Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/96675
Title: Frequency dependence of heat capacity of the Pd40Ni10Cu30P20 amorphous alloy by temperature-modulated calorimetry
Authors: Hu, X.
Li, Y. 
Ng, S.C. 
Feng, Y.P. 
Issue Date: 2000
Citation: Hu, X.,Li, Y.,Ng, S.C.,Feng, Y.P. (2000). Frequency dependence of heat capacity of the Pd40Ni10Cu30P20 amorphous alloy by temperature-modulated calorimetry. Physical Review B - Condensed Matter and Materials Physics 62 (5) : 3169-3175. ScholarBank@NUS Repository.
Abstract: The newly developed temperature-modulated differential scanning calorimetry (DSC) has been used to investigate the frequency dependence of heat capacity in the glass transition region for the Pd40Ni10Cu30P20 alloy upon heating and cooling. In contrast to conventional DSC results, the present work showed a dissipative behavior of the heat-flow response of the deeply supercooled Pd40Ni10Cu30P20 liquid in the glass transition region, qualitatively similar to the results obtained by specific heat spectroscopy on glycerol. A strong dependence of the temperature modulation period on the temperature of the peak imaginary part of complex heat capacity, Tmax, was found indicating a slowdown of the supercooled liquid dynamics as temperature decreased. This frequency dependence of Tmax can be well described by either the Arrhenius law or the Vogel-Fulcher-Tamman (VFT) equation. Furthermore, the VFT fit to the experimental data showed that the VFT temperature T0 was coincident with the thermodynamically determined Kauzmann temperature TK. The average characteristic time of enthalpy relaxation was determined to be approximately 50 s at 579 K and the apparent activation energy of glass transition was estimated to be 577±22kJ/mol. ©2000 The American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/96675
ISSN: 01631829
Appears in Collections:Staff Publications

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