首页|Large magnetostriction of Nd0.2Tb0.3Dy0.5Fe1.93/epoxy composites in a wide temperature range
Large magnetostriction of Nd0.2Tb0.3Dy0.5Fe1.93/epoxy composites in a wide temperature range
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We report the magnetostrictive performance of the Nd0.2Tb0.3Dy0.5Fe1.93/epoxy composites.Measure-ment of Mössbauer spectra and the XRD results indicate that the easy magnetic direction of the Nd0.2Tb0.3Dy0.5Fe1.93 compound is along<111>direction with spontaneous magnetostriction λ111 of 1900 ppm.The<111>-oriented Nd0.2Tb0.3Dy0.5Fe1.93/epoxy composites with particle volume fractions of 20 vol％-55 vol％were prepared.Magnetization measurements demonstrate that the composite is highly anisotropic.The raw material cost of Nd0.2Tb0.3Dy0.5Fe1.93 is about 85％of that of the Terfenol-D(Tb0.3Dy0.7Fe2)composition.Nd0.2Tb0.3Dy0.5Fe1.93/epoxy composites possess comparable magnetostric-tion with those composites made of Tb0.3Dy0.7Fe2 particles.At room temperature,the magnetostriction λⅡof the Nd0.2Tb0.3Dy0.5Fe1.93/epoxy composite reaches 420 ppm at a low field of 80 kA/m and about 1000 ppm at 239 kA/m.In addition,the composite exhibits a large saturation magnetostriction λⅡ over 1200 ppm from 300 to 100 K,suggesting its potential applications as a low-cost magnetostrictive ma-terial in a wide temperature range.Therefore,the current study offers an opportunity to widen the operating temperature range of the magnetostrictive composite.
Magnetostrictive compositeNd0.2Tb03Dy0.5Fe1.93Wide temperature rangeLaves phaseRare earths
Hehe Ding、Yangguang Shi、Shaolong Tang
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MIIT Key Laboratory of Aerospace Information Materials and Physics,Department of Applied Physics,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China
National Laboratory of Solid State Microstructures,Nanjing University,Nanjing,210093,China
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