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首页> 外文期刊>Journal of Materials Engineering and Performance >Structure and Electrical Properties of Mn-Cu-O Spinels
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Structure and Electrical Properties of Mn-Cu-O Spinels

机译：Mn-Cu-O尖晶石的结构和电性能

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摘要

The study presents the results of structural and electrical conductivity investigations of a Cu1.3Mn1.7O4 spinel obtained using EDTA gel processes. An amorphous gel was synthesized and calcinated for 5 h in air at temperatures of 673, 773, 873, and 973 K. When calcinating the gel at temperatures below 973 K, the obtained powders consisted of two phases-the regular Cu1.5Mn1.5O4 spinel and manganese(III) oxide. At 973 K, Mn2O3 was no longer observed, but a new Mn3O4 phase appeared in addition to the Cu1.5Mn1.5O4 spinel. Green bodies prepared from these powders were sintered for 2 h in air at 1393 K. The obtained sinters had a porosity of around 12% and were composed predominantly of the spinel phase, with minor amounts of Mn3O4 and, in the case of three of four sinters-CuO. Electrical conductivity measurements were taken over the temperature range of 300-1073 K. A change in the character of conductivity of the studied sinters was observed in the range of 400-430 K, and it was associated with an increase in activation energy from 0.20 to 0.56 eV. The electrical conductivity of the studied sinters ranged from 74.8 to 88.4 S cm(-1), which makes the Cu1.3Mn1.7O4 material suitable for application as a protective-conducting coating in IT-SOFC ferritic stainless steel interconnects.
机译：该研究介绍了使用EDTA凝胶方法获得的Cu1.3Mn1.7O4尖晶石的结构和导电性研究的结果。在673,773,873和973k的温度下在空气中合成并煅烧固体凝胶。当在973k的温度下煅烧凝胶时，所得粉末由两相 - 规则Cu1.5mn1.5O4组成尖晶石和锰（III）氧化物。在973k，不再观察到Mn 2 O 3，但除了Cu1.5mN1.5O4尖晶石之外，还出现了新的Mn3O4相。由这些粉末制备的生物在1393k的空气中烧结2小时。所获得的烧结孔隙率约为12％，主要由尖晶石相组成，少量Mn3O4，并且在四个中的三种情况下索特斯-CUO。在300-1073k的温度范围内取出电导率测量。在400-430k的范围内观察到所研究的烧结率的导电性特征的变化，并且它与0.20的激活能量增加相关0.56eV。所研究的烧结的电导率范围为74.8至88.4 s cm（-1），其使得Cu1.3mn1.7O4材料制成适用于IT-Sofc铁素体不锈钢互连的保护导电涂层。

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