Effects of Additives on Solid State Reaction. I. A Kinetic Study of the Effects of Halides of the Formation of MgAl<SUB>2</SUB>O<SUB>4</SUB>
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概要
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The mechanism for the promoting effects of additives on the formation of MgAl<SUB>2</SUB>O<SUB>4</SUB> has been systematically discussed from the results of kinetic measurements. A mixture of MgO and α-Al<SUB>2</SUB>O<SUB>3</SUB> powder containing 10 mol% additives (LiF, NaF, MgF<SUB>2</SUB>, GaF<SUB>2</SUB>, BaF<SUB>2</SUB>, NaCl or CaCl<SUB>2</SUB>) and that without additives were isothermally heated in N<SUB>2</SUB> atmosphere in the temperature ranges 670–1142°C and 1190–1360 °C. The diffusion-controlled Jander's equation was applied to all kinetic data obtained. In the case of fluoride additives, it has been found that the promoting actions are in the order LiF≥NaF>BaF<SUB>2</SUB>>MgF<SUB>2</SUB>>CaF<SUB>2</SUB> and that the cations of fluorides play an important role in accelerating diffusion. The same promoting mechanism seems to be applicable in the case of chloride additives.
- 公益社団法人 日本化学会の論文
著者
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Ishii Tadao
Deparmtnet Of Poultry And Animal Sciences Gifu University
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Shimada Shiro
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University
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Furuichi Ryusaburo
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University
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