Application of the many-body theory of Dissado and Hill to the complex permittivity of 1,2,4-butanetriol at pressures to 1 GPa

• The dielectric relaxation of 1,2,4-butanetriol in its supercooled liquid state has been studied at pressures up to 1 GPa. The frequency of the applied field is varied within the range from 1 mHz to 10 MHz. The automated and computer controlled dielectric spectroscopy measuring system is presented in detail. It is found that neither the dielectric relaxation spectra nor the static susceptibility can be accurately described within the theoretical framework which only considers the behaviour of non-interacting dipoles. Instead, the dielectric loss is described by the many-body correlated cluster theory of Dissado and Hill (1983). A relationship between the correlation parameters and the static susceptibility is discussed. The results are compared with previous findings on the homologues glycerol and 1,2,6-hexanetriol.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Permittivity

susceptibility

dielectric relaxation

high pressure

1

2

4-butanetriol

supercooled liquid

glycerol

1

2

6-hexanetriol

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)