LOW - TEMPERATURE AC MICROCALORIMETER AND POTENTIALITIES OF THE AC TECHNIQUE

The potentialities of ac calorimetry are investigated experimentally a nd theoretically. The effects of the sample-holder and of the heat-lea kage into the wires on the measured temperature-oscillations are discu ssed. It is shown that the effects can lead to incorrect measurements. A proper choice of materials and external parameters enables the cons truction of the calorimeter with sensitivity of about 10(-8) J/K at 5K . The presented calorimeter gives an opportunity to measure the heat-c apacity temperature dependencies in the steady-state mode with a resol ution of about 0.01K in the range 1-300K.