Analysis of the Mossbauer Spectra of NdCo5.
Abstract
Permanent magnet production with rare earth-transition element compounds is not a well defined science because microscopic processes in these materials are not understood well. A study was conducted to analyze the Mossbauer spectra of NdCo5 doped with 3% Fe57 to determine the nuclear environment at each nonequivalent crystal lattice site. Absorption spectra were obtained for absorber temperatures of 300, 265, 255, 245, 235, 230 and 77 K, but poor velocity information, faulty, temperature control, and vacuum pump vibrations caused uncertainties in the accuracy of the spectra-especially near zero velocity. Each spectrum was fit to a sum of lorentzian profiles using a least-squares-minimization fitting program. Although the complex spectra were not accurately decomposed into individual site contributions, it was concluded that Fe57 atoms may reside in four nonequivalent sites. Preliminary results also indicated that the two non-Co sites cause the temperature dependent changes in the spectra. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1976
- Accession Number
- ADA027228
Entities
People
- Eugene W. Skluzacek
Organizations
- Air Force Research Laboratory