Preparation and Characterization of Barium
Strontium Titanate Ceramics by Gel- Combustion Technique.

Abstract

Barium Strontium Titanate (Ba0.8Sr0.2TiO3) has been prepared and characterized in this present study. BST phase pure powder has been prepared following combustion synthesis technique and the sol-gel route. Citric acid and ethylene glycol have been used as a fuel in this combustion process. Use of ammonia solution to maintain the pH 7 is a must requirement. EDTA is the chelating agent with helps in the complex formation before gel formation in the combustion process. Preparation of titanium oxy-nitrate is the integral part of all the synthesis procedure. Bulk ceramic samples are prepared following the combustion technique while thin films are prepared by sol gel route and dip coating technique. X-ray diffraction of the bulk and coated substrates are done. The densification behavior and densification kinetics of the BST powder has also been studied. Powder morphology and microstructure of sintered BST bulk samples and the thick films was determined. Dielectric behavior of BST samples has also been studied as a function of frequency at room temperature.