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There is an apparent mismatch between electron paramagnetic resonance and Mössbauer spectroscopy results on the charge and spin states of dilute Fe impurities in NaCl; Mössbauer spectroscopy data have been interpreted in terms of high-spin Fe 2+, while electron paramagnetic resonance studies suggest low-spin Fe 1+. In the present study, the charge and spin states of dilute substitutional Fe impurities in NaCl and LiF have been investigated with Mn 57→ Fe 57 emission Mössbauer spectroscopy. A scheme is proposed which takes into account the effects of nearest-neighbor distances and electronegativity difference of the host atoms on the Mössbauer isomer shift and allows for the unequivocal differentiation between high-spin Fe 2+ and high/low-spin Fe 1+ in Mössbauer spectroscopy. From these considerations, the Mössbauer results are found to be consistent with dilute Fe impurities in NaCl and LiF in …
American Physical Society
Publication date: 
16 Nov 2022

HP Gunnlaugsson, A Mokhles Gerami, H Masenda, S Olafsson, R Adhikari, K Johnston, K Naicker, G Peters, J Schell, D Zyabkin, K Bharuth-Ram, P Krastev, R Mantovan, D Naidoo, I Unzueta, Isolde Collaboration

Biblio References: 
Volume: 106 Issue: 17 Pages: 174108
Physical Review B