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Thermodynamic mixing properties of pyrrhotine, Fe1_XS

Published online by Cambridge University Press:  05 July 2018

Roger Powell
Roger Powell*
Affiliation:
Department of Earth Sciences, University of Leeds, Leeds LS2 9JT
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Abstract

Published data from pyrrhotine-vapour equilibrium experiments are used to make inferences concerning the high-temperature thermodynamic mixing properties of pyrrhotine. Darken's quadratic formalism provides the justification for plotting activity of sulphur data against (1−X)2, where X is used in Fe1−XS to express the composition of non-stoichiometric pyrrhotine. Such plots show that the thermodynamic behaviour of pyrrhotine appears to be different on either side of X = 0.125, the Fe7S8 composition.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 345 , December 1983 , pp. 437 - 440
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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