Mossbauer spectroscopy and preparation of Hg-1223, Tl-1223 and Tl-1212 superconductors

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Abstract

Introduction of the Mossbauer nuclei 57Fe into Hg-1223 phase and that of 57Fe and 151Eu into Tl-1212 and Tl-1223 superconductors were investigated. Samples of high phase purity were obtained. Scanning electron microscopy and optical microscopy in normal and polarized light were employed to study the microstructure of the specimens. Energy dispersive X-ray analysis showed that 57Fe in the Hg-based samples and 57Fe as well as 151Eu in the Tl-based compounds, entered superconducting phases. Incorporation of Eu3+ into the superconducting phase favored the formation of the Tl-1212 phase. Mossbauer spectroscopy showed that Eu3+ entered the Ca-site. Two doublets found in the 57Fe Mossbauer spectra in both the Hg-1223 and the Tl-1223 phase referred to two different micro-environments of Fe3+. The assignment of the 57Fe Mossbauer spectra was made under the assumption that Fe favored the 1223 phase. Fe3+ may replace Cu in both the square pyramidal, five-fold oxygen coordinated Cu sites between the Ca and Ba-(Sr)-O layers, and in the square planar, four-fold oxygen coordinated Cu sites the Ca layers in the superconducting phases in both the Hg- and the Tl-based materials. From the relative areas of the two doublets, we concluded that the Fe3+ preferred the square planar Cu site.

Original languageEnglish
Pages (from-to)107-112
Number of pages6
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume246
Issue number1
DOIs
Publication statusPublished - 2000

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Mossbauer Spectroscopy
Mossbauer spectroscopy
Superconducting materials
Oxygen
Energy dispersive X ray analysis
Light polarization
Electron Scanning Microscopy
Optical microscopy
Microscopy
X-Rays
Light
Microstructure
Scanning electron microscopy
Superconductivity

ASJC Scopus subject areas

  • Analytical Chemistry
  • Inorganic Chemistry
  • Nuclear Energy and Engineering

Cite this

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title = "Mossbauer spectroscopy and preparation of Hg-1223, Tl-1223 and Tl-1212 superconductors",
abstract = "Introduction of the Mossbauer nuclei 57Fe into Hg-1223 phase and that of 57Fe and 151Eu into Tl-1212 and Tl-1223 superconductors were investigated. Samples of high phase purity were obtained. Scanning electron microscopy and optical microscopy in normal and polarized light were employed to study the microstructure of the specimens. Energy dispersive X-ray analysis showed that 57Fe in the Hg-based samples and 57Fe as well as 151Eu in the Tl-based compounds, entered superconducting phases. Incorporation of Eu3+ into the superconducting phase favored the formation of the Tl-1212 phase. Mossbauer spectroscopy showed that Eu3+ entered the Ca-site. Two doublets found in the 57Fe Mossbauer spectra in both the Hg-1223 and the Tl-1223 phase referred to two different micro-environments of Fe3+. The assignment of the 57Fe Mossbauer spectra was made under the assumption that Fe favored the 1223 phase. Fe3+ may replace Cu in both the square pyramidal, five-fold oxygen coordinated Cu sites between the Ca and Ba-(Sr)-O layers, and in the square planar, four-fold oxygen coordinated Cu sites the Ca layers in the superconducting phases in both the Hg- and the Tl-based materials. From the relative areas of the two doublets, we concluded that the Fe3+ preferred the square planar Cu site.",
author = "E. Kuzmann and M. Mair and Z. Klencs{\'a}r and Z. Homonnay and A. V{\'e}rtes and G. Gritzner",
year = "2000",
doi = "10.1023/A:1006797417970",
language = "English",
volume = "246",
pages = "107--112",
journal = "Journal of Radioanalytical and Nuclear Chemistry",
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TY - JOUR

T1 - Mossbauer spectroscopy and preparation of Hg-1223, Tl-1223 and Tl-1212 superconductors

AU - Kuzmann, E.

AU - Mair, M.

AU - Klencsár, Z.

AU - Homonnay, Z.

AU - Vértes, A.

AU - Gritzner, G.

PY - 2000

Y1 - 2000

N2 - Introduction of the Mossbauer nuclei 57Fe into Hg-1223 phase and that of 57Fe and 151Eu into Tl-1212 and Tl-1223 superconductors were investigated. Samples of high phase purity were obtained. Scanning electron microscopy and optical microscopy in normal and polarized light were employed to study the microstructure of the specimens. Energy dispersive X-ray analysis showed that 57Fe in the Hg-based samples and 57Fe as well as 151Eu in the Tl-based compounds, entered superconducting phases. Incorporation of Eu3+ into the superconducting phase favored the formation of the Tl-1212 phase. Mossbauer spectroscopy showed that Eu3+ entered the Ca-site. Two doublets found in the 57Fe Mossbauer spectra in both the Hg-1223 and the Tl-1223 phase referred to two different micro-environments of Fe3+. The assignment of the 57Fe Mossbauer spectra was made under the assumption that Fe favored the 1223 phase. Fe3+ may replace Cu in both the square pyramidal, five-fold oxygen coordinated Cu sites between the Ca and Ba-(Sr)-O layers, and in the square planar, four-fold oxygen coordinated Cu sites the Ca layers in the superconducting phases in both the Hg- and the Tl-based materials. From the relative areas of the two doublets, we concluded that the Fe3+ preferred the square planar Cu site.

AB - Introduction of the Mossbauer nuclei 57Fe into Hg-1223 phase and that of 57Fe and 151Eu into Tl-1212 and Tl-1223 superconductors were investigated. Samples of high phase purity were obtained. Scanning electron microscopy and optical microscopy in normal and polarized light were employed to study the microstructure of the specimens. Energy dispersive X-ray analysis showed that 57Fe in the Hg-based samples and 57Fe as well as 151Eu in the Tl-based compounds, entered superconducting phases. Incorporation of Eu3+ into the superconducting phase favored the formation of the Tl-1212 phase. Mossbauer spectroscopy showed that Eu3+ entered the Ca-site. Two doublets found in the 57Fe Mossbauer spectra in both the Hg-1223 and the Tl-1223 phase referred to two different micro-environments of Fe3+. The assignment of the 57Fe Mossbauer spectra was made under the assumption that Fe favored the 1223 phase. Fe3+ may replace Cu in both the square pyramidal, five-fold oxygen coordinated Cu sites between the Ca and Ba-(Sr)-O layers, and in the square planar, four-fold oxygen coordinated Cu sites the Ca layers in the superconducting phases in both the Hg- and the Tl-based materials. From the relative areas of the two doublets, we concluded that the Fe3+ preferred the square planar Cu site.

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