Abstract
Mossbauer spectra of RFe 2 O 4 (R=Y, Ho, Er, Tm or Yb) were measured between 200 and 500 K, in the paramagnetic region. Amalgamation, from two quadrupole doublets due to different ionic states of Fe into one doublet, was observed and successfully analysed by a stochastic theory, except the stoichiometric Y and Er compound. In the latter case, in which Verwey transition takes place at low temperature, the analysis failed because of the existence of other set of absorptions. When the stochastic theory was applicable, seven parameters were deduced at each temperature: isomer shift, quadrupole splitting and width for both states of Fe and the frequency of the fluctuation. It is concluded that Fe atoms fluctuate between two ionic states, neither 2+ nor 3+ in its literal meaning but mixtures of them: itinerant model is more appropriate than the ionic model for 3d electrons of iron in these oxides.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
