Effect of bismuth replacement at barium site in Y-Ba-Cu-O system |
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Authors: | Ram Bilas |
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Affiliation: | (1) Department of Physics, Indian Institute of Technology, 208 016 Kanpur, India |
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Abstract: | X-ray diffraction, electron paramagnetic resonance, microwave absorption and resistivity measurements were carried out on YBa2?x Bi x Cu3O7 (0≤x≤0·5) superconductors in order to study the effect of bismuth on the structural and superconducting properties. A decrease in sintering temperature increased the amount of impurity phase. Transition from an orthorhombic (superconducting) phase to tetragonal structure produced no significant change in EPR zero-field signal at liquid nitrogen temperature (LNT). The non-resonance signal height decreased on higher concentration of bismuth. Sintered YBa2?x Bi x Cu3O7 superconductor had a strong EPR zero-field signal at LNT. We have evaluated particle size from XRD and EPR studies. The average particle size was about 0·4µm. |
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Keywords: | Oxide superconductor bismuth impurity microwave absorption |
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