Magnetocaloric effects in RTX intermetallic compounds ( R = Gd–Tm, T = Fe–Cu and Pd, X = Al and Si)

Abstract

The magnetocaloric effect (MCE) of RT Si and RT Al systems with R = Gd-Tm, T = Fe-Cu and Pd, which have been widely investigated in recent years, is reviewed. It is found that these RT X compounds exhibit various crystal structures and magnetic properties, which then result in different MCE. Large MCE has been observed not only in the typical ferromagnetic materials but also in the antiferromagnetic materials. The magnetic properties have been studied in detail to discuss the physical mechanism of large MCE in RT X compounds. Particularly, some RT X compounds such as ErFeSi, HoCuSi, HoCuAl exhibit large reversible MCE under low magnetic field change, which suggests that these compounds could be promising materials for magnetic refrigeration in a low temperature range.

Large magnetocaloric effect of NdGa compound due to successive magnetic transitions

“…Lots of MCE materials with large value of ∆S M have been obtained and studied in room temperature range. [6][7][8][9][10][11][12][13] In recent years, lots of attention have also been paid on the magnetic materials with low transition temperatures, for this kind of MCE materials can be used for liquefaction, 14,15 such as TmZn, 16 RNi (R=Ho, Er), 17,18 R 12 Co 7 (R=Ho, Er) [19][20][21][22][23] and HoCoSi. 24 Especially the magnetic compounds with successive transitions show advantage on δT FWHM and RC and thus researchers are inclined to explore MCE materials in those with several magnetic transitions.…”

DENSITY FUNCTIONAL CALCULATIONS ON SPECTRUM AND ELECTRONIC PROPERTIES OFWNCO(N= 1 ~ 6) CLUSTERS

“…Finally, the configuration with the lowest energy is taken as the ground-state structure. The ground-state structures of W n (n = 2 ∼ 6) and W n CO (n = 1 ∼ 6) clusters 23 are shown in Fig. 1.…”

“…Recently, the structural, adsorption and electronic properties of one single CO molecule adsorbed on W n (n = 1 ∼ 6) clusters have been studied by our group. 23 As an extension work, we perform a comprehensive study on the IR vibration spectrum, static polarizability and thermodynamical property of the W n CO (n = 1 ∼ 6) clusters, which could furnish a better understanding in the interaction between CO molecule and tungsten atoms, and could find new functional materials.…”

Complex magnetic properties and large magnetocaloric effects in RCoGe (R=Tb, Dy) compounds

“…[12][13][14][15][16] The RTX (R = rare earth, T = transition metal, and X = p-block metal) family compounds with various crystalline structures have been explored extensively because of their rich magnetic and electrical transport properties. [17][18][19] Recently, lots of attentions have been paid to…”