Synthesis dependent characteristics of Sr{sub 1-x}Mn{sub x}TiO{sub 3} (x=0.03, 0.05, 0.07 and 0.09)
- Materials Research Centre, Indian Institute of Science, Bangalore 560012 (India)
- Laboratoire Structures, Proprietes et Modelisation des Solides, Ecole Centrale Paris, CNRS-UMR8580, Grande Voie des Vignes, 92295 Chatenay-Malabry Cedex (France)
Sr{sub 1-x}Mn{sub x}TiO{sub 3} (where x=0.03, 0.05, 0.07 and 0.09) was synthesized via different routes that include solid-state, oxalate precipitation and freeze drying. In oxalate precipitation technique, compositions corresponding to 3 and 5 mol% doping of Mn were monophasic whereas the higher compositions revealed the presence of the secondary phases such as MnO, Mn{sub 3}O{sub 4} etc., as confirmed by high resolution X-ray diffraction (XRD) studies. The decomposition behavior of the precursors prepared using oxalate precipitation method corresponding to the above mentioned compositions was studied. Nanopowders of compositions pertaining to 5 to 9 mol% of Mn doping were obtained using freeze-drying technique. The average crystallite size of these nanopowders was found to be in the 35 to 65 nm range. The microstructural studies carried out on the sintered ceramics, fabricated using powders synthesized by different routes established the fine grained nature (<1 {mu}m) of the one obtained by freeze drying method. Raman scattering studies were carried out in order to complement the observations made from XRD regarding the phase purity. The dielectric properties of the ceramics obtained by different synthesis routes were studied in the 80-300 K temperature range at 100 kHz and the effect of grain size has been discussed. - Graphical abstract: XRD patterns of Sr{sub 1-x}Mn{sub x}TiO{sub 3} (x=0.03 and 0.05) obtained by oxalate precipitation technique along with that of the nanopowders for x=0.05, 0.07 and 0.09 obtained by freeze drying method, microstructural characterization and synthesis dependent dielectric behavior. Highlights: Black-Right-Pointing-Pointer Monophasic samples obtained for compositions Sr{sub 1-x}Mn{sub x}TiO{sub 3} with x=0.03 and 0.05. Black-Right-Pointing-Pointer Nanopowders of Sr{sub 1-x}Mn{sub x}TiO{sub 3} with x=0.05, 0.07 and 0.09 were synthesized by freeze-drying method. Black-Right-Pointing-Pointer Phase purity of samples synthesized using freeze drying method were studied at different sintering temperatures. Black-Right-Pointing-Pointer Analysis of Raman spectra for samples prepared by both oxalate precipitation and freeze-drying. Black-Right-Pointing-Pointer Microstructure dependent dielectric characteristics have been illustrated.
- OSTI ID:
- 22131135
- Journal Information:
- Journal of Solid State Chemistry, Vol. 192; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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