Local electronic and charge state of iron in FeTe2

• Autorzy: Stanek J. , Fornal P.
• Konferencja: Proceedings of the All-Polish Seminar on Mössbauer Spectroscopy OSSM'04
• Języki publikacji: EN

Abstrakty

EN

From 57Fe Mössbauer spectrum of FeTe2 taken in high external magnetic field (B = 4.6 T), the sign of electric field gradient was determined as negative, with an asymmetry parameter of 0.2. A comparison of these data with results of calculation of the electric field gradient within point charge model suggests the lattice character of electric field gradient with some contribution from covalency effects. The effective magnetic field acting on 57Fe is less than the applied, which points out the diamagnetic Fe+2 state of iron. This "electronic state" is in a contradiction to Fe+3 "charge state" concluded from 125Te experiments on 3d transition metal ditellurides as well as from 57Fe quadrupole splitting and isomer shift.

Słowa kluczowe

EN

Mössbauer; chemical bonding; charge state; tellurides

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2004
• Tom: Vol. 49,suppl.3
• Strony: 63--65
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Stanek J.

• M. Smoluchowski Institute of Physics, Jagiellonian University, 4 Reymonta Str., 30-059 Kraków, Poland, Tel.: [phone] ext. 5537, Fax: [phone]

autor

Fornal P.

• Institute of Physics, Cracow University of Technology, 1 Podchorążych Str., 30-083 Kraków, Poland

Bibliografia

• 1. Binczycka H, Hafner SS, Moh G, Stanek J (1990) Chemical bonding in MeTe2, Me=Mn,Fe,Co,Ni. Phys Lett 145:467−469
• 2. Cheyne BM, Johnstone JJ, Jones CH (1972) An interpretation of 125Te Mössbauer shifts and quadrupole splittings in some tellurium compounds. Chem Phys Lett 14:545−548
• 3. Qaim SM (1967) Mössbauer effect of 57Fe in various hosts: isomer shifts of the 14.4 keV gamma line of 57Fe in different metallic lattices. Proc Phys Soc 90:1065−1076
• 4. Stanek J, Hafner SS, Fornal P (2001) Metal-tellurium bonds in 3d-transition metal ditellurides. Hyperfine Interact C 5:355−358
• 5. Stanek J, Khasanov AM, Hafner SS (1992) Electronic states of tellurium in 3d-transition-metal ditellurides. Phys Rev B 45:56−60