Vibrational and calorimetric study of phase transitions in n-C6F14 and n-C8F18 crystals |
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| Authors: | M Campos-Vallette M Rey-Lafon R Lagnier |
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| Institution: | Laboratoire de Spectroscopie Infrarouge, Université de Bordeaux 1, Laboratoire associé, LA 124, 351, Cours de la Libération, 33405 Talence Cedex, France;Service des Basses Températures, Laboratoire de Cryophysique, Centre d''Etudes Nucléaires de Grenoble, 85 X, 38041 Grenoble Cedex, France |
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| Abstract: | Heat capacities of n-perfluorohexane and n-perfluorooctane were measured from 4.2 K to room temperature. One solid—solid transition is found for n-C6H14,two for n-C8F18. Spectra show that the molecules have the same conformations in the two forms of n-C6F14. Several isomers are present in the high-temperature forms of n-C8F18;thus transitions in this compound have order—disorder character. |
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