared by the sol-gel method with sintering at 1000°C. The powder is characterized by X-ray diffraction (XRD) and scan-ning electron micrograph (SEM). The apatite can be obtained at relatively low temperature as compared to the con-ventional solid-state reaction method. The measurements of conductivity of a series of doped samples La9.33－2x/3MxSi6O26 (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 lat-tice distortion arising from cation vacancies.
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| 关 键 词： | sol-gel dopant cation vacancies ionic conductivity apatite |
| 收稿时间： | 22 September 2007 |
| 修稿时间： | 2008-4-4
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Synthesis and ionic conduction of cation-deficient apatite La9.33−2x/3MxSi6O26 doped with Mg, Ca, Sr |
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| YUAN Wenhui,GU Yaping,LI Li.Synthesis and ionic conduction of cation-deficient apatite La9.33−2x/3MxSi6O26 doped with Mg, Ca, Sr[J].Chinese Journal of Chemical Engineering,2008,16(3):488-491. |
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| Authors: | YUAN Wenhui GU Yaping LI Li |
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| Affiliation: | 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 |
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| 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 La9.33–2x/3MxSi6O26 (M=Mg, Ca, Sr) is prepared by the sol-gel method with sintering at 1000°C. 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 La9.33–2x/3MxSi6O26 (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. |
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| Keywords: | sol-gel dopant cation vacancies ionic conductivity apatite |
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