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The determination of the excess oxygen content in high‐Tc superconductors is especially important. The efficiency of two new methods by which δ is determined directly has been demonstrated using the prototypic semiconductor YBa2Cu3O6.5+δ. In one method the shift of the Fe2⊕/Fe3⊕ concentration ratio is determined, whereas in the other the O2‐pressure after reaction of the oxide ceramic with water is measured.
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Maier et al. (1988) studied this question.
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