A fitting procedure for magnetic multiphase materials Mossbauer spectra

Citation
Fh. Sanchez et al., A fitting procedure for magnetic multiphase materials Mossbauer spectra, HYPER INTER, 133(1-4), 2001, pp. 33-40
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
HYPERFINE INTERACTIONS
ISSN journal
0304-3843 → ACNP
Volume
133
Issue
1-4
Year of publication
2001
Pages
33 - 40
Database
ISI
SICI code
0304-3843(2001)133:1-4<33:AFPFMM>2.0.ZU;2-8
Abstract
In this work a practical method of fitting complex multiphase Mossbauer eff ect spectra is proposed. The task is simplified imposing specific restricti ons to the analysing functions, which are appropriate for cases where the c omponent phases spectra do not change substantially during the process unde r study. The ME spectra can be analysed using the phases subspectra, by def ining only a reduced number of parameters. The constraints are equivalent t o assume a Doppler velocity transformation v' = (v - delta (m))B-m0/B-m + d elta (m0) for each phase, where delta (m) and B-m are fitting parameters co ntaining information on the phase mean isomer shift and hyperfine field and delta (m0) and B-m0 their reference values. In this manner physically mean ingful results are easy to obtain. The idea was applied to partially nitrog enated R(2)Fe(17)Nx (R = Sm and Y) and partially hydrogen-decomposed Nd-Fe- B materials.