NDLI: Structure and Electrical Properties of Mn-Cu-O Spinels

Content Provider	Springer Nature Link
Author	Bobruk, M. Durczak, K. Dąbek, J. Brylewski, T.
Copyright Year	2017
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.
Starting Page	1598
Ending Page	1604
Page Count	7
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	26
Issue Number	4
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2017-03-13
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	electrical conductivity solid oxide fuel cell (SOFC) spinel solid solutions x-ray Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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