Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Determination of the Copper Valency and the Oxygen Deficiency in the High Tc Superconductor, $YBa_2Cu_3O_{7-\delta}$

  • Choy, Jin-Ho (Department of Chemistry and Physics, Seoul National University) ;
  • Choi, Suk-Yong (Department of Chemistry and Physics, Seoul National University) ;
  • Byeon, Song-Ho (Department of Chemistry and Physics, Seoul National University) ;
  • Chun, Sung-Ho (Department of Chemistry and Physics, Seoul National University) ;
  • Hong, Seung-Tae (Department of Chemistry and Physics, Seoul National University) ;
  • Jung, Duk-Young (Department of Chemistry and Physics, Seoul National University) ;
  • Choe, Won-Young (Department of Chemistry and Physics, Seoul National University) ;
  • Park, Yung-Woo (Department of Chemistry and Physics, Seoul National University)
  • Published : 1988.10.20
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Abstract

The ratio of trivalent to divalent copper has been determined by the redox titration for two superconducting phases of $YBa_2Cu^{3+}_{2x}Cu^{2+}_{3-2x}O_{6.5+x}$ with the onset temp. of 60K (x = 0.23 ${\pm}$ 0.01) and 90K (x = 0.35 ${\pm}$ 0.02), and for the insulating one (x ${\cong}$ 0) which was kept in an ambient atmosphere for 72 hrs. It is found that $T_c$, and the ratio of $Cu^{3+}/Cu^{2+}$ depend strongly on the annealing temperature and time. A typical orthorhombic phase can easily be obtained by a slow cooling or stepwise cooling at $PO_2$ = 1 atm, and shows a high Tc (ca. 90K) superconductivity.

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References

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Cited by

  1. ChemInform Abstract: Determination of the Copper Valency and the Oxygen Deficiency in the High Tc Superconductor, YBa2Cu3O7‐δ. vol.20, pp.12, 1989, https://doi.org/10.1002/chin.198912021
  2. X-ray Photoelectron Spectroscopic Evidence for Cu3 Valence State in Superconducting Phase, YBa2Cu3O7-&dgr; vol.184, pp.1, 1988, https://doi.org/10.1080/00268949008031739