Thermodynamic properties of uvarovite garnet (Ca3Cr2Si3O12)

The low-temperature heat capacity of uvarovite (Ca3Cr2Si3O12) was measured between 2 and 400 K, and thermochemical functions were derived from the results. The measured heat-capacity curve shows a significant lambda-shaped anomaly peaking at around 9 K. The nature of this transition is unknown. From...

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Bibliographic Details
Published inThe American mineralogist Vol. 90; no. 4; pp. 663 - 666
Main Authors Klemme, S, van Miltenburg, J. C, Javorsky, P, Wastin, F
Format Journal Article
LanguageEnglish
Published Washington Mineralogical Society of America 01.04.2005
De Gruyter
Walter de Gruyter GmbH
Subjects
crystal chemistry
entropy
experimental studies
garnet group
grossular
heat capacity
laboratory studies
low pressure
Mineralogy
nesosilicates
orthosilicates
pressure
silicates
thermodynamic properties
Thermodynamics
uvarovite
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Summary:The low-temperature heat capacity of uvarovite (Ca3Cr2Si3O12) was measured between 2 and 400 K, and thermochemical functions were derived from the results. The measured heat-capacity curve shows a significant lambda-shaped anomaly peaking at around 9 K. The nature of this transition is unknown. From our data, we suggest a standard entropy for uvarovite at 298.15 K of 320.9 ± 0.6 J/(mol·K).
ISSN:0003-004X
1945-3027
DOI:10.2138/am.2005.1812