Na substitution for La- and Mn-sites in $LaMnO_3$ from alkali halide fluxes: low temperature synthesis, structure and properties

Shivakumara, C and Subbanna, GN and Lalla, NP and Hegde, MS (2004) Na substitution for La- and Mn-sites in $LaMnO_3$ from alkali halide fluxes: low temperature synthesis, structure and properties. In: Materials Research Bulletin, 39 (1). pp. 71-81.

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Abstract

$La_{1-x}Na_xMn_{1-y}Na_yO_3$ (0.12 < x < 0.16;0.04 < y < 0.07) have been synthesized from NaBr and NaI fluxes at relatively low temperature of 850 and $750^o\hspace{2mm}C$, respectively. Final composition of these oxides was obtained from chemical analysis of the elements present. The flux grown oxides crystallize in the rhombohedral structure (space group R-3c, No. 167) and are ferromagnetic metals (FMM). Chemical analysis and Rietveld refinement of X-ray data indicate Na ion is substituted for both La- and Mn-sites in the compound prepared from NaBr and NaI fluxes with 33 and 49% of $Mn^{4+}$ concentration, respectively.

Item Type: Journal Article The copyright of this article belongs to Elsevier. A. Oxides;B. Chemical synthesis;C. X-ray diffraction;D. Magnetic properties Division of Chemical Sciences > Materials Research CentreDivision of Chemical Sciences > Solid State & Structural Chemistry Unit 02 Jun 2006 19 Sep 2010 04:28 http://eprints.iisc.ernet.in/id/eprint/7371