Abstract
Abstract The kinetics of the thermal dehydration reactions of MC3H2O4·2H2O(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−1 and 107–1010 s−1, respectively. The enthalpy changes for all the salts were determined to be 60–80 kJ mol−1 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.
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