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Heat Transfer in Transparent YAG Nanoceramic
J. Mucha1, A. Chuchmała2, D. Hreniak1, A. Jeżowski1, W. Strek1
1 Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50 – 950 Wroclaw, Poland;
2 Institute of Electrical Engineering Fundamentals (I7), Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50 – 370 Wroclaw, Poland;
received March 19, 2011, received in revised form May 6, 2011, accepted June 7, 2011
Vol. 2, No. 3, Pages 179-182 DOI: 10.4416/JCST2011-00014
Abstract
Thermal conductivity in transparent YAG nanoceramic was measured with the LTHP method in the temperature range 4 – 300 K. It was found that the thermal conductivity of nanoceramics with an average grains size of 16 nm was much lower compared to YAG crystal and polycrystalline ceramics composed of micro-size grains. The results were discussed in terms of the Kapitza resistance model. At about 200 K, Kapitza resistance becomes negative, which indicates a connection with apparent negative thermal conductivity.
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Keywords
Ceramics, amorphous materials, nanostructures, thermal conductivity, YAG
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