利用浮区法制备了磁致伸缩材料Ｔｅｒｆｅｎｏｌ－ｄ，通过磁致伸缩系数的测定，发现利用浮区法制备的样品在一定的压应力下有“跳跃效应”。通过Ｘ射线衍射、劳埃背反射发现，样品是轴向沿１１０取向的孪生单晶。通过模型计算，认为沿１１０取向的晶体，在一定的压应力下也可产生较大的压力效应 The magnetostrictive material Terfenol-d was prepared by the float zone method. The magnetostrictive coefficient was measured and it was found that the sample prepared by the floating zone method had a “jumping effect” under a certain compressive stress. By X-ray diffraction, Lyle’s back reflection found that the sample was a twin single crystal oriented axially along 110. Through the model calculation, it is considered that the crystal orientated along 110 can also exert a greater pressure effect under a certain compressive stress