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Heat Transfer in Transparent YAG Nanoceramic

J. Mucha, A. Chuchmała, D. Hreniak, A. Jeżowski, W. Strek

Journal of Ceramic Science and Technology, Vol. 2, No. 3 (2011), pp. 179-182

DOI: 10.4416/JCST2011-00014

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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.

Keywords

Ceramics, amorphous materials, nanostructures, thermal conductivity, YAG

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