CADMIUM(II)BIS(OXALATO)COBALTATE(II)-PENTAHYDRATE Thermal decomposition

N. Deb

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CADMIUM(II)BIS(OXALATO)COBALTATE(II)-PENTAHYDRATE Thermal decomposition

机译：CADMIUM(II)BIS(OXALATO)COBALTATE(II)-PENTAHYDRATE Thermal decomposition

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A mixed metal carboxylate, cadmium(II)bis(oxalato)cobaltate(II)pentahydrate, has been synthesized and characterized by elemental analysis, IR spectral, reflectance and X-ray powder diffraction studies. Thermal decomposition studies (TO, DTO and DTA) in air showed that the compound decomposed to CdCoO_3 at 370 ℃ through the formation of an anhydrous compound at ～194 ℃. Finally, CdCoO_2 is generated at 1000 ℃. DSC study in nitrogen up to 550 ℃ showed the formation of a mixture of CdO and CO_3O_4 as end products. The kinetic parameters have been evaluated for the dehydration and decomposition steps using four non-mechanistic equations, i.e., Freeman and Carroll, Coats and Redfern, Flynn and Wall, MacCallum and Tanner equations. Using seven mechanistic equations, the rate controlling processes of the dehydration and decomposition mechanism are also inferred. The kinetic parameters, AH and AS obtained from DSC are discussed. IR and X-ray powder diffraction studies identified some of the decomposition products. A tentative mechanism for the decomposition in air is proposed.

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《Journal of thermal analysis and calorimetry》 |2004年第3期|837-846|共10页
作者
N. Deb;
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作者单位

Department of Chemistry, North Eastern Regional Institute of Science and Technology, Nirjuli 791109, Itanagar, Arunachal Pradesh, India;

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正文语种英语
中图分类分析化学;
关键词
kinetic parameters; mechanistic; oxalato; TG-DTA-DSC; thermal decomposition;

CADMIUM(II)BIS(OXALATO)COBALTATE(II)-PENTAHYDRATE Thermal decomposition

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