Determination of Gibbs energy of formation of cuspidine (3CaO • 2SiO2CaF2) by transpiration method

被引：7
|
作者：
Fukuyama, H [2 ]
Tabata, H
Oshima, T
Nagata, K
机构：
[1] Tohoku Univ, IMAM, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tokyo Inst Technol, Dept Chem & Mat Sci, Tokyo 1528552, Japan
来源：
ISIJ INTERNATIONAL | 2004年 / 44卷 / 09期
关键词：
Gibbs energy of formation; cuspidine; 2Cao center dot 2SiO(2) center dot CaF2; Cao-SiO2-CaF system; transpiration method; mold powder;
D O I：
10.2355/isijinternational.44.1488
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The standard Gibbs energy change of the following reaction of cuspidine (3CaO . 2SiO(2) . CaF2) with water vapor has been determined by a transpiration method as 3CaO . 2SiO(2) . CaF2 (s) + H2O (g) = 2(2CaO . SiO2)(s) + 2HF (g) Delta(t)Gdegrees/kJ=265-0.116T (+/-16) (1221<T/K<1469) From this result, the standard Gibbs energy of formation of cuspidine has been evaluated as, Delta(t)Gdegrees(cuspidine)/kJ mol(-1)=-5718+0.813T(+/-19) (1221<T/K<1469) The constituent activities of the CaO-SiO2-CaF2 system and fluorine emission from the system at elevated temperatures have been evaluated based on the obtained thermodynamic data.
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页码：1488 / 1493
页数：6
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