Mössbauer-Effect Study of Calciomagnetites

• Authors: S. Dubiel , J. Cieślak , J. Orewczyk , S. Jasieńska
• 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

76.80.+y; 82.80.Ej

Discipline

• 82.80.Ej: X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods
• 76.80.+y: Mössbauer effect; other γ-ray spectroscopy(see also 33.45.+x Mössbauer spectra—in atomic and molecular physics; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1998
• Volume: 93
• Issue: 3
• Pages: 547-561

Dates

published

1998-03

received

1997-09-23

(unknown)

1998-01-28

Contributors

author

S. Dubiel

• Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland,

author

J. Cieślak

• Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland,

author

J. Orewczyk

• Faculty of Metallurgy and Material Engineering, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland

author

S. Jasieńska

• Faculty of Metallurgy and Material Engineering, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland

Identifiers

DOI

10.12693/APhysPolA.93.547