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用磁性测量和磁取向粉末X射线衍射方法,研究了Gd2Co17-xMx(M=Al,Ga;x≤4)化合物的磁晶各向异性与Al(Ga)原子浓度的依赖关系.随着x的增加, Gd2Co17-xAlx(x≥1)和Gd2Co17-xGax(x≥2)化合物的室温磁晶各向异性由易面转变为易轴;在Al、Ga原子的浓度分别为x=0.9和x=1.8附近时,室温各向异性常数K1由负变正,在x=3时达到最大值,且含Al化合物的K1最大值约为含Ga化合物的四倍根据Al(Ga)原子在Gd2Co17化合物不同Co晶位择优占位的事实,讨论了Co亚点阵磁晶各向异性的演变.结果表明, Al原子择优占据6c晶位是导致Al原子对Co亚点阵各向异性正贡献大于Ga原子的主要原因.
The magnetocaloric anisotropy of Gd2Co17-xMx (M = Al, Ga; x≤4) compounds was determined by the magnetic measurement and magnetic orientation powder X-ray diffraction. , The room-temperature magnetocrystalline anisotropy of Gd2Co17-xAlx (x≥1) and Gd2Co17-xGax (x≥2) compounds changed from easy surface to easy axis. At the concentrations of Al and Ga atoms of x = 0.9 and x = 1.8, the room temperature anisotropy constant K1 is negatively positive and reaches its maximum at x = 3 and the maximum K1 of the Al-containing compound is about four times that of the Ga-containing compound. Depending on the Al (Ga) atom in the Gd2Co17 compound, The results show that the predominance of Al atoms occupies the 6c crystal site and the positive contribution of Al atoms to the sub-lattice anisotropy of Co is larger than that of Ga atoms The main reason.