Pressure and temperature variation of the depolarized light scattering spectra of the fragile glass-former liquid salol
Istituto Nazionale per la Fisica della Materia, L.go E. Fermi 2, 50125, Florence, Italy
2 Universitá di Firenze, L.go E. Fermi 2, 50125, Florence, Italy
3 Laboratorio Europeo di Spettroscopia Nonlineare, L.go E. Fermi 2, 50125, Florence, Italy
Published online: 15 November 2000
The pressure and temperature dependences of the depolarized light scattering spectra of salol have been measured at isobaric condition P = 1 bar for T between 328 and 393 K, and at isothermal condition T = 343 K for P between 1 and 625 bar, i.e. outside the metastable liquid region. The experimental results for both the α- and β-relaxations can be well described by the Mode Coupling Theory. The independence of the power-law parameters a, and consequently and γ, from the thermodynamic variables T and P is demonstrated.The critical temperature Tc at 1 bar and the critical pressure Pc at T = 343 K have been determined from the normal liquid state.
PACS: 64.70.Pf – Glass transitions / 07.35.+k – High-pressure apparatus and techniques; shock tubes; diamond anvil cells / 78.35.+c – Brillouin and Rayleigh scattering; other light scattering
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000