Magnetic properties and magnetocaloric performances of the rare earth-rich indides RE6Co2.2In0.8 (RE = Gd, Tb, Dy and Ho) with Ho6Co2Ga-type structure.

Magnetic cooling (MC) by utilizing the magnetocaloric effect (MCE) has been considered as one of the most potential promising solid state alternative method to present well-used state-of-the-art gas compression cooling technique. In this work, the rare earth (RE)-rich indides Gd 6 Co 2.2 In 0.8 , Tb 6 Co 2.2 In 0.8 , Dy 6 Co 2.2 In 0.8 and Ho 6 Co 2.2 In 0.8 were fabricated and checked with respect to their crystal structure, magnetic properties and magnetocaloric performances. All the RE 6 Co 2.2 In 0.8 samples are crystallized with the orthorhombic Ho 6 Co 2 Ga-type structure and ordered magnetically. Considerable cryogenic magnetocaloric performances have been found. Around the magnetic transition temperatures of 76, 32, 50 and 18 K for Gd 6 Co 2.2 In 0.8 , Tb 6 Co 2.2 In 0.8 , Dy 6 Co 2.2 In 0.8 and Ho 6 Co 2.2 In 0.8 , the magnetic entropy change (Δ S M) peak values with a magnetic change (Δ H) equals to 0–70 kOe and the corresponding temperature averaged Δ S M (with 3 K-lift) are 11.84 and 11.82 J/kg-K, 8.96 and 8.80 J/kg-K, 9.59 and 9.54 J/kg-K, 20.83 and 20.38 J/kg-K for Gd 6 Co 2.2 In 0.8 , Tb 6 Co 2.2 In 0.8 , Dy 6 Co 2.2 In 0.8 and Ho 6 Co 2.2 In 0.8 , respectively. • The RE 6 Co 2.2 In 0.8 (RE = Gd, Tb, Dy, Ho) compounds are fabricated. • Magnetic properties and MCE in RE 6 Co 2.2 In 0.8 compounds were studied. • Considerable MCE parameters were observed at low temperature. [ABSTRACT FROM AUTHOR]