Abstract
This paper presents a method for investigating structural relaxation by the measurements of specific heat, thermal diffusivity, and thermal conductivity. The relaxation effects are demonstrated on a composite based on carbon. A model for the investigated material is suggested. The material consists of regions which are in equilibrium state and regions which are in nonequilibrium state. The transition to the equilibrium state is manifested by reduction in the anharmonic effects and by chemical reactions. The contradictory behavior of the thermal diffusivity above room temperature is discussed.
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References
S. M. Rekhson, J. Non-Cryst. Solids 84:68 (1968).
O. V. Mazurin, J. Non-Cryst. Solids 87:392 (1968).
Ľ. Kubičár, in Proc. Second Int. Conf. Metal. Mater., Smolenice, May 22–26, 1989, P. Duhaj, P. Mrafko, and P. Švec, eds. (Trans Tech, Switzerland-Germany-UK-USA, 1990), p. 165.
J. Krempaský, Cs. cas. fyz. B12:353 (1962).
Ľ. Kubičár, Pulse Method of Measuring Basic Thermophysical Parameters (Elsevier, Amsterdam; Veda, Bratislava, 1990).
Ľ. Kubičár and J. Spišiak, High Temp. High Press. 20:619 (1988).
W. A. Phillips, Amorphous Solids at Low Temperatures (Springer, New York, 1981), p. 160.
G. Grimvall, Thermophysical Properties of Materials (Noth-Holland, Amsterdam, 1986).
W. Neumann and A. Hallen, in Thermal Conductivity 20, D. P. H. Hasselman and J. R. Thomas, Jr., eds. (Plenum Press, New York, 1989), p. 71.
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Spišiak, J., Kubičár, Ľ. & Křivánková, D. Thermophysical investigation of structural relaxation. Int J Thermophys 12, 593–601 (1991). https://doi.org/10.1007/BF00502372
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DOI: https://doi.org/10.1007/BF00502372