Magnetocaloric effect in textured rare earth intermetallic compound ErNiстатья
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Дата последнего поиска статьи во внешних источниках: 25 июля 2019 г.
Аннотация:Melt-spun ErNi crystallizes in orthorhombic FeB-type structure (Space group Pnma, no. 62) similar to the arc-melted ErNi compound. Room temperature X-ray diffraction (XRD) experiments reveal the presence of texture and preferred crystal orientation in the melt-spun ErNi. The XRD data obtained from the free surface of the melt-spun ErNi show large intensity enhancement for (1 0 2) Bragg reflection. The scanning electron microscopy image of the free surface depicts a granular microstructure with grains of 1 mcm size. The arc-melted and the melt-spun ErNi compounds order ferromagnetically at 11 K and 10 K (TC) respectively. Field dependent magnetization (M-H) at 2 K shows saturation behaviour and the saturation magnetization value is 7.2 mB/f.u. for the arc-melted ErNi and 7.4 mB/f.u. for the melt-spun ErNi. The isothermal magnetic entropy change (dSm) close to TC has been calculated from the M-H data. The maximum isothermal magnetic entropy change, dSm max, is -27 J/kgK and -24 Jkg-1K-1 for the arc-melted and melt-spun ErNi for 50 kOe field change, near TC. The corresponding relative cooling power values are -440 J/kg and -432 J/kg respectively. Although a part of dSm is lost to crystalline electric field (CEF) effects, the magnetocaloric effect is substantially large at 10 K, thus rendering melt-spun ErNi to be useful in low temperature magnetic refrigeration applications such as helium gas liquefaction.