燃烧法制备磷灰石型碱土掺杂硅酸镧电解质

doi:DOI:10.3969/j.cnki.jdxb.2017.01.014

吉首大学学报（自然科学版）

燃烧法制备磷灰石型碱土掺杂硅酸镧电解质

李文昭,黄志良,鲁冕,陈常连,张占辉

（武汉工程大学材料科学与工程学院，湖北武汉 430074）

出版日期:2017-01-25 发布日期:2017-01-17

Synthesis of Apatite-Type LSO Electrolyte Doped Alkali Earth by Urea-Nitrate Combustion

LI Wenzhao，HUANG Zhiliang，LU Mian，CHEN Changlian，ZHANG Zhanhui

(College of Material Science and Engineering，Wuhan Institute of Technology，Wuhan 430074，China)

Online:2017-01-25 Published:2017-01-17
About author:LI Wenzhao (1995—),female，was born in Ezhou City,Hubei Province，graduate student for master degree;research area is function materials
Supported by:
National Natural Science Foundation of China (51242010)；National Key Technology R&D Program (2013BAB07B01);Hubei Province Key Technology R&D Program (2014BCB034)；National Natural Science Foundation of Hubei Province of China (2014CFB796)

摘要/Abstract

摘要：

采用尿素-硝酸盐燃烧法，在较低温度下制备较高纯度无杂质相的碱土掺杂磷灰石型La9.33M_x(SiO₄)₆O₂+δ电解质.通过XRD、SEM、交流阻抗测试，对样品的结构、形貌及电导性能进行研究.结果表明，燃烧合成的无定形电解质粉体，在800 ℃煅烧12 h后，具有P63/m磷灰石型晶体结构；掺杂对LSO烧结体微观产生一定的影响，烧结体的结构和形貌随x值的变化而变化.此外，LSO烧结体具有良好的电阻可逆性和稳定性.适量的掺杂可有效提高LSO的离子电导率，过量的掺杂反而会降低离子电导率，最佳掺杂摩尔分数为0.2.而随着碱土金属阳离子半径增大，掺杂效果也越来越好.

关键词： 磷灰石型固体电解质, 硅酸镧, 碱土掺杂, 燃烧法, 电导率

Abstract:

The urea-nitrate combustion method was introduced to prepare high purity La9.33M_x(SiO₄)₆O₂+δ (M are Sr，Ca and Mg) conductor at low-temperature.The as-prepared samples were investigated by XRD，FT-IR，SEM and EIS.The results showed that the powders transformed into P63/m apatite-type after burning at 800 ℃ for 12 h.Obvious effects of alkali earth doping amount on the microcosmic appearance of sintered La9.33Mx(SiO4)6O2+δwas observed，and the crystal structures altered with the different doping content.In addition，La9.33Mx(SiO4)6O2+δ sintered body possessed good resistance reversibility and stability.The conductivity was improved efficiently with the proper amount of alkali earth oxide，and the optimal doping content was 0.2.Under the same doping content，the ionic conductivity was enhanced as the radius of alkali earth cationic increased (Sr⁺＞Ca⁺＞Mg⁺).

Key words: apatite type solid electrolyte, lanthanum silicate, alkali earth doping, combustion, ionic conductivity

李文昭,黄志良,鲁冕,陈常连,张占辉. 燃烧法制备磷灰石型碱土掺杂硅酸镧电解质[J]. 吉首大学学报（自然科学版）, DOI: DOI:10.3969/j.cnki.jdxb.2017.01.014.

LI Wenzhao，HUANG Zhiliang，LU Mian，CHEN Changlian，ZHANG Zhanhui. Synthesis of Apatite-Type LSO Electrolyte Doped Alkali Earth by Urea-Nitrate Combustion[J]. Journal of Jishou University（Natural Sciences Edition), DOI: DOI:10.3969/j.cnki.jdxb.2017.01.014.

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燃烧法制备磷灰石型碱土掺杂硅酸镧电解质

Synthesis of Apatite-Type LSO Electrolyte Doped Alkali Earth by Urea-Nitrate Combustion

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