Laser-Flash Diffusivity Measurement of Diamond Films

A laser-flash technique with fast infrared detection for the measurement of the normal diffusivity of samples, with a thickness in the range 200 to 700 um, is preseInted. The experimental apparatus for such a measurement is described. Some points specific to the diffusivity measurement of semi-transparent and highly conductive materials such as diamond are discussed. Particularly, difficulties in connection with the good conductivity and low thickness of the samples we consider are poiInted out. Finally, experimental results performed within the framework of the Diamond Round Robin 2 tests for both nondiamond and diamond films are preseInted and the influence of the coupled conductiveradiative heat transfer is shown.