John Berchmans, L. and Angappan, S. and Visuvasam, A. and Ranjith Kumar, K.B. (2008) Preparation and characterization of LaAI03. Materials Chemistry and Physics, 109 (1). pp. 113-118. ISSN 0254-0584

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Abstract

Lanthanum aluminate has been prepared by combustion synthesis proc S' using nitrate salts of lanthanum and aluminium as cation precursors and urea as the fuel. The powder density and the compacted pellet density have been determined. Sintering proc' s reduces the porosity of the pellets by the agglomeration proc~ s. ThL' conductivity of LaAIO, increases with sintering temperature and the value is found to be 1.75 Scm-1 at 1000" . he diekclJic constant and loss tangent values are found to decrease with the applied frequency. This may be du' to the change in orientation and ionic effects rcsulted frum the inertia of ions and molecular levels. The XRD studies reveal that the material is as igned to be a pselldocubic structure. The FTIR spectra show the higher frequency and lower frequency bands arc assigned to AI01> octahedra in LaAIO,. S M micrographs divulge the presence of platelet aggregates into globular mass with larger surface area. The electrochemical polarization was performed for a synthesized and sintered LaAI01 materials in 0.5-2.0 M KOR In general the corrosion kinetic parameters elucidate the fact that the green samples are found to be prone to corrosion than the sintered materials

Item Type:	Article
Uncontrolled Keywords:	Ceramics; Chemical synthesis; Powder diffraction; Electrochemical properties
Subjects:	Electropyrometallurgy
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	31 Mar 2012 11:24
Last Modified:	31 Mar 2012 11:24
URI:	http://cecri.csircentral.net/id/eprint/415

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