Magnetic properties and caloric effect in the Gd(Ni1-x Fex)3 /Cu nanocomposites

Anna Bajorek 1Artur Chrobak 1Grażyna Chełkowska 1Marzena Kwiecień 1Małgorzata Karolus 2Grzegorz Haneczok 2

1. University of Silesia, August Chełkowski Institute of Physics, Department of Solid State Physics, Uniwersytecka 4, Katowice 40-007, Poland
2. University of Silesia, Institute of Material Science, Bankowa 12, Katowice 40-007, Poland

Abstract

During the last decades the Greenhouse effect, caused also by emission of chlorofluorocarbons, is considered to be an increasing problem for our environment. One solution for this problem is to eliminate traditional refrigeration by a modern technique based on the magnetocaloric effect (MCE). Materials used for this application should  exhibit different opposing properties such as a relatively high magnetocaloric effect, a high thermal conductivity and a Curie point near room temperature. It appears that magnetic nancomposites consisting of rare earth and transition metal particles nanodispersed in a conductive matrix will have great potential for the use in refrigeration. Therefore, the aim of the presented work is to study magnetic properties of the Gd(Ni1-x Fex)3 nanopowder embedded into a copper matrix with a caloric effect of high efficiency near room temperature. Apart from that it is important to compare the magnetic properties of the examined nanocomposites and crystalline phase of the magnetic component.

The Gd(Ni1-x Fex)3 compounds were obtained by arc melting technique, the compounds were ground by making use of mechanical ball milling and finally the mixture of milled nanopowder and copper was compacted. As it is shown the best material for the room temperature refrigeration exhibit samples with 0.1<= x <=0.2 for which the Tc is 266 K and 376 K respectively. However the highest magnetocaloric effect was observed for Ni- rich samples.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/15558 must be provided.

 

Related papers
  1. amorphous materials - x-ray studies
  2. Structure studies of Fe-B-X amorphous and nanocrystalline alloys by Rietveld refinement
  3. Structure studies on Ni-Mo electrodeposited alloys with polymers by X-ray diffraction and Auger electron spectroscopy
  4. Influence of metalloids content on magnetic properties and thermal stability of amorphous alloys based on iron
  5. Phase stability and structural relaxation in Fe86-xNbxB14 amorphous alloys
  6. Young modulus and adhesion coefficient of Ni+Mo composite layers on metallic substrate
  7. Structure studies of Fe81Nb5B14 annealed alloys by Rietveld refinement
  8. Application of soft magnetic amorphous alloy Fe80Nb6B14 as electromagnetic shields
  9. Soft magnetic properties of the Fe72Co10Nb6B12 amorphous alloy
  10. Magnetic, electric and electronic structure properties of the Gd(Ni1-xCox)3 compounds
  11. X-ray studies of nanocrystallisation in Fe-Nb-B amorphous alloys

Presentation: Poster at E-MRS Fall Meeting 2008, Symposium F, by Anna Bajorek
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-09 12:40
Revised:   2009-06-07 00:48
Google
 
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine