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Preparation and properties of Ba2−xSrxSmTaO6 (x=0–2): a group of new perovskite materials

James, J., Meenakshisundaram, Sankar, Senthil Kumar, S. and Nair, K. V. O. 2004. Preparation and properties of Ba2−xSrxSmTaO6 (x=0–2): a group of new perovskite materials. Materials Chemistry and Physics 83 (2-3) , pp. 328-333. 10.1016/j.matchemphys.2003.10.007

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Abstract

A new group of complex oxide materials were synthesized by the conventional solid state method. These compounds have the general formula Ba2−xSrxSmTaO6 (x=0, 0.5, 1.0, 1.5 or 2) and complex perovskite structures. The compounds belonging to this Ba2−xSrxSmTaO6 group exhibited a regular transition from the ideal cubic structure to a pseudocubic structure as the strontium content is increased. Pure Ba2SmTaO6 gave an ideal cubic perovskite crystal structure of A2(BB′)O6 type, while pure Sr2SmTaO6 was found to have a pseudocubic structure. The unit cell dimensions of these compounds varied from 8.4687 to 8.3232 Å as the amount of Sr (x) in Ba2−xSrxSmTaO6 increased from 0 to 2. The theoretical density of these samples also decreased from 7.6756 to 6.9401 gm/cm3 as the value of x is changed from 0 to 2. All these powders could be sintered to more than 90% theoretical density at 1650 °C in 4 h. These compounds were found to be thermally stable and did not show any phase change. They had dielectric constants in the range 14–18 and the loss factor values were about 2×10−3 at a frequency of 107 Hz. These Ba2−xSrxSmTaO6 ceramics gave moderate values of dielectric constant and loss factor, in the range suitable for use as substrates for superconductors.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
ISSN: 0254-0584
Last Modified: 04 Jun 2017 06:33
URI: http://orca.cf.ac.uk/id/eprint/61949

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