Effect of α-Fe impurities on the field dependence of magnetocaloric response in LaFe11.5Si1.5

J. S. Blázquez, L. M. Moreno-Ramírez, J. J. Ipus, L. F. Kiss, D. Kaptás, T. Kemény, V. Franco, A. Conde

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Abstract

Abstract In this work, the theoretical field dependence of the magnetic entropy change far away from the transition is used to analyze the field dependence of composite materials formed by fcc La(Fe,Si)13 and bcc α-Fe(Si) phases. A non-interacting phases approximation is followed in the analysis and results are in good agreement with microstructural data obtained from X-ray diffraction and Mössbauer spectroscopy. The range of validity of the approximation is estimated. It is concluded that the quadratic field dependence of magnetic entropy change is reached a few tens of kelvin above the transition temperature at 1.5 T. However, the linear dependence (characteristic of ferromagnets well below its Curie temperature) is only reached a few hundred kelvin below the transition. The results presented here can be used in the deconvolution of the contribution of impurities to the MCE signal in composites.

Original languageEnglish
Article number34427
Pages (from-to)101-105
Number of pages5
JournalJournal of Alloys and Compounds
Volume646
DOIs
Publication statusPublished - Jun 24 2015

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Keywords

  • Field dependence
  • Magnetocaloric effect
  • Multiphase systems

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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