Articles
All articles | Recent articles
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.
Download Full Article (PDF)
Keywords
Titanium dioxide, TiO2, tin dioxide, SnO2, TiO2-SnO2, phase separation, ceramic, thermal conductivity
References
1 Harper, C.A. (ed.): Handbook of ceramics, glasses and diamonds. McGraw-Hill, New York, 2001.
2 Miura, M., Yogo, T., Hirano, S.I.: Phase separation and toughening of SiC-AlN solid-solution ceramic, J. Mater. Sci., 28, 3859 – 3865, (1993).
3 Knutsson, A., Johansson, M.P., Karlsson, L., Odén, M.: Thermally enhanced mechanical properties of arc evaporated Ti0.34Al0.66N/TiN multilayer coatings, J. Appl. Phys., 108, 044312:1 – 044312:7, (2010).
4 Gorsse, S., Bauer Pereira, P., Decourt, R., Sellier, E.: Microstructure engineering design for thermoelectric materials: An approach to minimise thermal diffusivity, Chem. Mater., 22, [3], 988 – 993, (2010).
5 Park, M.W., Mitchell, T.E., Heuer, A.H.: Subsolidus equilibria in the TiO2-SnO2 system, J. Am. Ceram. Soc., 58, 44 – 47, (1975).
6 Chaisan, W., Yimnirun, R., Ananta, S., Cann, D.P.: The effects of the spinodal microstructure on the electrical properties of TiO2-SnO2 ceramic, J. Solid State Chem., 178, 613 – 620, (2005).
7 Dynys, F.W., Berger, M.H., Sehirlioglu, A.: Thermoelectric properties of undoped and doped (Ti0.75Sn0.25)O2, J. Am. Ceram. Soc., 95, 619 – 626, (2012).
8 Etacheri, V., Seery, M.K., Hinder, S.J., Pillai, S.C.: Oxygen rich titania: A dopant free, high temperature stable, and visible-light active anatase photocatalyst, Adv. Funct. Mater., 21, 3744 – 3752, (2011).
9 Fu, G., Yang, Y., Wei, G., Shu, X., Qiao, N., Deng, L.: Influence of Sn doping on phase transformation and crystallite growth of TiO2 nanocrystals, J. Nanomater., 2014, [1], 835450:1 – 5, (2014).
10 Park, M.W., Mitchell, T.E., Heuer, A.H.: Decomposition of TiO2-SnO2 solid solutions, J. Mater. Sci., 11, 1227 – 1238, (1976).
11 Fayette, S., Smith, D.S., Smith, A., Martin, C.: Influence of grain size on thermal conductivity of tin oxide ceramics, J. Eur. Ceram. Soc., 20, 297 – 302, (2000).
12 Samsonov, G.V.: The oxide handbook, IFI/Plenum Press, New York, 1982.
Copyright
Göller Verlag GmbH
