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Influence of Phase Separation on Thermal Conductivity of Ti_1-xSn_xO₂ Ceramics

K. Rubenis, J. Locs, J. Mironova, R. Merijs-Meri

Journal of Ceramic Science and Technology, Vol. 7, No. 1 (2016), pp. 135-138

DOI: 10.4416/JCST2015-00061

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Abstract

Many technologically important ceramic materials are made of more than one component. If components are isostructural they can form a stable or a metastable solid solution that can undergo phase separation below a critical temperature, which can significantly affect different properties of the material. In this work, we investigated the effect of phase separation on thermal conductivity at room temperature of Ti1-xSnxO2 ceramic with different Ti/Sn ratios. The samples were sintered at 1500 °C and afterwards annealed at 1100 °C for 48 h in order to induce phase separation. It was observed that substitution of Ti with Sn and vice versa considerably reduces the thermal conductivity of the parent phases (TiO2 and SnO2). The thermal conductivity of the samples with compositions inside the spinodal region after annealing increased compared with that of samples that had not been annealed while for the compositions outside the spinodal region, only a limited effect was observed.

Keywords

Titanium dioxide, TiO2, tin dioxide, SnO2, TiO2-SnO2, phase separation, ceramic, thermal conductivity

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