Magnetic and magnetocaloric properties of itinerant-electron system Hf.sub.1-x./sub.Ta.sub.x./sub.Fe.sub.2./sub. (x = 0.125 and 0.175)

0452819 - FZÚ 2016 RIV NL eng J - Journal Article
Diop, L.V.B. - Kaštil, Jiří - Isnard, O. - Arnold, Zdeněk - Kamarád, Jiří
Magnetic and magnetocaloric properties of itinerant-electron system Hf_1-xTa_xFe₂ (x = 0.125 and 0.175).
Journal of Alloys and Compounds. Roč. 627, Apr (2015), s. 446-450. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA ČR GAP204/12/0692
Institutional support: RVO:68378271
Keywords : itinerant-electron compounds * magnetic properties * magnetocaloric effect
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.014, year: 2015

Intrinsic magnetic properties and magnetocaloric effect (MCE) have been investigated for Hf1-xTaxFe2 (x = 0.125 and 0.175) itinerant-electron compounds which exhibit a temperature-induced transition from the ferromagnetic (FM) to the antiferromagnetic (AFM) state. Upon increasing Ta concentration, the ferromagnetic ordering temperature strongly decreases with decreasing the lattice parameters and both the isothermal magnetic entropy change DSM and the adiabatic temperature change DTad are enhanced. An adiabatic temperature change of DTad = 2 and 2.5 K was observed in Hf0.875Ta0.125Fe2 and Hf0.825Ta0.175Fe2, respectively, for a magnetic field change of 3 T. Therefore, the partial substitution of Ta for Hf is highly effective in the enhancement of the magnetocaloric effect in Hf1-xTaxFe2 systems. In addition substitution can be used to tune both the transition temperature but also the magnetic transition from first toward second order type.
Permanent Link: http://hdl.handle.net/11104/0253731