Simple oxalate precursor route for the preparation of barium-strontium titanate: Ba1-xSrxTiO3 powders
| Title | Simple oxalate precursor route for the preparation of barium-strontium titanate: Ba1-xSrxTiO3 powders |
| Publication Type | Journal Article |
| Year of Publication | 2005 |
| Authors | Khollam, YB, Deshpande, SB, Potdar, HS, Bhoraskar, SV, Sainkar, SR, Date, SK |
| Journal | Materials Characterization |
| Volume | 54 |
| Issue | 1 |
| Pagination | 63-74 |
| Date Published | JAN |
| Type of Article | Article |
| ISSN | 1044-5803 |
| Keywords | barium-strontium titanate, barium-strontium titanyl oxalate, permittivity, XRF |
| Abstract | A simple one-step cation-exchange reaction between the stoichiometric solutions of ammonium titanyl oxalate (ATO) and barium hydroxide+strontium nitrate at room temperature (RT) is investigated successfully for the quantitative precipitation of barium-strontium titanyl oxalate (BSTO): Ba1-xSrxTiO(C2O4)(2).4H(2)O (x=0.25) precursor powders with nearly theoretical yield (greater than or equal to99%). The pyrolysis of BSTO at 730degreesC/4 h in air produced barium-strontium titanate (Ba1-xSrxTiO3; BST) powders. The characterization studies on BSTO and BST powders by using various physico-chemical techniques: micro- and chemical analysis, differential thermal analysis (DTA)/thermo-gavimetric analysis (TGA), XRD, FTIR, X-ray fluorescence (XRF) and scanning electron microscopy (SEM) revealed that the powders formed are cubic, highly pure, stoichiometric and sub-micron-sized with nearly uniform size and shape distribution. The ceramic compacts obtained by sintering the BST pellets at 1300degreesC/4 It showed density similar to95%, dielectric constant epsilon(Tc)similar to9500, tan delta-0.15% and T(C)similar to32 degreesC. (C) 2004 Elsevier Inc. All rights reserved. |
| DOI | 10.1016/j.matchar.2004.11.002 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 2.383 |