Title :
NMR of Nd and Sm in Nd2Fe14B and Sm2 Fe14B
Author :
Kapusta, Cz. ; Figiel, H. ; Stoch, G. ; Lord, J.S. ; Riedi, P.C.
Author_Institution :
Dept. of Solid State Phys., Univ. of Min. & Metall., Mickiewicza, Poland
fDate :
11/1/1993 12:00:00 AM
Abstract :
The spin-echo nuclear magnetic resonance (NMR) spectra of 143 Nd, 145Nd, 147Sm and 149Sm in polycrystalline samples of Nd2Fe14B and Sm2 Fe14B measured at 4.2 K are presented. Well resolved quadrupole subspectra are assigned to the rare earth sites 4f and 4g in the compounds. The corresponding values of the quadrupole splitting and hyperfine fields are analyzed in terms of the contributions, depending on the rare earth type, as well as local symmetry and environment of the sites. From the quadrupole splitting, the 4f and the lattice contributions to the electric field gradient at Nd and Sm nuclei are derived. On this basis, the crystal electric field coefficients A2 0 for both rare earth sites are obtained and compared to those obtained in other measurements
Keywords :
boron alloys; crystal field interactions; crystal hyperfine field interactions; ferromagnetic properties of substances; iron alloys; neodymium alloys; permanent magnets; samarium alloys; spin echo (NMR); 4.2 K; 143Nd; 145Nd; 147Sm; 149Sm; NMR; Nd2Fe14B; Sm2Fe14B; crystal electric field coefficients; electric field gradient; hyperfine fields; lattice contributions; local symmetry; polycrystalline samples; quadrupole splitting; quadrupole subspectra; rare earth sites; spin-echo nuclear magnetic resonance; Crystallization; Electrons; Extraterrestrial measurements; Iron; Lattices; Magnetic field measurement; Neodymium; Nuclear magnetic resonance; Physics; Samarium;
Journal_Title :
Magnetics, IEEE Transactions on
