Ba 2+和In 3+共掺杂硅酸镧固体电解质的制备及性能

doi:10.11962/1006-4990.2019-0116

摘要/Abstract

摘要：

采用高温固相法制备磷灰石型硅酸镧陶瓷La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ（x=0,0.1,0.2,0.3,0.4）。采用XRD、SEM和拉曼光谱等测试分析手段表征了La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ固体电解质掺杂体系的相组成和微观形貌特征;采用交流阻抗谱测试研究了La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ掺杂体系在不同温度下的电导率变化规律。研究发现,所有La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ陶瓷试样的结晶度良好且均具有氧基磷灰石结构;仅在La位掺杂Ba ²⁺时,La_9.4Ba_0.6Si₆O_27-_δ试样晶粒形貌不规则,In ³⁺掺杂后晶粒呈等轴状均匀生长。各个试样的总电导率与测试温度之间符合Arrhenius关系。In ³⁺最佳掺杂量x为0.2,此时La_9.4Ba_0.6Si_5.8In_0.2O_27-_δ陶瓷具有最高的电导率,其电导率（1 073 K）、活化能和指前因子分别为5.08×10 ^-3 S/cm、0.86 eV和2.91×10 ¹¹ S·K/cm。

关键词: 磷灰石型硅酸镧, 共掺杂, 电导率, 高温固相法

Abstract:

Apatite-type lanthanum silicate ceramic La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ（x=0,0.1,0.2,0.3,0.4） were synthesized by the high-temperature solid-phase reaction method.The phase composition and microstructure characteristics of the La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ solid electrolyte doped system were characterized by XRD,SEM and Raman spectrum.The change law of conductivity at different temperatures of La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ were studied by AC impedance spectroscopy test.It was found that all the ceramic samples of La_9.4Ba_0.6Si_6-_xIn_xO_27-_δ had good crystallinity and oxygen radicals apatite structure.The grain shape of La_9.4Ba_0.6Si₆O_27-_δ sample only doping Ba ²⁺ in La was irregular.The grain of the samples grew evenly in uniform axis after doped by In ³⁺.There was Arrhenius behavior between total conductivity of all samples and test temperatures.The optimal doping amount x of In ³⁺ was 0.2.La_9.4Ba_0.6Si_5.8In_0.2O_27-_δ ceramic had the highest conductivity.The conductivity（1 073 K）,activation energy and former factors were 5.08×10 ^-3 S/cm,0.86 eV and 2.91×10 ¹¹ S·K/cm,respectively.

Key words: apatite-type lanthanum silicate, co-doped, conductivity, high temperature solid phase method

中图分类号:

TQ133.3

赵艳琴,闫书山,王岭,曹吉林. Ba ²⁺和In ³⁺共掺杂硅酸镧固体电解质的制备及性能[J]. 无机盐工业, 2020, 52(1): 49-53.

Zhao Yanqin,Yan Shushan,Wang Ling,Cao Jilin. Preparation and performance of Ba ²⁺ and In ³⁺ co-doped lanthanum oxyapatite solid electrolyte[J]. Inorganic Chemicals Industry, 2020, 52(1): 49-53.

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参考文献 16

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固体电解质	a/nm	b/nm	c/nm	V/nm³
La₁₀Si₆O_27-_δ	0.9709	0.9709	0.7176	0.585
La_9.4Ba_0.6Si₆O_27-_δ	0.9748	0.9748	0.7233	0.595
La_9.4Ba_0.6Si_5.9In_0.1O_27-_δ	0.9729	0.9729	0.7229	0.592
La_9.4Ba_0.6Si_5.8In_0.2O_27-_δ	0.9733	0.9733	0.7237	0.593
La_9.4Ba_0.6Si_5.7In_0.3O_27-_δ	0.9735	0.9735	0.7244	0.594
La_9.4Ba_0.6Si_5.6In_0.4O_27-_δ	0.9738	0.9738	0.7249	0.595

电解质	电导率σ/ （S·cm^-1）	活化能 E/eV	指前因子 σ₀/（S·K·cm^-1）
La₁₀Si_5.8In_0.2O_27-_δ	1.54×10^-3	0.83	6.45×10⁹
La_9.4Ba_0.6Si₆O_27-_δ	1.17×10^-3	0.84	7.28×10⁹
La_9.4Ba_0.6Si_5.9In_0.1O_27-_δ	1.66×10^-3	0.80	1.80×10⁹
La_9.4Ba_0.6Si_5.8In_0.2O_27-_δ	5.08×10^-3	0.86	2.91×10¹¹
La_9.4Ba_0.6Si_5.7In_0.3O_27-_δ	1.62×10^-3	0.84	6.66×10⁹
La_9.4Ba_0.6Si_5.6In_0.4O_27-_δ	1.62×10^-3	0.84	6.67×10⁹

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Ba ²⁺和In ³⁺共掺杂硅酸镧固体电解质的制备及性能

Preparation and performance of Ba ²⁺ and In ³⁺ co-doped lanthanum oxyapatite solid electrolyte

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