METHOD FOR MEASURING THERMAL CONDUCTIVITY OF SOLIDS UNDER CONDITIONS OF HEAT EXCHANGE WITH THE ENVIRONMENT AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC G01N25/18 

FIELD: experimental solid state physics.

SUBSTANCE: invention is related to methods and devices for determining the thermal conductivity of solids in the isotropic direction in a stationary heat flow, in presence of a temperature gradient along the flow in sections orthogonal to it, under conditions of a known steady-state heat exchange with the environment. 3 methods and 2 devices are proposed. It is possible to organize in the samples a directed stationary heat flow from the heater to the receiver, but in practice, when calculating according to the well-known Fourier law for thermal conductivity, the thermal conductivity coefficient will be overestimated if the coefficient of heat exchange with the environment of the heater-sample-cooler system in form of a multiplier is not taken into account, which is measured every time for each specific sample during the experiment as the ratio of the heat power received by the refrigerator J_X and transferred from the heater J_H.

EFFECT: increasing the accuracy of determining the thermal conductivity coefficient, in reducing the measurement time, in increasing the speed in the heating/cooling transition sections in the measurement mode with negative current feedback, and also in reducing the influence of the sample temperature and accompanying convection flows on the measurements.

9 cl, 2 dwg