Abstract
In this paper the results of specific magnetization and magnetocaloric effect (MCE) measurements for Gd(Co1-xFex)2 system upon the Co substitution by Fe for the x = 0 ÷ 0.60 range are presented. Phase composition was controlled by X-ray diffraction analysis. MCE has been studied within the temperature range of 300-850 K in magnetic fields up to 17 kOe by the magnetic entropy change calculation (ΔSm). It was found that in contrast to the previously studied R(Co-Fe)2 compounds where R = Dy, Ho, Er, an ordinary symmetrical peak of ΔSm(T) in the vicinity of TC is observed for presented samples. Additionally, the MCE comparison of Gd(Co0.88Fe0.12)2 with that for the isostructural Gd(Ni0.88Fe0.12)2 compound having a plateau-like ΔSm temperature dependence is given. The obtained results are discussed.
Highlights
In the last two decades intensive research has been devoted to the search for and development of new magnetocaloric materials for the purpose of their application in energy-efficient and environment-friendly systems of magnetic cooling
magnetocaloric effect (MCE) has been studied within the temperature range of 300-850 K in magnetic fields up to 17 kOe by the magnetic entropy change calculation (∆Sm)
The study of the magnetic properties and the MCE in the R(Me1-xFex)2 (R = Tb, Ho; Me = Al, Ni, Co) quasi-binary systems shown that a partial substitution of Me-element by Fe leads to Curie temperature (TC) increase, and the emergence of significant MCE in a wide temperature range below its TC [2,3,4,5]
Summary
In the last two decades intensive research has been devoted to the search for and development of new magnetocaloric materials for the purpose of their application in energy-efficient and environment-friendly systems of magnetic cooling. The study of the magnetic properties and the MCE in the R(Me1-xFex) (R = Tb, Ho; Me = Al, Ni, Co) quasi-binary systems shown that a partial substitution of Me-element by Fe leads to Curie temperature (TC) increase, and the emergence of significant MCE in a wide temperature range below its TC [2,3,4,5] The latter is an important material property when it is used for the manufacture of magnetic refrigerator working bodies. It allows us to lean in favor of the "weak magnetic sublattice" MCE model [9], giving a qualitative interpretation of the magnetocaloric phenomena in the R(Me-Fe) intermetallic compounds with Laves phases structure These data prompted us to undertake the magnetic and magnetocaloric properties studies of similar to mentioned - Gd(Co1-хFeх) system with Fe content (x) from 0 to 0.60. They are of scientific interest from the point of view of the influence of cobalt replacement by iron on the Curie temperature, the magnitude and MCE peak width and refrigerating capacity (q) of these compounds
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