Gd1-xVx系列合金的磁热效应研究

Study on Magnetocaloric Effects of Gd1-xVx Alloys

摘要:

采用真空电弧熔炼方法制备Gd1-xVx (x=0.01，0.03，0.05，0.07，0.09)系列合金。研究发现：Gd1-xVx合金完全保持了纯Gd的六方型晶体结构，其在居里温度附近的磁特性符合二级相变规律；合金居里温度比纯Gd低1~2 K，并且随x的增加变化很小；在低磁场下Gd1-xVx合金具有较大的磁熵变、绝热温变以及较宽的ΔSM-T 曲线峰，并且所有样品的相对制冷能力都明显优于纯Gd。

Abstract:

The magnetic behavior of Gd1-xVx alloys (x=0.01, 0.03, 0.05, 0.07, 0.09) prepared by vacuum arc melting was analyzed. X-ray diffraction patterns show that all Gd1-xVx alloys retain crystal hexagonal structure of pure Gd. The ferromagnetic to paramagnetic phase transition of all alloys is the second order type. The Curie temperatures of these alloys are lower than that of Gd by 1~2 K and change a little with x increasing. It is noted that these alloys have large values of magnetic entropy change ΔSM, adiabatic temperatures change ΔTad and broader peak in the ΔSM-T plot in the low magnetic fields. All the alloys have remarkably better relative cooling power than pure Gd.