Structural state and magnetic properties of Nd₂Fe₁₄ B-type rapidly quenched alloys

Abstract

Using X-ray, elastic neutron diffraction (END) and small angular neutron scattering (SANS) methods (Diffractometers D2 and D3 respectively), transmitting electronic microscopy (JEOL JEM-200CX) and magnetometry technique (vibrating sample magnetometer-VSM) the structure and magnetic properties of the rapidly quenched (RQ) alloys of the following compositions: A) Nd 14 Fe 78 B 8 ; B) Y 12 Fe 82 B 6 ; C) Nd 13.3 Co 6.6 Fe 72.6 Ge 0.9 B 6.6 ; D)Nd 9 Fe 85 B 6 ; E) Nd 9 Fe 79 B 12 ; F) Nd 9 Fe 74 Ti 4 C B 12 have been studied. At some quenching conditions or after consequent heat treatments of these alloys the nanoscale state of the main 2-14-1 phase and α-Fe grains can be formed. Their size depends on the sample-preparation conditions and lies in the interval of 10-200 nm. Their influence on magnetic properties of alloys under study is discussed.