Thermodynamic and magnetic properties of knorringite garnet (Mg3Cr2Si3O12) based on low-temperature calorimetry and magnetic susceptibility measurements
Thermodynamic and magnetic properties of knorringite garnet (Mg3Cr2Si3O12) based on low-temperature calorimetry and magnetic susceptibility measurements
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基于低温量热法和磁化率测量的钙菱沸石石榴石 (Mg3Cr2Si3O12) 的热力学和磁性
DOI:
10.1007/s00269-013-0653-x
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发表时间:
2014
影响因子:
1.4
通讯作者:
Klemme S
中科院分区:
文献类型:
--
作者:
Wijbrans CH;Niehaus O;Rohrbach A;Pöttgen R;Klemme S
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 theCpdata, we suggest a standard entropy (298.15 K) of 301 ± 2.5 J mol−1K−1for Mg3Cr2Si3O12. The new data are also used in conjunction with previous experimental results to constrain ∆Hf° for knorringite.
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