Preliminary 57Fe Mössbauer study of metamict gadolinite REE2Fe2+Be2Si2O10 annealed at 1373 K in argon
Year: 2025
Type: article
Abstract: Metamict minerals contain uranium and thorium, the decay of which results in the degradation of their crystal structures. This paper reports the preliminary study of 57 Fe Mössbauer spectroscopy and X-ray diffraction analysis of metamict gadolinite REE 2 Fe 2+ Be 2 Si 2 O 10 after isothermal annealing at 1373 K in argon. The Mössbauer spectra for samples annealed for 0.5, 3, 8, 15, and 60 min can be fitted to one Fe 2+ quadrupole doublet with a strong asymmetry of the Fe 2+ absorption peaks. Despite the almost instantaneous recrystallization at 1373 K, slight but noticeable changes in the amplitude and line width ratios of the absorption peaks and quadrupole splitting caused by extending the annealing time are observed. These changes in hyperfine parameters as a function of annealing time can be used to determine the activation energy of the isothermal recrystallization process.
Source: Interactions
Author: Dariusz Malczewski
Institution: University of Silesia in Katowice
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,890
Funder: Narodowe Centrum Nauki
Award: G455589436
OpenAlex ID: W7117362822