Temperature, heat and heat flow calibration of dynamic calarimeters duringcooling

The current publication continues the series of recommendations of the ,,Ca libration" Working Group of the German Society for Thermal Analysis (GEFTA) for temperature, heat and heat flow rate calibration of scanning calorimet ers. It deals with calibration in the cooling mode. The procedures to be ap plied are essentially identical to those applied in the heating mode. Due t o the general occurrence of supercooling for first-order phase transitions during cooling, liquid crystals and substances with higher-order phase tran sitions are recommended for temperature calibration. Substances with weak s upercooling or substances for which the temperature dependence of the trans formation enthalpy is known are recommended for heat calibration. The therm odynamic fundamentals relevant to the temperature dependence of phase trans ition enthalpies and phase transition temperatures are discussed. Detailed examples make it easy to follow the recommendations.