Investigation of the magnetism and magnetocaloric effect in the R2CoAl3 (R = Gd, Tb, Dy, and Ho) compounds

Magnetocaloric materials for hydrogen liquefaction

“…Unfortunately, compounds with other lanthanides possess too low transition temperatures. In a similar manner, R 3 Ni 6 Al 2 compounds 166,167 show mainly ferromagnetic behavior and moderate MCE over a broad range of transition temperatures, from 105 K for Gd to 2.5 K for Er. Lastly, R 2 CoAl 3 compounds, 168 which are MgCu 2 -type Laves phases, show SOPTs and lower transition temperatures than their RCo 2 counterparts, with a significantly weaker MCE.…”

Synthesis, Physical, and Magnetocaloric Properties of MgZn2-Type Gd2Al3Rh

“…Finally, the R(Co 0.25 Al 0.75 ) 2 series (R = Gd−Ho; MgCu 2 type) should be mentioned where also magnetocaloric properties for a broad range of compounds have been investigated. 16 some review articles summarizing the research in intermetallic compounds and alloys should be noted. 17−21 When going from binary Laves phases to ternary ones, a huge structural manifold is observed.…”

“…Also DyAl 2 ( T C = 55.9 K, Δ S M max ≈ −20 J kg –1 K –1 , δ T fwhm = 43 K, RCP ≈ 860 J kg –1 ), HoAl 2 ( T C = 28 K, Δ S M max ≈ −28 J kg –1 K –1 , δ T fwhm = 28 K, RCP ≈ 784 J kg –1 ), and ErAl 2 ( T C = 13.6 K, Δ S M max ≈ −35 J kg –1 K –1 , δ T fwhm = 15 K, RCP ≈ 525 J kg –1 ) show intriguing magnetocaloric properties. Finally, the R (Co 0.25 Al 0.75 ) 2 series (R = Gd–Ho; MgCu 2 type) should be mentioned where also magnetocaloric properties for a broad range of compounds have been investigated . In addition, some review articles summarizing the research in intermetallic compounds and alloys should be noted. − …”

Magnetic and magnetocaloric effect in a stuffed honeycomb polycrystalline antiferromagnet GdInO3

“…[10][11][12][13] In addition, it is important to explore magnetocaloric materials at the cryogenic temperature, which would be beneficial for hydrogen or helium liquefaction and space science. [5,14] Over the past few decades, attention has mostly been paid to cryogenic magnetocaloric materials with rare-earth based alloys and oxides, such as Gd 3 B 5 O 12 (B = Ga, Fe, Al), [15] RM 2 (R = rare earth elements, M = Al, Ni, Co), [16][17][18] RM (M = Zn, Ga), [19][20][21][22] RMX (M = Fe, Co, X = Al, Mg, C), [23,24] R 2 T 2 X (T = Cu, Ni, Co, X = In, Al, Ga, Sn, and so on), [25] R 60 Co 20 Ni 20 (R = Ho and Er), [26] La 1−x Pr x Fe 12 B 6 , [27] Gd 20 Ho 20 Tm 20 Cu 20 Ni 20 , [28] DyNiGa, [2] dual-phase HoNi/HoNi 2 composite, [29] RNO 3 (N = Al, Fe, Mn, Cr, and so on), [30][31][32][33][34][35][36][37] and R 2 M 2 O 7 . [38][39][40][41][42] In particular, recent studies have demonstrated that the Gd 3+ and Eu 2+ ion-based compounds display great MCE performances due to the large angular momentum of the half-filled 4f shell (4f 7 ) and negligible crystal electrical field (CEF) effect with J = S = 7/2, L = 0, with the representative compounds such as GdFeO 3 , [43] GdScO 3 , [44] GdCrO 3 , [45] GdAlO 3 ,…”