The studies of thermal conductivity in GdVO₄, YVO₄, and Y₃Al₅O₁₂measured by quasi-one-dimensional flash method

Abstract

We have measured thermal conductivity of GdVO(4), YVO(4), and Y(3)Al(5)O(12). In order to avoid the miss leading from three-dimensional (3D) thermal diffusion, we developed the quasi-one-dimensional (q1D) flash method. By taking in account the heat radiation effect in transparent materials for this measurement, YVO(4) was found to have larger thermal conductivity than GdVO(4). The measured thermal conductivities were 12.1, 10.5, 10.1, 8.9, and 8.5 W/mK for c-cut YVO(4), c-cut GdVO(4), YAG, a-cut YVO(4), and a-cut GdVO(4), respectively. The dependence of Nd-conductivity coefficient (dkappa/dC(Nd)) for convenient evaluation of the doping effect in thermal conductivity is also discussed.