Pressure and temperature variation of the depolarized light scattering spectra of the fragile glass-former liquid salol |
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Authors: | G Pratesi A Bellosi F Barocchi |
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Institution: | (1) Istituto Nazionale per la Fisica della Materia, L.go E. Fermi 2, 50125, Florence, Italy, IT;(2) Universitá di Firenze, L.go E. Fermi 2, 50125, Florence, Italy, IT;(3) Laboratorio Europeo di Spettroscopia Nonlineare, L.go E. Fermi 2, 50125, Florence, Italy, IT |
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Abstract: | 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 b and γ, from the thermodynamic variables T and P is demonstrated.The critical temperature T
c at 1 bar and the critical pressure P
c at T = 343 K have been determined from the normal liquid state.
Received 2 May 2000 |
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Keywords: | 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 |
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