Dielectric relaxation and new phase of cyclooctanol at pressures to 1 GPa

• On the four previously known solid phases of cyclooctanol (I, II, IV and V in our notation), two (IV and V) are stable only at high pressure. In this work, new data on dynamic dielectric properties of cyclooctanol at high pressure are presented. The results are compared with corresponding thermal conductivity data. It is concluded that the dielectric properties of phase II are consistent with the thermal conductivity properties if it is assumed that a substantial fraction of the dipoles interact with each other. The molecular interaction favours reorientation around an axis of negligible dipole moment. The new solid phase, phase III, which was discovered through thermal conductivity measurements, is detected dielectrically in the present study.

Ämnesord

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

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

Nyckelord

Dielectric properties

dielectric relaxation

high pressure

cyclooctanol

phase diagram

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)