Thermodynamic and magnetic properties of knorringite garnet (Mg3Cr2Si3O12) based on low-temperature calorimetry and magnetic susceptibility measurements

被引：11
|
作者：
Wijbrans, C. H. [1 ]
Niehaus, O. [2 ]
Rohrbach, A. [1 ]
Poettgen, R. [2 ]
Klemme, S. [1 ]
机构：
[1] Univ Munster, Inst Mineral, D-48149 Munster, Germany
[2] Univ Munster, Inst Anorgan & Analyt Chem, D-48149 Munster, Germany
来源：
PHYSICS AND CHEMISTRY OF MINERALS | 2014年 / 41卷 / 05期
关键词：
Knorringite garnet; Heat capacity; Magnetic susceptibility; Low-temperature calorimetry; HEAT-CAPACITY; ADIABATIC CALORIMETRY; HIGH-PRESSURE; MANTLE; TRANSITION; PYROPE; PHASE; DATASET; MGCR2O4; SPINEL;
D O I：
10.1007/s00269-013-0653-x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The low-temperature heat capacity of knorringite garnet (Mg3Cr2Si3O12) was measured between 2 and 300 K, and thermochemical functions were derived from the results. The measured heat capacity curves show a sharp lambda-shaped anomaly peaking at around 5.1 K. Magnetic susceptibility data show that the transition is caused by antiferromagnetic ordering. From the C (p) data, we suggest a standard entropy (298.15 K) of 301 +/- A 2.5 J mol(-1) K-1 for Mg3Cr2Si3O12. The new data are also used in conjunction with previous experimental results to constrain a dagger H (f) A degrees for knorringite.
引用
收藏
页码：341 / 346
页数：6
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