HIGH-RESOLUTION ADIABATIC SCANNING CALORIMETER FOR SMALL SAMPLES

An improved version of a low-temperature double calorimeter for the te mperature range 20-320 K is presented. The temperature of the adiabati c shield is increased at a programmable rate, while the temperature di fferences to the samples are regulated to zero. Temperature control an d data acquisition are achieved by software algorithms integrated in a single computer program. The apparatus yields a typical precision Del ta C-p/C-p of 10(-3) with approximate to 50 data K-1.