Synthesis of CoxMn1−xO4 (0.9≤x≤2.7) nanopowders with controlled phase and composition via a gel-combustion method

CoxMn3−xO4 (CMO) nanopowders with a wide compositional range (0.9≤x≤2.7) are synthesized using a gel combustion method. The effect of Co content and calcination temperature on the crystal structure of the CMO nanopowders is studied using X-ray diffraction. A highly crystalline cubic spinel structure...

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Bibliographic Details
Published in:Ceramics international 2016-11, Vol.42 (15), p.17168-17173
Main Authors: Han, HyukSu, Lee, Jae Seok, Lim, Jiun, Park, Kyoung Ryeol, Kim, Kang Min, Ryu, Jeong Ho, Yeo, Sunghwan, Forrester, Jennifer, Mhin, Sungwook
Format: Article
Language:English
Subjects:
Co–Mn–O
Gel combustion
Nanopowders
Thermistor
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Summary:CoxMn3−xO4 (CMO) nanopowders with a wide compositional range (0.9≤x≤2.7) are synthesized using a gel combustion method. The effect of Co content and calcination temperature on the crystal structure of the CMO nanopowders is studied using X-ray diffraction. A highly crystalline cubic spinel structure can be obtained at a relatively low temperature (~700°C) for CMO with a Co content of 1.8. Further increases in Co content to 2.7 leads to a higher formation temperature (~800°C) required in order to form a crystalline cubic structure. X-ray photoelectron spectroscopy revealed that the Co and Mn cations have mixed valence states. Energy dispersive X-ray elemental mapping indicates that Co and Mn cations are homogeneously distributed in the CMO nanopowders. Thermogravimetric analysis, Fourier transform infrared, scanning electron microscopy, and X-ray fluorescence are utilized to investigate the formation of the CMO nanopowders, as well as the compositional and structural properties.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2016.08.006