Abstract
The temperature dependence of the thermal expansion ΔL/L of samples of high-density nanostructural CuO ceramics with a crystallite size of 20, 70, and 90 nm was measured. The nanoceramics were obtained from coarse-grained CuO powders under converging spherical shock waves. It is found that, at temperatures T > 50 K, the thermal expansion coefficient α(T) of the nanoceramic samples increases with decreasing crystallite sizes and exceeds the value of α(T) of the CuO single crystal by a factor of 3.5 to 4.5. At temperatures T < 50 K, regions with zero and negative values of α(T) were revealed. The possible reasons for the increase in the thermal expansion coefficient of nanoceramics based on 3d-metal oxides are discussed.
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Original Russian Text © I.B. Krynetskiĭ, B.A. Gizhevskiĭ, S.V. Naumov, E.A. Kozlov, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 4, pp. 723–725.
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Krynetskiĭ, I.B., Gizhevskiĭ, B.A., Naumov, S.V. et al. Size effect of the thermal expansion of nanostructural copper oxide. Phys. Solid State 50, 756–758 (2008). https://doi.org/10.1134/S1063783408040264
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DOI: https://doi.org/10.1134/S1063783408040264