Premium
High resolution transmission electron microscopy of Sm‐Co based permanent magnets
Author(s) -
Hiraga K.,
Hirabayashi M.,
Ishigaki N.
Publication year - 1986
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1986.tb02757.x
Subject(s) - coercivity , materials science , magnet , transmission electron microscopy , microstructure , high resolution transmission electron microscopy , crystallography , lattice (music) , condensed matter physics , hexagonal crystal system , composite material , chemistry , nanotechnology , physics , quantum mechanics , acoustics
SUMMARY Interface microstructures between rhombohedral Sm 2 Co 17 and hexagonal SmCo 5 phases in a sintered permanent magnet of Sm(Co 0.675 Fe 0.175Ni 0.05 Cu 0.1 ) 7 have been investigated by edge‐on observations with the many‐beam imaging technique. In the specimen annealed at 800°C for 4 h which shows a maximum magnetic coercivity, the interface boundaries were coherent accompanying the lattice distortion; the habit planes were parallel to the {101} 2:17 and {111} 1:5 planes with the orientation relationship of (0001) 2:17 //(0001) 1:5 and [1010] 2:17 //[1120] 1:5 . In the specimen annealed for 150 h which shows a lower coercivity, the interface boundaries were characterized with regular alignments of interfacial edge dislocations. The observed interface structures were discussed in connection with the change in magnetic properties.