照射炭酸亜鉛の熱分解
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概要
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The thermal decomposition in vacuo of synthetic zinc carbonate and smithonite, virgin and irradiated 2.4x10^5 to 2.4x10r^7 of 60Co gamma-rays, has been studied kinetically in the temperature ranges 200℃ to 250℃ and 370℃ to 430℃. Although the irradiation enhances the rate of decomposition, it has been found that the irradiation at 1.05x10^6 or 2.4x10^6 r and 1.2x10^7 r brings to maximum, and further irradiation has no effect or decreasing effect on the rate of decomposition. The rate was described by using different rate equations for different stages of the process. Best results were obtained with the degree of decomposition in the initial, acceleratory and decay periods i-(1-α)^(1/3)=kt or 1-(1-α)^(1/2)=kt, dα/dt=kα^(2/3)(1-α), and -log(1-α)=kt respectively. The combined results of these experiments gave the following activation energies (per mole) for the decomposition of the virgin and irradiated zinc carbonate (I) and smithonite (II), (a)35.5-37.6, 26.2-34.9 (I), 50.8-51.9, 42.3-48.7 (II) Kcal for the initial reaction ; (b) 46.2, 38.5-45.6 (I), 78.9, 70.1-76.4 (II) Kcal for the acceleration period, (c) 55.1, 46.2-54.9 (I) 83.6, 70.7-80.7 (II) Kcal for the decay period respectively. The absence of an induction period owing to the irradiation indicates that nucleation is rapid and complete at the biginning of the reaction. The observed irradiation effects are considered in terms of current ideas of irradiation damage.
- 山形大学の論文
- 1970-03-25