日本金属学会誌

J. Japan Inst. Metals, Vol. 45, No. 4 (1981),
pp. 368-373

Density and Molar Volume of MgCl2-CsCl Binary Melt

Tatsuhiko Ejima1, Yuzuru Sato1, Akio Ando2 and Teruhiko Asakawa3

1Department of Metallurgy, Faculty of Engineering, Tohoku University, Sendai
2Graduate School, Tohoku University, Sendai. Present address: Toshiba Corporation, Tokyo
3Faculty of Engineering, Tohoku University, Sendai. Present address: Alps Electric Co., Ltd., Tokyo

Abstract:

Density of MgCl2-CsCl binary melt has been measured over the temperature range of liquidus to about 1200 K by means of the manometric method using a transparent furnace and U-type manometer. The results obtained are summarized as follows:
The density increases monotonously with increasing CsCl content. The expansion coefficient of pure MgCl2 is significantly small, but that of the binary melt increases to about 30 mol%CsCl. The molar volume deviates positively from the additivity over the whole range of composition, and its deviation shows a maximum at about 65 mol%CsCl which corresponds nearly to the stoichiometric composition of the compound Cs2MgCl4. In the binary melt, the partial molar volume of MgCl2 increases steeply with increasing CsCl content in the composition range of more than 50 mol%CsCl, while that of CsCl exhibits a maximum at about 30 mol%CsCl. The volumetric behavior of the melt was explained in terms of the model which describes the constitution of ionic species including the MgCl42- complex anion in the melt.
The molar volume and expansion coefficient of each compound included in the melt were estimated by using the model of construction of the melt containing MgCl2 on the assumption of the additivity among the volumes of ionic species.


(Received 1980/12/23)

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