Abstract
The paper presents studies of microstructure, magnetic and corrosion properties of the Gd58Ge20Si22, Gd56Ge20Si22Co2, Gd56Ge20Si22Ti2 and Gd56Ge20Si22Cr2 (at.%) alloys after isothermal heat treatment at 1450 K for 2 h. The structure investigations of the produced materials performed by X-ray diffraction show the presence of Gd5Ge2Si2-type phase in all investigated samples. DC and AC magnetic measurements confirmed that the Curie temperature depends on the chemical composition of the produced alloys. From M(T) characteristics, it was found that the lowest Curie point (TC = 268 K) was estimated for the Gd58Ge20Si22 sample, whereas the highest value of the Curie temperature (TC = 308 K) was for the Gd56Ge20Si22Cr2 alloys. Moreover, the GdGeSi alloy without alloying additions shows the highest magnetic entropy change |ΔSM| = 15.07 J⋅kg−1⋅K−1 for the maximum magnetic field of 2 T. The maximum |ΔSM| measured for the Gd56Ge20Si22 with the addition of Co, Ti or Cr for the same magnetic field was obtained in the vicinity of the Curie point and equals to 2.92, 2.73 and 2.95 J⋅kg−1⋅K−1, respectively. Electrochemical studies of the produced materials for 60 min and 55 days exposure in 3% NaCl solution show that the highest stability and corrosion resistance were exhibited the sample with added of Ti.
Highlights
Rare earth (RE) based alloys are very attractive materials because of their good magnetic properties [1,2,3,4]
The aim of this paper is to study the effect of Co, Ti and Cr addition on microstructure, DC and AC thermomagnetic properties as well as corrosion stability and resistivity for the Gd58-x Ge20 Si22 Yx (x = 0 or 2; Y = Co, Ti or Cr) alloys after the heat treatment at 1450 K for 2 h
The paper presents the influence of Co, Ti and Cr additions to GdGeSi-based alloy on the Curie temperature change, magnetocaloric effect as well as corrosion stability for the Gd58-x Ge20 Si22 Yx (x = 0 or 2; Y = Co, Ti or Cr) alloys
Summary
Rare earth (RE) based alloys are very attractive materials because of their good magnetic properties [1,2,3,4]. Are widely used in many devices, mostly electrical, due to their distinctive thermomagnetic characteristics When it comes to potential applications in magnetic devices, some of the most interesting materials are Gd-based alloys [12,13,14,15,16,17,18]. These alloys are intensively investigated because they exhibit high magnetocaloric effect (MCE), represented by magnetic entropy changed (|∆SM |), in the vicinity of the Curie point, which is close to the room temperature [18,19,20]. The possibilities of increasing magnetocaloric effect in RE-based materials by proper heat treatment and/or chemical composition changes, together with reducing hysteresis loss [28,29,30,31] and improving application properties, such as corrosion resistance and stability [15,32,33,34] as well as mechanical properties [35,36,37], is one of the most important issues in research on these alloys
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