Magnetocaloric effect and critical behavior in ternary equiatomic magnesium compounds REPtMg (RE = Tb, Dy and Ho). (June 2019)

• Record Type: Journal Article
• Authors: Zhang, Zhenqian; Stein, Sebastian; Li, Lingwei; Pöttgen, Rainer
• Is Part Of: Intermetallics. Volume 109(2019:Jun.)
• Page Start: 24
• Page End: 29
• Publication Date: 2019-06
• Subjects: REPtMg (RE = Tb, Dy and Ho) compounds -- Magnetocaloric effect (MCE) -- Magnetic properties -- Critical behavior -- Magnetic phase transition; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2019.03.003
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The magnetocaloric effect (MCE) and critical behavior in the RE PtMg ( RE = Tb, Dy and Ho) intermetallic compounds around Curie temperatures T C were investigated by magnetization measurements. All the RE PtMg compounds exhibit pronounced MCE performance with the maximum magnetic entropy change ( − Δ S M max ) values up to 5.1, 7.2, 10.2 J/kg K under the magnetic field change ( Δ H ) of 0–5 T around T C of 58, 29, and 20 K for RE = Tb, Dy and Ho, respectively. The reasonable and accurate critical exponents for the present RE PtMg series compounds for RE = Tb, Dy and Ho obtained by the Δ H dependence of Δ S M method are evaluated to be β = 0.4691, 0.4681, 0.4141, γ = 1.0412, 1.0482, 1.1067 and δ = 3.2196, 3.2393, 3.6728 around T C, which are verified by the Widom scaling law and scaling equations, respectively. Highlights: The magnetocaloric property in RE PtMg ( RE = Tb, Dy and Ho) was studied. A considerable reversible MCE was observed for all compounds. The critical behavior in RE PtMg ( RE = Tb, Dy and Ho) were studied. The obtained critical exponents obey the Mean-field model.