Measurements of the thermophysical properties of V₂O₅ pellets
by Hyunki Kim; Soo Yeol Jeong; Yeon Suk Choi; Sok Won Kim
International Journal of Nanotechnology (IJNT), Vol. 16, No. 4/5, 2019

Abstract: The thermal properties of V₂O₅ and W_0.04V₂O₅ pellets with α-V₂O₅ phase were investigated by measuring the specific heat and thermal diffusivity. Near 150°C, the specific heats of both pellets increased remarkably due to the metal-insulator transition (MIT) reported in α-V₂O₅ thin films. In thermal diffusivity measurement, neither pellet showed a remarkable change in terms of strong electron-phonon interaction. The thermal diffusivity of the V₂O₅ pellet was about 20% larger than that of the W_0.04V₂O₅ pellet due to the increase of surface defects of the nanospheres and the boundaries between them. The thermal conductivities of the V₂O₅ and W_0.04V₂O₅ pellets calculated using thermal diffusivity and specific heat clearly revealed a remarkable change near 150°C. Over the whole temperature range, the thermal conductivity of the V₂O₅ pellet was larger than that of W_0.04V₂O₅, due to the thermal diffusivity. Above 150°C, the electronic thermal conductivity showed a significant increase in both pellets, which was attributed to the MIT in the V₂O₅ and W_0.04V₂O₅ pellets, and the transition temperatures (T_c) of the pellets were 200 and 180°C, respectively.

Online publication date: Mon, 13-Jan-2020

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