Abstract
The behavior of the Gruneisen parameter of single-crystal fullerite C60 has been studied experimentally near orientational phase transitions at 90 and 260 K. The measurements have been performed by the photoacoustic method using an automated photoacoustic device with laser excitation (the intensity was modulated by a harmonic law) and shadow piezoelectric detection. The temperature dependence of the relative change in the Gruneisen parameter in the fullerite C60 single crystal has been measured near the phase transitions at 90 and 260 K. The results have been analyzed.
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