A study of the depolarized light scattering spectra of high pressure supercooled pentachlorobiphenyl is presented. From the analysis of the propagative shear doublet, the infinite shear modulus Gx is measured over a large pressure range, at various temperatures, up to a pressure where the liquid is in a glassy state. Gx(P) is found to vary linearly at each temperature. From values of Gx (P = 0.1 MPa) together with those obtained in a previous paper at P = 0.1 MPa as a function of T, it is concluded that Gx(T) is linear over 70 °C, contrary to what is generally obtained in most of the supercooled molecular liquids.
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Bezot et al. (1983) studied this question.