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Sn and Fe Mossbauer Spectra of Y Ba Cu (O, N)

Published online by Cambridge University Press:  28 February 2011

M. DeMarco ,
X. W. Wang ,
G. Trbovich ,
M.J. Naughton  and
M. Chaparala
M. DeMarco
Affiliation:
Buffalo State College
X. W. Wang
Affiliation:
Alfred University
G. Trbovich
Affiliation:
Buffalo State College
M.J. Naughton
Affiliation:
SUNY at Buffalo
M. Chaparala
Affiliation:
SUNY at Buffalo
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Abstract

We report new results on 119 Sn and 57 Fe Mossbauer spectra of Y1 Ba2 Cu3-z (O, N)7-x, where M is either Sn or Fe, O denotes oxygen and N denotes ni trogen, 0 ≤ X ≤ 0.5, and z = 0.05, 0.1, 0.15, 0.2. The oxygen annealed samples were superconductors, but nitrogen annealed samples were not. The Mossbauer measurements indicate four quadrupole pairs in Y Ba2 (Cu, Fe)3 O7-x, but only three pairs in Y1 Ba2 (Cu, Fe)3 N6.5. In the Sn Mossbauer spectra, the quadrupole splittings of nitrogen annealed samples are larger than that of oxygen annealed samples. In both Fe and Sn spectra, the isomer shifts of oxygen annealed samples are different from that of nitrogen annealed samples. Our study provides some information about the Cu(1) and Cu(2) sites and their surrounding environment in the Y Ba Cu system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1025
Copyright
Copyright © Materials Research Society 1990

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References

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