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Mineralogical Magazine; June 2004; v. 68; no. 3; p. 515-522; DOI: 10.1180/0026461046830202
© 2004 Mineralogical Society of Great Britain and Ireland
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The entropy of zinc chromite (ZnCr2O4)

S. Klemme1,* and J. C. Van Miltenburg2

1 Mineralogisches Institut, Universität Heidelberg, Im Neuenheimer Feld 236, 69120 Heidelberg, Germany
2 Thermodynamic Centre, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands

* E-mail: sklemme{at}min.uni-heidelberg.de

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 chromite, ZnCr2O4, heat capacity, low-temperature calorimetry, entropy, geometrically frustrated magnets, thermodynamics




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D. Levy, V. Diella, A. Pavese, M. Dapiaggi, and A. Sani
P-V equation of State, thermal expansion, and P-T stability of synthetic zincochromite (ZnCr2O4 spinel)
American Mineralogist, July 1, 2005; 90(7): 1157 - 1162.
[Abstract] [Full Text] [PDF]


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