Influence of crystallite size on the thermal conductivity in BaTiO3 nanoceramics

Abstract

The grain size effect on the thermal conductivity in BaTiO3 nanoceramics was investigated. The nanoceramics were produced by the low temperature high pressure technique. The averaged sizes of grain varied from 30to100nm. It was found that the thermal conductivity of BaTiO3 nanoceramics decreased with decreasing the grain sizes. For the smallest grains the thermal conductivity was similar to the glasslike materials, whereas for larger grains it behaved as in crystalline dielectrics.