The glass transition of Pd40Ni10Cu30P20 studied by temperature-modulated calorimetry

The frequency dependence of the heat capacity in the glass-transition regio n of Pd40Ni10Cu30P20 was studied by temperature-modulated differential scan ning calorimetry (TMDSC during slow heating and cooling. Such data for low frequencies between 0.1 and 0.01 Hz are not available, especially for metal lic glasses. A crossover between mixed static/dynamic and purely dynamic re sponse signals was observed for the lowest frequencies between 1/80 and 1/1 00 s(-1) which allows a direct determination of the average relaxation time at a given cooling rate during the static glass transition. Further, these results were used to evaluate the experimental parameters necessary to tru ly separate the static and dynamic response in low-frequency modulation cal orimetry experiments to obtain the moduli of the dynamic specific heat. (C) 1999 Published by Elsevier Science B.V. All rights reserved.