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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of grain size on the electrical properties of strontium and magnesium doped lanthanum gallate electrolytes
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Effect of grain size on the electrical properties of strontium and magnesium doped lanthanum gallate electrolytes

机译：晶粒尺寸对锶和镁掺杂镧的电解质电解的影响

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摘要

The aim of this research is to investigate the effect of average grain size on electrical and electrochemical performances of La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM). For this purpose, the glycine-nitrate method is used to synthesize the LSGM electrolytes and subsequently sintered at 1350, 1400, 1450 and 1500 degrees C in a muffle furnace with temperature holding for 10 h. XRD study reveals that all of the sintered LSGM ceramic electrolytes crystallize to a single phase of orthorhombic perovskite structure without any impurity phases. Results from scanning electron microscopy (SEM) study demonstrate that increasing sintering temperature from 1350 to 1500 degrees C leads to increase in average grain size from 1.02 to 4.87 mu m. Electrochemical AC impedance tests show that the bulk resistance is nearly independent on the average grain size, and the grain boundary resistance changes because of the difference in the average grain size. The LSGM sample sintered at 1500 degrees C achieves the maximum electrical conductivity 9.19 x 10(-2) S cm(-1) at 800 degrees C. The maximum power density of assembled cell with LSGM sintered at 1500 degrees C as an electrolyte is 0.76 W cm(-2) at 800 degrees C in air atmosphere. (C) 2018 Elsevier B.V. All rights reserved.
机译：该研究的目的是探讨平均粒度对La0.9SR0.1Ga0.8mg0.202.85（LSGM）电化学性能的影响。为此目的，甘氨酸 - 硝酸法用于合成LSGM电解质，随后在1350,1400,1450和1500摄氏度下烧结，在Muffle炉中，温度保持10小时。 XRD研究表明，所有烧结的LSGM陶瓷电解质都结晶到Orthombic钙钛矿结构的单相，没有任何杂质相。扫描电子显微镜（SEM）研究结果表明，从1350至1500℃增加烧结温度导致平均粒度从1.02〜4.87 mu m增加。电化学AC阻抗试验表明，由于平均晶粒尺寸的差异，散装电阻几乎独立于平均晶粒尺寸，并且晶界电阻变化。在1500℃下烧结的LSGM样品在800℃下实现最大电导率9.19×10（-2）Cm（-1）。用LSGM烧结为电解质的LSGM的最大功率密度为0.76在800摄氏度的空气气氛中W cm（-2）。 （c）2018年elestvier b.v.保留所有权利。

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