Thermal dehydration reactions of bivalent transition metal malonate dihydrates in solid state.
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概要
- 論文の詳細を見る
The kinetics of the thermal dehydration reactions of MC<SUB>3</SUB>H<SUB>2</SUB>O<SUB>4</SUB>·2H<SUB>2</SUB>O(M=Mn(II), Fe(II), Co(II), Ni(II), and Zn(II)) were studied by the Freeman-Carroll and Coats-Redfern methods on the basis of the TG and DTG in nitrogen. The most reasonable reaction order for all the salts was found to be 2/3, indicating that the rate is controlled by the chemical process at a phase-boundary. This was also confirmed by the microscopic observations. The values of activation energy and frequency factor were 70–90 kJ mol<SUP>−1</SUP> and 10<SUP>7</SUP>–10<SUP>10</SUP> s<SUP>−1</SUP>, respectively. The enthalpy changes for all the salts were determined to be 60–80 kJ mol<SUP>−1</SUP> by the DSC measurements. The X-ray powder diffractograms, infrared absorption and diffuse reflectance spectra of the hydrates and anhydrous salts were also examined to obtain informations on their crystal and bonding structures.
- 公益社団法人 日本化学会の論文
著者
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Sone Kozo
Department Of Chemistry Faculty Of Science Josai University
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Tanaka Nobuyuki
Department Of Botany Kochi Prefectural Makino Botanical Garden
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Muraishi Kazuo
Department of Chemistry, Faculty of Science, Yamagata University
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Nagase Kenzo
College of General Education, Tohoku University
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