Kumar, Neeraj and Kishan, H. and Rao, A. and Awana, V. P. S. (2010) Fe ion doping effect on electrical and magnetic properties of La0.7Ca0.3Mn1−xFexO3 (0 ≤ x ≤ 1). Journal of Alloys and Compounds, 502 (2). pp. 283-288. ISSN 0925-8388

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Abstract

Here we report the structural, electrical and magnetic properties of Fe doped La0.7Ca0.3Mn1−xFexO3 (LCMFO; 0 ≤ x ≤ 1) prepared by conventional solid state reaction method. Simulated data on XRD shows an increase in volume with an increase in Fe ion concentration. XPS supports that Fe3+ ions directly substitute Mn3+ ions. Shifting towards lower wave number and symmetric IR band structure confirms increase in volume and homogeneous distribution of Fe ions. Fe ion does not contribute in double-exchange (DE) conduction mechanism due to its stable half filled 3d orbital. The presence of Fe3+ ions encourages anti-ferromagnetism (AFM) generated by super-exchange interaction and suppress insulator–metal transition temperature (TIM). Magnetic measurements show the existence of magnetic polarons supported by increase in volume of unit cell and deviation from Curie–Weiss law.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	Manganites; Metal–insulator transition; Super-exchange interaction
Subjects:	Chemistry Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	19 Apr 2012 06:50
Last Modified:	19 Apr 2012 06:50
URI:	http://npl.csircentral.net/id/eprint/160

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