One high temperature superconductor has the general formula YBa2Cu3Ox The
One high- temperature superconductor has the general formula YBa2Cu3Ox. The copper is a mixture of Cu(II) and Cu(III) oxidation states. This mixture of oxidation states appears vital for high temperature superconductivity to occur. A simple method for determining the average copper oxidation state has been reported [D. C. Harris, M. E. Hillis, and T. A. Hewston, J. Chem. Educ. 64, 847(1987)]. The described analysis takes place in two steps:
i. One superconductor sample is treated directly with I2:
Cu2+(aq) + I2(aq) → CuI(s) + I3-(aq)(Unbalanced)
Cu3+(aq) + I2(aq) → CuI(s) + I3-(aq) (Unbalanced)
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