THERMAL CONDUCTIVITY OF SINGLE CRYSTAL PLATES OF TYPES Ib AND IIa, OBTAINED BY THE T-GRADIENT METHOD AT HPHT CONDITIONS

Abstract

With the help of devices for measuring thermal conductivity IT-02Ts, the principle of which is based on the contact method, including pulsed heating of the sample followed by its cooling to the initial temperature, and LFA-427, which operates on the basis of the laser flash method (laser pulse method), the thermal conductivity plates of type Ib and IIa diamond single crystals obtained by the T-gradient method under HPHT conditions, was determined. The data obtained correlate well with the results obtained earlier by other researchers. Thus, the use of a single crystal of diamond Ib as a standard alongside to copper, aluminum and other materials will make it possible to make a calibration graph, which will make it possible to carry out express measurements of thermal conductivity on the IT-02Ts device in a wide range of thermal conductivity values.