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Structural and magnetic properties of La0.72(Ca1−xSrx)0.28MnO3 (x = 0 to 1) manganites

Published online by Cambridge University Press:  31 January 2011

M.P. Gutiérrez ,
J.H. Olivares ,
I. Betancourt  and
F. Morales
M.P. Gutiérrez*
Affiliation:
Facultad de Ingeniería, Universidad Anáhuac, México Norte, México 52786
J.H. Olivares
Affiliation:
Facultad de Ingeniería, Universidad Anáhuac, México Norte, México 52786
I. Betancourt
Affiliation:
Facultad de Ingeniería, Universidad Anáhuac, México Norte, México 52786
F. Morales
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, México D.F. 04510
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Polycrystalline manganites within the compositional variation La0.72(Ca1−xSrx)0.28MnO3 (x = 0, 0.25, 0.50, 0.75, 1.0) were synthesized by solid-state reaction method. An initial orthorhombic structure was observed at x = 0, with a subsequent change to rhombohedral structure for x ≥ 0.25. The Curie temperature of the compounds exhibited a marked dependence with the Sr content, with general variations between 190 K (x = 0) and 364 K (x = 1.0), while the saturation magnetization at room temperature showed a small variation between the range 0.30 and 0.38 T. The magnetocaloric effect, measured through heat capacity experiments, showed a maximum entropy variation of −2.56 J/kg · K at x = 0.25, besides a maximum adiabatic temperature variation of 1.13 K. Results are interpreted in terms of the structural transition observed and its effect on the radius of the A-site of the perovskite structure.

Keywords

CeramicFerromagneticMagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1585 - 1589
Copyright
Copyright © Materials Research Society 2009

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