Abstract
The temperature and enthalpy of dehydration or recrystallization of synthetic MgO · 3B 2O 3 · nH 2O ( n = 5, 6,7,7 1 2 ) during heating having been determined by DTA, TG, DTG and DSC. The products have been verified by X-ray powder diffraction, infrared spectrograms and chemical analysis and the thermochemical reactions have been given. The phase composition of the recrystallization at high temperature were confirmed as crystal-state 2MgO · 3B 2O 3 and amorphous B 2O 3 by physical analysis after the phase separated by esterification between B 2O 3 and methol alcohol. Using TG and DTG data, the kinetic parameters have been calculated by computer and the kinetic equations of non-isothermo-dehydration reactions have been given.
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