Enhanced magnetostrictive properties of lightly Pr-doped Fe_(83)Ga_(17) alloys |
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| Affiliation: | 1. Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, School of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022, China;2. School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;3. Baotou Research Institute of Rare Earths, Baotou 014030, China;4. Department of Electrical and Computer Engineering, CM3IC, Northeastern University, Boston, MA 02115, USA |
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| Abstract: | Fe_(83)Ga_(17)Pr_x alloys,where x=0,0.2,0.4,0.6 and 1.0,were prepared by a non-consumable vacuum arc melting technique under an inert argon gas atmosphere.The crystal structure and surface morphologies of the alloys were studied by X-ray diffraction(XRD) and scanning electron microscopy(SEM),respectively.Local compositional variations were measured by energy dispersive X-ray spectroscopy(EDXS).The magnetostriction coefficients of the alloys were measured by means of a differential resistive strain sensor.The magnetism of the sample was measured by a vibrating sample magnetometer(VSM).The results show that the parent Fe_(83)Ga_(17) alloy consists of a single A2 phase of bcc symmetry,whereas the Pr doped Fe_(83)Ga_(17) alloys are composed of the A2 phase of bcc structure and a small volume fraction of PrGa2 as a secondary phase.Most importantly,with increasing x,the magnetostriction coefficient of the Fe_(83)Ga_(17)Pr_x alloys first increases reaching a maximum saturation magnetostriction coefficient of192 ppm for x=0.6 at a magnetic field strength of 486 kA/m,then decreased.This maximum represents a 400% increase over the parent alloy with a mere 0.6 at% Pr doping. |
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| Keywords: | Fe–Ga alloy Magnetostriction Praseodymium Rare earth element doping |
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