Simple oxalate precursor route for the preparation of barium-strontium titanate: Ba{sub 1-x}Sr{sub x}TiO{sub 3} powders
- Department of Physics, University of Pune, Pune-411 007 (India)
- Physical and Materials Chemistry Division, National Chemical Laboratory, Pune-411 008 (India)
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): Ba{sub 1-x}Sr{sub x}TiO(C{sub 2}O{sub 4}){sub 2}.4H{sub 2}O (x=0.25) precursor powders with nearly theoretical yield ({>=}99%). The pyrolysis of BSTO at 730 deg. C/4 h in air produced barium-strontium titanate (Ba{sub 1-x}Sr{sub x}TiO{sub 3}; 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-gravimetric 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 1300 deg. C/4 h showed density {approx}95%, dielectric constant {epsilon}(Tc){approx}9500, tan {delta}{approx}0.15% and T{sub C}{approx}32 deg. C.
- OSTI ID:
- 20748656
- Journal Information:
- Materials Characterization, Vol. 54, Issue 1; Other Information: DOI: 10.1016/j.matchar.2004.11.002; PII: S1044-5803(04)00253-0; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM
BARIUM HYDROXIDES
CERAMICS
ION EXCHANGE
OXALATES
PERMITTIVITY
POWDERS
PRECIPITATION
PRECURSOR
PYROLYSIS
SCANNING ELECTRON MICROSCOPY
SINTERING
SOLUTIONS
STOICHIOMETRY
STRONTIUM
STRONTIUM NITRATES
THERMAL GRAVIMETRIC ANALYSIS
TITANATES
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS