Experimental setup for measuring the isobaric thermal conductivity of molecular crystals

Abstract

The paper describes an experimental setup for the measurement of the isobaric thermal conductivity of molecular crystals in the temperature range from 80 K to 300 K. A scheme of the developed experimental setup for measuring the thermal conductivity by the linear-flow steadystate method under saturated vapor pressures has been presented. A modified heat potentiometer method with one thermometer was used, which allowed us to minimize the error in the estimation of the thermal conductivity due to the uncontrollable heat flows and different calibration of thermometers. The noncontrollable heat flows from thermal radiation were reduced considerably with a radiation shield on which the temperature field of the measuring cell was reproduced using a set of thermocouples and precision heat controllers. The total systematic error in the measurement of the thermal conductivity does not exceed 5%.