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Magnetocaloric effect in the ferromagnetic GdNi4M (M=Al, Si) and antiferromagnetic NdNiAl4 compounds

Authors :
A. Hoser
T. Toliński
Karol Synoradzki
N. Stüßer
Michał Falkowski
Source :
Journal of Alloys and Compounds. 523:43-48
Publication Year :
2012
Publisher :
Elsevier BV, 2012.

Abstract

Magnetocaloric (MCE) effect has been studied in the ferromagnetic (FM) GdNi 4 Al, GdNi 4 Si, and the antiferromagnetic (AFM) NdNiAl 4 compounds. All the compounds order magnetically between 9 and 30 K. The maximum magnetic entropy change −Δ S M is in the range of 10–16 J kg −1 K −1 for the studied R Ni 4 M compounds. Arrott plots suggest that the phase transition in GdNi 4 Al and GdNi 4 Si may be of a first order-type. It is ascribed to a field-induced AFM–FM transition. Neutron diffraction experiments on NdNiAl 4 show that its magnetic structure is not of a simple AFM-type. Additionally, the specific heat measurements for NdNiAl 4 reveal a change of the sign of MCE and very small values of −Δ S M and the adiabatic temperature change Δ T ad .

Details

ISSN :
09258388
Volume :
523
Database :
OpenAIRE
Journal :
Journal of Alloys and Compounds
Accession number :
edsair.doi...........53db4dfc7636023205153ff515200084