Abstract
Amorphous ribbons with the formal composition (T 1) 1− x (T 2) x (i.e. Nd 12±ϵFe 88− yB y ) with T 1 = Nd 2Fe 14B and T 2 = Nd 1.1.Fe 4B 4 and 0≤ x≤1.0 were prepared by a single roller quenching apparatus. The Curie temperature T c and crystalliz ation temperature T cr of the samples and the effects of heat treatment on their magnetic properties and microstructure were studied. The concentration dependence of T c is found to have a maximum value of 505 K and about x = 0.19 ( y = 13). The T cr increases rapidly with increasing x, goes through a maximum to lower values, then rises again. The X-ray diffraction measurements show that the crystallized samples consist of T 1 and T 2. In the electron diffraction microscope we see well defined grains of T 1 and T 2 which have an average size of about 650 Å for T 1 and about 1500 Å for T 2 after annealing at 700–800°C. The coercivity under optimal annealing condition is found to be approximately constant with increasing concentration x of the nonmagnetic T 2 phase. An intrinsic coercivity of 8.6 kOe and an energy product of 12 MGOc in Nd 2Fe 14B are obtained at room temperature by annealing at 800°C for 10 min.
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