Thermal conductivity of the Ih and XI phases of ice

• The thermal conductivity λ of KOH-doped ice was measured using the transient hot-wire method at temperatures in the range 55–250 K and at pressures up to 0.15 GPa. With an isobaric increase of temperature at 0.08 GPa, λ decreased 17% at about 74 K. This decrease is associated with the known transition from ordered phase XI to phase Ih which exhibits orientational disorder of H2O. A model for λ indicates that the decrease of λ at the transition is due to an increase of the lattice anharmonicity which might be caused by the disorder in phase Ih. It was inferred from the temperature dependence of λ that phonon scattering in both phases Ih and XI is dominated by three phonon umklapp processes. At 58 K, λ of supercooled phase Ih decreased slightly with increasing pressure whereas λ of phase XI was independent of pressure.

Ämnesord

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

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

Nyckelord

Thermal conductivity

high pressure

ice Ih

ice XI

solid H2O

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)