,
"57Fe, 119Sn and 151Eu Mössbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors"
, in Physica C, Vol. 319, Seite(n) 12 - 20, 7-1999, ISBN: ISSN S0921-4534(99)00291-9, 57Fe, 119Sn and 151Eu Mössbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors, E. Kuzmann, M. Mair, Z. Klencsar, A. Vertes, Z. Homonnay, G. Gritzner, Physica C, 319 (1999) 12 - 20, ISSN S0921-4534(99)00291-9
Original Titel:
57Fe, 119Sn and 151Eu Mössbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors
Sprache des Titels:
Englisch
Original Kurzfassung:
The introduction of the Mössbauer nuclei 57Fe, 119Sn and 151Eu into Tl-based 12(n-1)n superconductors was investigated. The doped Tl-1223 and Tl-1212 superconductors were characterized with respect to critical temperatures, critical currents, phase composition, microstructure, composition of the superconducting and secondary phases and analyzed by Mössbauer spectroscopy. Energy dispersive X-ray (EDX) analysis showed that both 57Fe and 151Eu were incorporated in the superconducting crystallites. Sn was found in secondary phases. Incorporation of Eu into the superconducting phase favored the formation of the Tl-1212 phase. The isomer shift and the electronic field gradient derived from the 151Eu spectra were consistent with Eu3+ at the Ca site. The 57Fe Mössbauer spectra refer to two different micro-environments for the Fe3+. They were assigned to Fe3+ substituting Cu between the two Ca layers and between the Ca and Ba-Sr-O layers.
Sprache der Kurzfassung:
Englisch
Englischer Titel:
57Fe, 119Sn and 151Eu Mössbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors
Englische Kurzfassung:
The introduction of the Mössbauer nuclei 57Fe, 119Sn and 151Eu into Tl-based 12(n-1)n superconductors was investigated. The doped Tl-1223 and Tl-1212 superconductors were characterized with respect to critical temperatures, critical currents, phase composition, microstructure, composition of the superconducting and secondary phases and analyzed by Mössbauer spectroscopy. Energy dispersive X-ray (EDX) analysis showed that both 57Fe and 151Eu were incorporated in the superconducting crystallites. Sn was found in secondary phases. Incorporation of Eu into the superconducting phase favored the formation of the Tl-1212 phase. The isomer shift and the electronic field gradient derived from the 151Eu spectra were consistent with Eu3+ at the Ca site. The 57Fe Mössbauer spectra refer to two different micro-environments for the Fe3+. They were assigned to Fe3+ substituting Cu between the two Ca layers and between the Ca and Ba-Sr-O layers.
Journal:
Physica C
Volume:
319
Seitenreferenz:
12 - 20
Erscheinungsmonat:
7
Erscheinungsjahr:
1999
Notiz zum Zitat:
57Fe, 119Sn and 151Eu Mössbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors, E. Kuzmann, M. Mair, Z. Klencsar, A. Vertes, Z. Homonnay, G. Gritzner, Physica C, 319 (1999) 12 - 20, ISSN S0921-4534(99)00291-9
Forschungs-