Magnetocaloric effect in Ho2In over a wide temperature range

Abstract

Articles you may be interested inLarge magnetocaloric effect with a wide working temperature span in the R2CoGa3 (R=Gd, Dy, and Ho) compounds Large magnetocaloric effects over a wide temperature range in MnCo1−xZnxGe Magnetocaloric effect of Ho-, Dy-, and Er-based bulk metallic glasses in helium and hydrogen liquefaction temperature range Appl.The compound Ho 2 In exhibits two successive magnetic phase transitions: a spin-reorientation transition at T SR = 32 K and a magnetic-ordering transition at T C = 85 K. The maximum reversible −⌬S M values are 6.3 and 11.2 J/kg K at T SR and T C , respectively, for a field change of 5 T. These two −⌬S M peaks with the same sign are partly overlapping, which results in a wide temperature interval with appreciable magnetocaloric effect. The results on Ho 2 In indicate that materials with successive SR and magnetic-ordering transitions may constitute an important new class of magnetic refrigerants since they work in a wider temperature range than the conventional refrigerant materials.

Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules

“…It is worthwhile noting that the signs of two entropy changes in most of these materials are opposite (Chattopadhyay et al 2006;Kumar et al 2008), which may not fully enlarge the working temperature range since the zero MCE may be not avoided in the transition temperature range between the conventional and inverse MCE. The exception is Ho 2 In compound that exhibits two successive magnetic phase transitions, in which two -DS M peaks with the same sign are partly overlapping, resulting in a wide temperature interval with appreciable MCE (Zhang et al 2009). However, MCE from SPM and SPM-AFM transition with the same sign of -DS m in the Dy nanocapules can also enlarge the working-temperature range effectively.…”

“…The wide working-temperature range mainly comes from the coexistence of the SPM and the SPM-AFM transition in Dy nanocapsules. For traditional magnetic refrigeration material, the wide working-temperature range always appears in bulk materials with two successive AF-FM and FM-PM magnetic transitions, like in Ce(Fe, Ru) 2 , Tb 2 Ni 2 Sn, or successively structural and magnetic transitions in Ni-Mn-In-based Hesular alloys (Chattopadhyay et al 2006;Kumar et al 2008;Zhang et al 2009). It is worthwhile noting that the signs of two entropy changes in most of these materials are opposite (Chattopadhyay et al 2006;Kumar et al 2008), which may not fully enlarge the working temperature range since the zero MCE may be not avoided in the transition temperature range between the conventional and inverse MCE.…”

The study of the magnetic and room-temperature magnetocaloric properties in spin-reorientation Nd1−xDyxCo4Al (x=0, 0.1) alloys

“…It is well known that the spin-reorientation (SR) transition manifests itself by a rotation of the easy magnetization direction and is often accompanied by an abrupt change of the magnetization [9][10][11]. Therefore, MCE resulted from materials possessing the SR transition could be expected [12][13][14][15]. Until now, the MCE in SR materials is mostly obtained at relatively low temperature [12][13][14][15].…”

Reversible magnetocaloric effect and refrigeration capacity enhanced by two successive magnetic transitions in DyB2

“…In addition, the refrigeration capacity (RC), which is a measure of the amount of heat that can be transferred between cold and hot sinks in one ideal refrigerant cycle, is an important criterion for magnetic refrigeration. When two transitions are close to each other, the working window temperatures may overlap, which may result in an improved RC [13]. In the present work, we investigated the magnetic properties and MCE of the binary intermetallic DyB 2 .…”