【摘 要】
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The magnetism and magnetocaloric effect (MCE) of rare-earth-based tungstate compounds R3BWO9 (R =Gd,Dy,Ho) have been studied by magnetic susceptibility,isotherm
【机 构】
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Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China;School
论文部分内容阅读
The magnetism and magnetocaloric effect (MCE) of rare-earth-based tungstate compounds R3BWO9 (R =Gd,Dy,Ho) have been studied by magnetic susceptibility,isothermal magnetization,and specific heat measurements.No obvious long-range magnetic ordering can be found down to 2 K.The Curie-Weiss fitting and magnetic susceptibilities under different applied fields reveal the existence of weak short-range antiferromagnetic couplings at low temperature in these systems.The calculations of isothermal magnetization exhibit a giant MCE with the maximum changes of magnetic entropy being 54.80 J/kg·K at 2 K for Gd3BWO9,28.5 J/kg·K at 6 K for Dy3BWO9,and 29.76 J/kg·K at 4 K for Ho3BWO9,respectively,under a field change of 0-7 T.Especially for Gd3BWO9,the maximum value of magnetic entropy change(-△SmaxM) and adiabatic temperature change (-△Tamaxad) are 36.75 J/kg·K and 5.56 K for a low field change of 0-3 T,indicating a promising application for low temperature magnetic refrigeration.
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