Title :
Neutron diffraction and extended X-ray absorption fine structure studies of Pr3(Fe1-xCox)27.5Ti1.5 permanent magnet compounds
Author :
Harris, V.G. ; Huang, Q. ; Shah, V.R. ; Markandeyulu, G. ; Rama Rao, K.V.S. ; Huang, M.Q. ; Sirisha, K. ; McHenry, M.E.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
9/1/1999 12:00:00 AM
Abstract :
Neutron diffraction (ND) and extended X-ray absorption fine structure (EXAFS) measurements were carried out to determine the long-range and short-range structural properties of Co-substituted Pr 3Fe1-xCoxTi1.5 compounds. ND refinement analysis indicates Ti atoms occupy the 4g and 4i Fe sites and Co atoms occupy, without preference, those Fe sites not shared with the Ti atoms. EXAFS measurements show the local environment of the Pr experiences increasing static disorder with the introduction of Co, and its coordination sphere contracts in the vicinity of those Co near neighbors. The Fe local environment remains unaffected with the introduction of Co suggesting that substitution in excess of 40% can be achieved in this structure
Keywords :
EXAFS; cobalt alloys; crystal structure; ferromagnetic materials; iron alloys; long-range order; neutron diffraction; permanent magnets; praseodymium alloys; short-range order; titanium alloys; 4g Fe sites; 4i Fe sites; Co content dependence; Co site occupation; EXAFS; Fe local environment; Pr coordination sphere; Pr local environment; Pr3(Fe1-xCox)27.5Ti 1.5; Pr3(FeCo)27.5Ti1.5; Ti site occupation; extended X-ray absorption fine structure; long-range structural properties; neutron diffraction; permanent magnets; short-range structural properties; static disorder; Atomic measurements; Electromagnetic wave absorption; Iron; Laboratories; NIST; Neodymium; Neutrons; Permanent magnets; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
