EPR of trivalent iron centers in a BaF2: Fe crystal

Autor:	V. A. Ulanov, M. M. Zaripov, E. P. Zheglov, E. R. Zhiteĭtsev
Rok vydání:	2006
Předmět:	Materials science Magnetic moment Condensed Matter Physics Spectral line Electronic Optical and Magnetic Materials Ion law.invention Crystal Crystallography Paramagnetism Nuclear magnetic resonance law Orthorhombic crystal system Spin (physics) Electron paramagnetic resonance
Zdroj:	Physics of the Solid State. 48:1887-1892
ISSN:	1090-6460 1063-7834
DOI:	10.1134/s1063783406100118
Popis:	An orthorhombic paramagnetic Fe3+ ion center (concentration of iron ions is 0.1 at. %) was found using EPR in BaF2: Fe crystals irradiated by x rays. The EPR spectra recorded in the Q range at a temperature T = 77 K exhibit both the fine structure typical of a center with effective spin S = 5/2 and a superhyperfine structure (SHFS) indicating the SHFS interaction of the electronic moment of the center with the nuclear magnetic moments of its six ligands (F− ions). An analysis of the SHFS reveals that this center forms through the replacement of a Ba2+ cation by a Fe2+ cation, which transforms into a Fe3+ (6A1g) cation under x-ray irradiation and shifts into a neutral position along the C2 axis of the cubic coordination shell of the replaced host cation.
Databáze:	OpenAIRE
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