PVT Measurements on Fullerite from 30 to 330.degree.C and Pressure to 200 MPa

Li, Weisheng; Sherwood, R. D.; Cox, D. M.; Radosz, Maciej

doi:10.1021/je00015a014

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…We justify the assumption of V 0 independent of temperature and pressure by the overall agreement between our model and experiments, most notably, between the predicted and observed thermal expansion, see section 3.1.2 and figure 2(c). Such assumption holds in the vicinity of the phase transition, and would fail away from it as the thermal expansion of the individual plastic and crystal phases becomes non-linear in temperature [39].…”

Section: Thermodynamic Properties Of the Backgroundmentioning

confidence: 99%

Landau theory of barocaloric plastic crystals

Marín-Delgado,

Moya,

Guzmán-Verri

2024

J. Phys. Energy

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We present a minimal Landau theory of plastic-to-crystal phase transitions in which the key components are a multipole-moment order parameter that describes the orientational ordering of the constituent molecules, coupling between such order parameter and elastic strains, and thermal expansion. We illustrate the theory with the simplest non-trivial model in which the orientational ordering is described by a quadrupole moment, and use such model to calculate barocaloric effects in plastic crystals that are driven by hydrostatic pressure. The model captures characteristic features of plastic-to-crystal phase transitions, namely large changes in volume and entropy at the transition, as well as the linear dependence of the transition temperature with pressure. We identify temperature regions in the barocaloric response associated with the individual plastic and crystal phases, and those involving the phase transition. Our model is in overall agreement with previous experiments in powdered samples of fullerite C60, and predicts peak isothermal entropy changes of ∼ 90 J K − 1 kg − 1 and peak adiabatic temperature changes of ∼ 35 K under 0.60 GPa at 265 K in fullerite single crystals.

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Section: Thermodynamic Properties Of the Backgroundmentioning

confidence: 99%