Abstract
A new equation relating oxygen contenty to copper valence 2+p has been derived and proposed. Compared to the previous equation, there is a corrected function in the new equation. The corrected function depends on dopant contentx and copper oxidation levelp. As a metalM is substituted for the metal of the sample, the corrected function has a different form, and the function is discussed in detail. For each case, taking high-T c cuprate for example, itsp is determined andy calculated by the new and previous equations. Changes in the corrected function are shown in the figures. All the discussions show that it is necessary to use the new equation to calculatey if we are to get accurate experiment results. The new equation can be widely applied to calculate the oxygen content of multicomponent doped or undoped cuprates, and the exact stoichiometries and superconducting or impurity phases of samples need not be known.
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