PL EN


Preferences help
enabled [disable] Abstract
Number of results
1998 | 93 | 3 | 547-561
Article title

Mössbauer-Effect Study of Calciomagnetites

Content
Title variants
Languages of publication
EN
Abstracts
EN
Ca_{x}Fe_{3-x}O_{4} samples, with x ≤ 0.28 , prepared from α-Fe_{2}O_{3} and CaO by the Bridgman method were investigated by means of ^{57}Fe Mössbauer spectroscopy. Room temperature spectra gave evidence that the samples were multiphase, the calciomagnetite being the dominant phase with a contribution of 73% to 99%, depending on the sample. Analysis of the subspectra associated with the calciomagnetite gave evidence that Ca-ions reside on the tetrahedral (A) sites and have not random distribution. Their presence on those sites causes a reduction of the hyperfine field at Fe nuclei occupying the octahedral positions (B) by 12.3(1.0) kOe per one Ca-ion and a decrease in the average hf field, 〈H_{B}〉/dx, at the rate of 29 kOe/mol% for x ≤ 0.07 and of 387 kOe/mol% for larger x. In addition, a linear correlation between 〈H_{B}〉 and the average isomer shift, 〈I_{B}〉, was revealed to hold. It indicates that addition of Ca-ions into the magnetite causes a decrease in the spin-density and an increase in the charge-density at Fe nuclei occupying the B-sites.
Keywords
EN
Contributors
author
  • Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland,
author
  • Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland,
author
  • Faculty of Metallurgy and Material Engineering, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland
author
  • Faculty of Metallurgy and Material Engineering, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv93z314kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.