Magnetic and magnetocaloric properties of the new R3Co4+xAl12-x (R: Tb → Er) with the Gd3Ru4Al12 structure-type. (November 2017)

• Record Type: Journal Article
• Authors: Pasturel, M.; Nasri, N.; Guizouarn, T.; Belgacem, B.; Ben Hassen, R.; Tougait, O.; Noël, H.
• Is Part Of: Intermetallics. Volume 90(2017)
• Page Start: 74
• Page End: 80
• Publication Date: 2017-11
• Subjects: A. Functional materials -- A. Intermetallics (aluminide) -- B. Magnetic properties -- F. X-ray diffraction; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2017.07.005
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The novel intermetallics R3 Co4+x Al12-x (R = Tb → Er) crystallize in the hexagonal Gd3 Ru4 Al12 structure-type where the rare earth atoms form a heavily distorted kagome network. Single crystal X-ray diffraction reveals an unusual 2b substitution site of Co for Al probably driven by steric effects. The four phases order ferromagnetically below 24.0, 17.4, 11.5 and 5.0 K for R = Tb, Dy, Ho and Er, respectively, linearly decreasing with the de Gennes factor of the rare earth. The magnetocaloric properties have been estimated for R = Ho and Er by measuring the magnetization isotherms at various temperatures. The magnetic entropy changes reach maximum values of −12 and −10 J kg −1 K −1 for a magnetic field change from 5 to 0 T. Highlights: R3 Co4+x Al11-x (R: Tb → Er) crystallizes with the hexagonal Gd3 Ru4 Al12 structure-type. They order ferromagnetically with a Curie temperature following the de Gennes factor of R. The magnetocaloric properties for R = Ho and Er have been determined.