MICROSTRUCTURAL CHARACTERIZATION OF Nd_(34)Fe_(60)O_6ALLOY

摘要

The microstructure of Nd₃₄Fe₆₀O₆ alloy was characterized by means of scanning electronmicroscope,Auger electron multiprobe,X-ray diffraction,differential thermal analysesand thermomagnetic analyses.It is found that the equilibrium microstructure of the alloy iscomposed of a Nd₂Fe₁₇ matrix,an oxygen-containing Nd-rich phase anda Nd-Fe-O ternary ferromagnetic phase （referred to T₁）.This phase forms via aperitectic reaction between Nd₂Fe₁₇ and Nd-rich phase at 840 ℃.Its composition isaround Nd₃₆Fe₅₄O₁₀,and Curie temperature 180℃.The X-ray diffraction peaks can beindexed on a tetragonal cell with lattice parameter of a=0.771nm and c=2.228nm.Thisstable phase is believed to be transformed from the metastable phase （A₁） in Nd-Febinary system as a result of oxygen introduced.