Reduction of thermal conductivity in porous ‘gray’ materials

APL Mat. 2, 076107 (2014).

Roland H. Tarkhanyan and Dimitris Niarchos.

Institute for Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, Department of Materials Science, NCSR Demokritos, Athens 15310, Greece.



The reduction in lattice thermal conductivity (LTC) of porous materials is investigated in “gray medium” approximation. Four different models of thermoelectric materials are examined including model with randomly distributed hollow pores of varying diameter from nano- to micro-scale sizes. In all cases we have suggested simple and general relations for the LTC taking into account pore size effect.


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