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The entropy of zinc chromite (ZnCr2O4)

Published online by Cambridge University Press:  05 July 2018

S. Klemme  and
J. C. van Miltenburg
S. Klemme*
Affiliation:
Mineralogisches Institut, Universität Heidelberg, Im Neuenheimer Feld 236, 69120 Heidelberg, Germany
J. C. van Miltenburg
Affiliation:
Thermodynamic Centre, Utrecht University, Padualaan 8 3584 CH, Utrecht, The Netherlands
*
*E-mail: sklemme@min.uni-heidelberg.de
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Abstract

The low-temperature heat capacity of zinc chromite (ZnCr2O4) was measured between 6.5 K and 400 K using adiabatic calorimetry, and some thermochemical functions (CP(T), S(T), S°298, H(T)-H(0)) were derived from the results. The standard entropy (S°298 = 128.6±0.3 J mol-1 K-1) for zinc chromite was calculated from the results. Our calorimetric measurements indicate one extremely large anomaly in the heat capacity curve at ∼12.3 K which is related to the cubic-tetragonal transition in ZnCr2O4.

Keywords

zinc chromiteZnCr2O4heat capacitylow-temperature calorimetryentropygeometrically frustrated magnetsthermodynamics
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 3 , June 2004 , pp. 515 - 522
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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