Title :
Structure and magnetic properties of hot pressed Dy3-x RxAl2 system (R=Gd and Tb)
Author :
Obermyer, R.T. ; Merches, M. ; Miller, K. ; Sankar, S.G.
Author_Institution :
Dept. of Phys., Pennsylvania State Univ., McKeesport, PA, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
Dy3-xRxAl2 (R=Gd and Tb) alloys were hot pressed in an inert atmosphere using induction heating in the temperature range 950 to 1000°C and pressures up to 1500 psig. In all cases, with the exception of the spin-only Gd3Al2, preferential magnetic alignment was observed. This was confirmed by X-ray, optical micrography, and magnetic measurements on samples both parallel and perpendicular to the press direction. The Curie temperature of these alloys showed a linear increase of ~58 K/Gd atom and ~32 K/Tb atom substitution. The intrinsic coercivity showed a strong decrease with increased gadolinium content. Reasonably good energy products ~36 MGOe and good coercivities ~9.5 kOe were obtained for Dy2.25Gd0.75Al2 and Dy1.5Tb1.5Al2 alloys at 10 K
Keywords :
Curie temperature; aluminium alloys; coercive force; dysprosium alloys; ferromagnetic properties of substances; gadolinium alloys; hot pressing; magnetisation; terbium alloys; 10 K; 950 to 1000 degC; Curie temperature; Dy3-xGdxAl2; Dy3-xTbxAl2; X-ray measurements; energy products; hot pressing; induction heating; inert atmosphere; intrinsic coercivity; magnetic measurements; optical micrography; preferential magnetic alignment; Coercive force; Magnetic analysis; Magnetic anisotropy; Magnetic materials; Magnetic properties; Microstructure; Permanent magnets; Perpendicular magnetic anisotropy; Pressing; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
