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KMID : 1059520100540020192
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Journal of the Korean Chemical Society
2010 Volume.54 No. 2 p.192 ~ p.197
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The Study on Thermal Analysis and Thermodynamic Characteristics of Spinel Compounds(ZnCo2O4, NiCo2O4)
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Kim Jae-Uk
Ji Myoung-Jin
Cha Byung-Kwan
Kim Chul-Hyun
Jang Won-Choeul
Kim Jong-Gyu
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Abstract
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The spinel compound was obtained by the thermal decomposition of Zn-Co and Zn-Ni gel prepared by sol-gel method using oxalic acid as a chelating agent. The formation of spinel compound has been comfirmed by thermogravimetric analysis (TGA), x-ray powder diffraction (XRD) and infrared spectroscopy (IR). The particle size of 13 nm∼16 nm was calculated by Scherrer`s equation. The sol-gel method provides a practicable and effective route for the synthesis of the spinel compound at low temperature (350 oC). The kinetic parameters such as activation energy (Ea) and pre-exponential factor (A) for each compound were found by means of the Kissinger method and Arrhenius equation. The decomposition of spinel compound has an activation energy about 155 kJ/mol. Finally, the thermodynamic parameters (△Gφ, △Hφ, △Sφ) for decomposition of spinel compound was determined.
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KEYWORD
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Spinel, TGA, Kissinger, Activation energy(Ea), Thermodynamic parameter
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