Effects of additives on solid state reaction. III. Effects of halide additives on the formation of MgFe2O4.
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概要
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The promoting effects of halide additives on the formation of MgFe<SUB>2</SUB>O<SUB>4</SUB> have been studied on the basis of both kinetic and thermoanalytical data. A mixture of MgO and α-Fe<SUB>2</SUB>O<SUB>3</SUB> powder containing 10 mol% additive (LiF, NaF, MgF<SUB>2</SUB>, BaF<SUB>2</SUB>, NaCl, or KCl) and that without additive were isothermally heated in a vacuum (<I>P</I>o<SUB>2</SUB>=10<SUP>0</SUP>–10<SUP>1</SUP> mmHg) in the temperature range 666–1018 °C. High temperature X-ray analysis on MgO–Fe<SUB>2</SUB>O<SUB>3</SUB> and MgO–Fe<SUB>2</SUB>O<SUB>3</SUB>–additive systems was carried out at a heating rate of 3 °C/min <I>in vacuo</I>, (<I>P</I>o<SUB>2</SUB>=1<SUP>−1</SUP> mmHg). In the case of fluoride, it seems that the reactions between the fluoride and the reactants, α-Fe<SUB>2</SUB>O<SUB>3</SUB> or MgO, promote MgFe<SUB>2</SUB>O<SUB>4</SUB> formation in the initial stage and that compounds produced by the initial reaction accelerate diffusion in the later stage. The same promoting mechanism seems to be applicable to the case of chloride additives. The interaction between solids of NaCl and α-Fe<SUB>2</SUB>O<SUB>3</SUB> occurring just before the melting of NaCl seems to initiate MgFe<SUB>2</SUB>O<SUB>4</SUB> formation.
- 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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Ishii Tadao
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University
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