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Low temperature synthesis and characterization of rare earth orthoferrites $LnFeO_3$ (Ln = La, Pr and Nd) from molten NaOH flux

Shivakumara, C (2006) Low temperature synthesis and characterization of rare earth orthoferrites $LnFeO_3$ (Ln = La, Pr and Nd) from molten NaOH flux. In: Solid State Communications, 139 (4). pp. 165-169.

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Abstract

Rare earth orthoferrites of the general formula $LnFeO_3$ (Ln = La, Pr and Nd) phases have been synthesized for the first time in molten NaOH flux at a temperature as low as $400^oC$. The flux-grown oxides were characterized by XRD, SEM, EDX, FT-IR and temperature dependent electrical resistivity measurements. The crystal structures of these materials have been refined by the Rietveld profile analysis method using powder XRD data. All these oxides crystallize in the orthorhombic structure (space group Pbnm, no.62) and exhibit insulating behavior. As-synthesized samples show three active IR absorption bands for Fe–O stretching vibration $(\vartheta_1\hspace{2mm} mode)$ and O–Fe–O deformation vibration $(\vartheta_2\hspace{2mm}mode)$. In the KOH flux on the other hand, no product formation is observed, thus providing evidence for the differences in the two alkali fluxes.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: A. LaFeO3;A. Perovskite oxides;B. Chemical synthesis;C. Crystal structure;C. Powder X-ray
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 18 Sep 2006
Last Modified: 19 Sep 2010 04:31
URI: http://eprints.iisc.ernet.in/id/eprint/8573

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