Abstract
The heat conductivity of dilute gold-platinum alloys, containing 0.11 and 1.02 at.% Pt, has been measured between 4.2 and 80\ifmmode^\circ\else\textdegree\fi{}K. The influence of vacancies on the lattice heat conductivity ${K}_{g}$ of the alloy with the higher platinum concentration was determined from measurements with specimens which were quenched and subsequently annealed. Above about 30\ifmmode^\circ\else\textdegree\fi{}K, ${K}_{g}$ in the annealed alloy Au+1.02 at.% Pt is found to be about 20% smaller than in pure gold. Whereas the lattice heat conductivity is clearly reduced at higher temperatures by quenched-in vacancies, it is practically unaffected by quenching below about 15\ifmmode^\circ\else\textdegree\fi{}K. The phonon-scattering cross section of vacancies is estimated from the data, assuming a Rayleigh-type scattering law. It is found to be in reasonable agreement with the value obtained earlier from the phonon-drag thermopower of quenched and annealed pure gold.
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