Volume 11, Number 4 (Iranian Journal of Physics Research, Winter 2012)                   IJPR 2012, 11(4): 371-377 | Back to browse issues page

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Rabani H, Mardaani M, Keshavarz M. The effect of elastic and structural parameters on phonon transport and thermal properties of a simple cubic nanocrystal. IJPR. 2012; 11 (4) :371-377
URL: http://ijpr.iut.ac.ir/article-1-892-en.html

Shahrekord University
Abstract:   (11209 Views)
In this paper, we study the phonon and thermal properties of a nanocrystal by using transfer matrix method in the harmonic approximation. The considered system is a mass-spring nanocrystal with a square cross section. At first, for the ideal case, we obtain the phonon spectrum with free boundary conditions. Then we calculate some phonon transport properties of this system, namely, the phonon density of states (modes) and transmission coefficient under different physical and structural conditions. Finally, in the presence of a linear temperature gradient, we obtain the system’s thermal conductivity. The results show that the variation in values of physical and structural parameters causes the phonon system properties to strongly change. For example, by decreasing or increasing the typical band frequency of the system, the phonon transmission coefficient increases or decreases, respectively. Moreover, for a mass periodic (for sequential layers) nanocrystal embedded between the two ideal nanocrystals the thermal conductivity decreases with respect to the ideal case.
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Type of Study: Research | Subject: general

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