학술논문
Synthesis of Spinel MnCoO by Thermal Decomposition of Carbonates and Kinetics of Thermal Decomposition of Precursor.
Document Type
Article
Author
Source
Subject
*CARBONATE synthesis
*CARBONATE analysis
*ORGANIC synthesis
*THERMOGRAVIMETRY
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Language
ISSN
1557-1939
Abstract
The cubic MnCoO was prepared by calcining MnCO-2CoCO⋅1.5HO above 600 C in air. The precursor and its calcined products were characterized by thermogravimetry and differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy, and vibrating sample magnetometer. The result showed that high-crystallized MnCoO with cubic structure [space group Fd-3m(227)] was obtained when the precursor was calcined above 600 C in air for 6 h. Magnetic characterization indicated that cubic MnCoO behaved weak magnetic behavior at room temperature. The thermal process of the precursor in air experienced three steps, which are: first, the dehydration of 1.5 water molecules, then the decomposition of MnCO-2CoCO into cubic MnO and cubic CoO, and at last the reaction of MnO with CoO into cubic MnCoO. Based on the KAS equation, the values of the activation energies associated with the thermal process of MnCO-2CoCO⋅1.5HO were determined. [ABSTRACT FROM AUTHOR]