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Vibrational entropy of disordering in omphacite.
Benisek, Artur; Dachs, Edgar; Carpenter, Michael A; Joachim-Mrosko, Bastian; Vielreicher, Noreen M; Wildner, Manfred.
Afiliación
  • Benisek A; Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Str. 2a, 5020 Salzburg, Austria.
  • Dachs E; Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Str. 2a, 5020 Salzburg, Austria.
  • Carpenter MA; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ UK.
  • Joachim-Mrosko B; Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria.
  • Vielreicher NM; Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Str. 2a, 5020 Salzburg, Austria.
  • Wildner M; Institute of Mineralogy and Crystallography, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, Austria.
Phys Chem Miner ; 50(4): 36, 2023.
Article en En | MEDLINE | ID: mdl-38037626
The cations of an ordered omphacite from the Tauern window were gradually disordered in piston cylinder experiments at temperatures between 850 and 1150 °C. The samples were examined by X-ray powder diffraction and then investigated using low-temperature calorimetry and IR spectroscopy. The low-temperature heat capacity data were used to obtain the vibrational entropies, and the line broadening of the IR spectra served as a tool to investigate the disordering enthalpy. These data were then used to calculate the configurational entropy as a function of temperature. The vibrational entropy does not change during the cation ordering phase transition from space group C2/c to P2/n at 865 °C but increases with a further temperature increase due to the reduction of short-range order. Supplementary Information: The online version contains supplementary material available at 10.1007/s00269-023-01260-7.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Chem Miner Año: 2023 Tipo del documento: Article País de afiliación: Austria Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Chem Miner Año: 2023 Tipo del documento: Article País de afiliación: Austria Pais de publicación: Alemania