ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Direct Determination of Standard Gibbs Energies of the Formation of 4CaO·P2O5 and 3CaO·P2O5 by Transpiration Method
Eiji YamasueKenji ShimizuKazuhiro Nagata
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2013 Volume 53 Issue 10 Pages 1828-1835

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Abstract

The standard Gibbs energy changes of the following reactions have been measured by using transpiration method;


The standard Gibbs energies of the formation of 4CaO·P2O5 (ΔG°f,(4CaO·P2O5)) and 3CaO·P2O5 (ΔG°f,(3CaO·P2O5)) have been derived as follows;


The reasons for discrepancies from reported values were discussed from the view point of whether the activity of phosphorus is measured directly or not.

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© 2013 by The Iron and Steel Institute of Japan
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