Vibrational and thermal properties of pressure polymerized C60

• The kinetics of C60 polymerization were studied in the temperature range 450-500 K at pressures below 1 GPa by measurements of the time dependence of the thermal conductivity. The vibrational spectrum of polymerized C60 was studied by inelastic neutron scattering. We find drastic changes in the spectrum compared with the vibrational spectrum of pristine C60: hardening of intermolecular modes, appearance ofa new broad vibrational band at low energies, splitting and significant changes in the peak positions of intramolecular modes. The thermal conductivity, lambda, of polymerized C60 was measured in the temperature range 150-320 K and was found to increase with rising temperature, that reflects strong phonon scattering. The presence of polymeric chains of different length and a high degree of structural disorder in the crystalline lattice of the polymeric phase are the most probable factors responsible for the glass-lika behaviour of lambda(T).

Ämnesord

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

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

Nyckelord

Fullerenes

C60

fullerene polymers

high pressure synthesis

high pressure

thermal conductivity

inelastic neutron scattering

glass-like properties

Condensed matter physics

Kondenserade materiens fysik

fysik

Physics

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)