Abstract
The thermal diffusivity of single crystal quartz, fused quartz and polycrystalline quartz have been measured at temperatures up to 700°C and pressures up to 33kb. The Ångström method has been proved to be applicable to the high pressure experiment, in which the sample was surrounded with solid pressure medium, by comparing the present results on fused quartz with those previously determined by various workers. The pressure derivative of thermal diffusivity for single crystal quartz at room temperature was 5.6×10-4 cm2 sec-1 kb-1 in the direction parallel to the C axis and 3.1×10-4 cm2 sec-1 kb-1 in the direction perpendicular to the C axis, while the value for polycrystalline quartz was 4.5×10-4 cm2 sec-1 kb-1. The pressure dependence of thermal diffusivity for single crystal quartz was also calculated based on the lattice model and the result was found to agree fairly well with the experimental results.
