Abstract
Measurement techniques of thermal diffusivity of rocks and minerals at high pressures and temperatures have been developed. The technique utilizes the Angstrom method. Samples as small as several millimeters in linear dimension can be measured. The methods were tested on quartz, fused silica, basalt, and serpentinized peridotite. Linear and cylindrical sample geometries are tested. It is found that, for relatively opaque samples, the cylindrical sample geometry is most suitable for measurements at high pressures. The linear sample geometry is adequate for measurements of small samples at moderately high temperatures.
