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Influence of Phase Separation on Thermal Conductivity of Ti1-xSnxO2 Ceramics
K. Rubenis, J. Locs, J. Mironova, R. Merijs-Meri
Riga Technical University, Faculty of Material Science and Applied Chemistry, Institute of General Chemical Engineering, Paula Valdena St. 3, LV-1048, Riga, Latvia
received September 15, 2015, received in revised form October 29, 2015, accepted November 3, 2015
Vol. 7, No. 1, Pages 135-138 DOI: 10.4416/JCST2015-00061
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.
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Keywords
Titanium dioxide, TiO2, tin dioxide, SnO2, TiO2-SnO2, phase separation, ceramic, thermal conductivity
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