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Low-temperature polymer precursor-based synthesis of nanocrystalline particles of lanthanum calcium manganese oxide (La0.67Ca0.33MnO3) with enhanced ferromagnetic transition temperature

Published online by Cambridge University Press:  01 January 2006

K. Shantha Shankar  and
A.K. Raychaudhuri
K. Shantha Shankar
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore 560098, India
A.K. Raychaudhuri*
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore 560098, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We report a simple modified polymeric precursor route for the synthesis of highly crystalline and homogenous nanoparticles of lanthanum calcium manganese oxide (LCMO). The LCMO phase formation was studied by thermal analysis, x-ray powder diffraction, and infrared spectroscopy at different stages of heating. These nanocrystallites (average particle size of 30 nm) possess ferromagnetic–paramagnetic transition temperature (Tc) of 300 K, nearly 50 K higher than that of a single crystal. The Rietveld analysis of the powder x-ray diffraction data of the nanopowders reveals significant lattice contraction and reduction in unit cell anisotropy-these structural changes are correlated to the enhancement in Tc.

Keywords

Crystallographic structureNanoparticleSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 27 - 33
Copyright
Copyright © Materials Research Society 2006

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