57Fe, 119Sn and 151Eu Moessbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors

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Abstract

The introduction of the Moessbauer nuclei 57Fe, 119Sn and 151Eu into Tl-based 12(n-1)n superconductors was investigated. The doped Tl-based superconductors were characterized with respect to critical temperatures, critical currents, microstructure and composition of the superconducting and secondary phases. The samples were then analyzed by Moessbauer 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 electric field gradient derived from the 151Eu spectra were consistent with Eu3+ at the Ca site. The 57Fe Moessbauer 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.

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume319
Issue number1
DOIs
Publication statusPublished - Jun 1 1999

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Superconducting materials
Energy dispersive X ray analysis
Critical currents
Crystallites
Isomers
crystallites
critical current
critical temperature
isomers
Electric fields
Spectroscopy
gradients
microstructure
Microstructure
nuclei
electric fields
shift
Chemical analysis
spectroscopy
x rays

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "57Fe, 119Sn and 151Eu Moessbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors",
abstract = "The introduction of the Moessbauer nuclei 57Fe, 119Sn and 151Eu into Tl-based 12(n-1)n superconductors was investigated. The doped Tl-based superconductors were characterized with respect to critical temperatures, critical currents, microstructure and composition of the superconducting and secondary phases. The samples were then analyzed by Moessbauer 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 electric field gradient derived from the 151Eu spectra were consistent with Eu3+ at the Ca site. The 57Fe Moessbauer 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.",
author = "E. Kuzmann and M. Mair and Z. Klencs{\'a}r and A. V{\'e}rtes and Z. Homonnay and G. Gritzner",
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T1 - 57Fe, 119Sn and 151Eu Moessbauer studies of (Tl,Pb)(Ba0.2Sr0.8)2Ca2Cu3Oy superconductors

AU - Kuzmann, E.

AU - Mair, M.

AU - Klencsár, Z.

AU - Vértes, A.

AU - Homonnay, Z.

AU - Gritzner, G.

PY - 1999/6/1

Y1 - 1999/6/1

N2 - The introduction of the Moessbauer nuclei 57Fe, 119Sn and 151Eu into Tl-based 12(n-1)n superconductors was investigated. The doped Tl-based superconductors were characterized with respect to critical temperatures, critical currents, microstructure and composition of the superconducting and secondary phases. The samples were then analyzed by Moessbauer 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 electric field gradient derived from the 151Eu spectra were consistent with Eu3+ at the Ca site. The 57Fe Moessbauer 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.

AB - The introduction of the Moessbauer nuclei 57Fe, 119Sn and 151Eu into Tl-based 12(n-1)n superconductors was investigated. The doped Tl-based superconductors were characterized with respect to critical temperatures, critical currents, microstructure and composition of the superconducting and secondary phases. The samples were then analyzed by Moessbauer 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 electric field gradient derived from the 151Eu spectra were consistent with Eu3+ at the Ca site. The 57Fe Moessbauer 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.

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