Heat capacity and entropy of low structural state plagioclases
作者： A. Benisek , E. Dachs , M. A. Carpenter
DOI: 10.1007/S00269-012-0556-2
关键词: Phase transition 、 Heat capacity 、 Specific heat 、 Thermodynamics 、 Negative deviation 、 Plagioclase 、 Vibrational entropy 、 Anorthite 、 Chemistry 、 Differential scanning calorimetry
摘要: The heat capacity of 11 different compositions the low structural state plagioclase binary was measured between 5 and 773 K. results are compared to those obtained from synthetic high samples investigated in a previous study heat-treated natural sample this study. anorthite with slightly order parameters shows large differences at ~500 K, where Ibar1-Pbar1 phase transition occurs, which affects petrological calculations. At T = 298.15 vibrational entropy versus composition behaviour plagioclases is almost ideal, contrast positive excess entropies. higher temperatures, show negative deviation ideal Na-rich region.
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