Structure and Electrical Properties of Mn-Cu-O Spinels
Source abstract
Abstract
The study presents the results of structural and electrical conductivity investigations of a Cu 1.3 Mn 1.7 O 4 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 Cu 1.5 Mn 1.5 O 4 spinel and manganese(III) oxide. At 973 K, Mn 2 O 3 was no longer observed, but a new Mn 3 O 4 phase appeared in addition to the Cu 1.5 Mn 1.5 O 4 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 Mn 3 O 4 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 Cu 1.3 Mn 1.7 O 4 material suitable for application as a protective-conducting coating in IT-SOFC ferritic stainless steel interconnects.
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Research context
OpenAlex topics: Electrical and Thermal Properties of Materials · Advancements in Solid Oxide Fuel Cells · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (24)
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