Investigation of Ba2−xSrxTiO4: structural aspects and dielectric properties

Shanker, Vishnu ; Ahmad, Tokeer ; Ganguli, Ashok K. (2004) Investigation of Ba2−xSrxTiO4: structural aspects and dielectric properties Bulletin of Materials Science, 27 (5). pp. 421-427. ISSN 0250-4707

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Investigation of solid solution of barium-strontium orthotitanates of the type, Ba2−x Sr x TiO4 (0 ≤x≤ 2), show that pure phases exist only for the end members, Ba2TiO4 and Sr2TiO4, crystallizing in the β-K2SO4 and K2NiF4 structures, respectively. The intermediate compositions (till≥ 1) lead to a biphasic mixture of two Ba2TiO4-type phases (probably through a spinodal decomposition) with decreasing lattice parameters, indicating Sr-substitution in both the phases. For x > 1, Sr2TiO4 along with a secondary phase is obtained. The dielectric constant and dielectric loss were found to decrease with Sr substitution till the nominal composition of x = 1. However, pure Sr2TiO4 shows higher dielectric constant compared to the solid solution composition. Sr2TiO4 shows very high temperature stability of the dielectric constant.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Ceramics; Solid Solution; Dielectric Properties; Electron Microscopy
ID Code:61976
Deposited On:16 Sep 2011 03:50
Last Modified:18 May 2016 11:27

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