Influence of doping elements (Y, Fe, V) on magnetic properties of RM2 (R = Gd, Er; M = Fe, Co, Ni) Laves phases and their hydrides

• Published in: Journal of physics. Conference series Vol. 289; no. 1; p. 012018
• Main Authors: Michor, H, Kotur, B, Myakush, O, Hilscher, G
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.04.2011
• Subjects: Amorphization; Cobalt; Dilution; Doping; Erbium; Gadolinium; Hydrides; Iron; Laves phase; Magnetic moments; Magnetic properties; Nickel; Physics; Rare earth elements; Room temperature; Substitutes; Yttrium
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/289/1/012018

The ternary R0.85Y0.15Ni2, RNi1.85Fe0.15 (R Gd and Er), ErM1.85V0.15 (M=Fe, Co) and Er(Fe,Co)1.85V0.15 phases have been investigated for the influence of doping elements (Y, Fe, V) on magnetic properties of RM2 (R Gd, Er; M Fe, Co, Ni) Laves phases and their hydrides. All investigated compounds can easily absorb hydrogen up to 3.3–3.9 at.H/f.u. at 0.1-0.12 MPa pressure without amorphization. The hydrides preserve the structure of the parent compounds. Rare earth substitution of Gd and Er by 5 at. % Y in RNi2 based compounds reduces slightly both the ordering temperature and the magnetic moment due to the dilution effect of a magnetic rare earth element by a nonmagnetic one. The corresponding 3d metal substitution of Ni by 5 at. % Fe increases TC by a factor of 3–7 for Gd and Er, respectively. Er(Fe,Co,V)2 compounds with a Fe content higher than 20 at. % exhibit ordering temperatures above room temperature. Hydrogen absorption reduces the saturation moment and suppresses long range magnetic order in majority of investigated alloys to the temperature below 2 K except for ErFe1.85V0.15H3.9 and ErFe0.925Co0.925V0.15H3.6.