Low temperature molten-salt synthesis of nanocrystalline cubic Sr2SbMnO6

Baral, Antara and Varma, KBR (2009) Low temperature molten-salt synthesis of nanocrystalline cubic Sr2SbMnO6. In: Journal of solid state chemistry, 182 (12). pp. 3282-3288.

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Abstract

Sr2SbMnO6 (SSM) powders were successfully synthesized at reasonably low temperatures via molten-salt synthesis (MSS) method using eutectic composition of 0.635 Li2SO4-0.365 Na2SO4 (flux). High-temperature cubic phase SSM was stabilized at room temperature by calcining the as-synthesized powders at 900 degrees C/10 h. The phase formation and morphology of these powders were characterized via X-ray powder diffraction and scanning electron microscopy, respectively. The SSM phase formation associated with similar to 60 nm sized crystallites was also confirmed by transmission electron microscopy. The activation energy associated with the particle growth was found to be 95 +/- 5 kJ mol(-1). The dielectric constant of the tetragonal phase of the ceramic (fabricated using this cubic phase powder) with and without the flux (sulphates) has been monitored as a function of frequency (100 Hz-1 MHz) at room temperature. Internal barrier layer capacitance (IBLC) model was invoked to rationalize the dielectric properties.

Item Type:	Journal Article
Publication:	Journal of solid state chemistry
Publisher:	Elsevier Science
Additional Information:	copyright of this article belongs to Elsevier Science.
Keywords:	Cubic phase;Molten-salt synthesis;Sulphate flux;Ceramic; Dielectric properties.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	09 Jan 2010 11:06
Last Modified:	19 Sep 2010 05:54
URI:	http://eprints.iisc.ac.in/id/eprint/25307

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