4.7 Article

Room temperature magnetic and magnetocaloric properties of La0.67Ba0.33Mn0.98Ti0.02O3 perovskite

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 508, 期 2, 页码 292-296

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.08.145

关键词

Chemical synthesis; Microstructure; Magnetic materials; Magnetocaloric effect

资金

  1. Tunisia-France exchange program DGRS-CNRS [09//R 11-52]

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The influence of Ti-doping on the magnetic and magnetocaloric properties of La0.67Ba0.33Mn0.98Ti0.02O3 perovskite is investigated. La0.67Ba0.33Mn0.98Ti0.02O3 sample was prepared by ceramic route at 1400 degrees C. It is a cubic Pm-3m single phase and exhibits a sharp ferromagnetic-paramagnetic (FM-PM) transition at a Curie temperature T-C (314 K) which is very close to room temperature. Above T-C the data follow a Curie-Weiss law with a shift between experimental and calculated effective paramagnetic moment. The associated experimental magnetic entropy change (Delta S-M and the relative cooling power (RCP) have been determined. The observed field dependence of Delta S-M is explained reasonably well by the Landau theory of second order phase transition. The maximum entropy change vertical bar Delta S-M(max)vertical bar exhibits a linear dependence with the applied magnetic field. vertical bar Delta S-M(max)vertical bar and RCP are respectively 3.21J kg(-1) K-1 (21.48 mJcm(-3) K-1) and 307J kg(-1) (2054 rnJ cm-3) at 5T, which are about 30% of pure Gd. Our results on the magnetocaloric effect (MCE) are compared favourably with reported values for other doped manganites, thus concluding that our sample can be used as a magnetic refrigerant around room temperature. (c) 2010 Elsevier B.V. All rights reserved.

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