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[1]袁 洋,黄志良*,孙建强.Mg2+掺杂磷灰石型硅酸镧固体电解质的制备及其电化学性能研究[J].武汉工程大学学报,2026,48(03):302-308.[doi:10.19843/j.cnki.CN42-1779/TQ.202603011]
　YUAN Yang,HUANG Zhiliang*,SUN Jianqiang.Preparation and electrochemical properties of Mg2+-doped apatite-type lanthanum silicate solid electrolyte[J].Journal of Wuhan Institute of Technology,2026,48(03):302-308.[doi:10.19843/j.cnki.CN42-1779/TQ.202603011]
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Mg2+掺杂磷灰石型硅酸镧固体电解质的制备及其电化学性能研究
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《武汉工程大学学报》[ISSN:1674-2869/CN:42-1779/TQ]

卷:
48
期数:
2026年03期
页码:
302-308
栏目:
现代大化工
出版日期:
2026-06-30

文章信息/Info

Title:
Preparation and electrochemical properties of Mg2+-doped apatite-type
lanthanum silicate solid electrolyte
文章编号:
1674 - 2869（2026）03 - 0302 - 07
作者:
袁 洋; 黄志良*; 孙建强
武汉工程大学材料科学与工程学院，湖北 武汉 430205
Author(s):
YUAN Yang; HUANG Zhiliang*; SUN Jianqiang
School of Materials Science and Engineering，Wuhan Institute of Technology，Wuhan 430205，China
关键词:
固体电解质; 硅酸镧; 磷灰石型结构; Mg2+掺杂; 电导率
Keywords:
solid electrolyte; lanthanum silicate; apatite-type structure; Mg2+ doping; conductivity
分类号:
O646
DOI:
10.19843/j.cnki.CN42-1779/TQ.202603011
文献标志码:
A
摘要:
为探究Mg2+掺杂对磷灰石型硅酸镧（La9.33Si6O26，LSO）的物相结构、成分价态、微观形貌以及电化学性能的影响，采用尿素-硝酸盐燃烧法制备了不同Mg2+掺量的La9.33Si6-xMgxO26-x（x=0.0，0.1，0.3，0.5，0.7，0.9）。X射线衍射（XRD）结果显示,Mg2+掺杂后晶体晶胞体积增大，拓宽了间隙氧的传导通道。通过X射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）等表征确定了Mg2+取代Si4+位点，形成了[Si（Mg）O4]四面体。扫描电子显微镜（SEM）结果显示：Mg2+掺杂样品能够改善微观结构致密性，从而提高烧结的质量与致密度；电化学阻抗谱（EIS）测试结果表明样品的电导性能随Mg2+掺量的增加呈先增强后减弱的趋势，当掺量x=0.3时，电导率有着较大的提升（600 ℃下电导率达到10.22×10-4 S/cm），活化能则呈现先减小后增大的趋势。研究表明Mg2+掺杂可诱导产生氧空位，为氧离子传导提供有效载体，氧空位缺陷提升是其电导增强的机理。
Abstract:
To investigate the effects of Mg2+ doping on the phase structure，chemical valence，microstructure，and electrochemical properties of apatite-type lanthanum silicate （La9.33Si6O26，LSO），La9.33Si6-xMgxO26-x （x = 0.0，0.1，0.3，0.5，0.7，0.9） with various Mg2+ doping contents were synthesized via the urea-nitrate combustion method. X-ray diffraction （XRD） results revealed that Mg2+ doping enlarged the unit cell volume and widened the conduction channel of interstitial oxygen. Characterizations including X-ray photoelectron spectroscopy （XPS）and Fourier transform infrared spectroscopy （FTIR） confirmed that Mg2+ occupied the Si4+ sites，leading to the formation of [Si（Mg）O4] tetrahedron. Scanning electron microscopy （SEM） observations indicated Mg2+ doping could improve the microstructural densification and thus enhance sintering quality and compactness. Electrochemical impedance spectroscopy （EIS） measurements demonstrated that the conductivity of the samples first increased and then decreased with rising Mg2+ content. A remarkable enhancement in conductivity was achieved at x = 0.3 (10.22×10-4 S/cm at 600 ℃)，while the activation energy showed the opposite trend, i.e.，decreasing first and then increasing. It is concluded that Mg2+ doping can induce the formation of oxygen vacancies，which serve as efficient carriers for oxygen ion conduction，and the increased oxygen vacancy defects are responsible for the improved conductivity.

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备注/Memo

备注/Memo:
收稿日期：2026-03-19
基金项目：国家自然科学基金（51374155，50774055）
作者简介：袁 洋，硕士研究生。Email：1196544072@qq.com
*通信作者：黄志良，博士，教授。Email：hzl16455@126.com
更新日期/Last Update: 2026-06-26