Abstract
For cuprate superconductors, the Cu valency is a determining factor of the superconducting transition temperature (Tc). The Cu valence (v) of the superconductor YBa2Cu3Oy (YBCO) has been calculated from oxygen content (y) by the charge neutralization rule. The conventional methods for measuring the oxygen content are iodometry and coulometry. Recently, we developed a novel oxygen measuring method for La2-xSrxCuO4 that uses a dissolved oxygen sensor (the DO method). In this study, we examine whether the oxygen content of YBa2Cu3Oy can be determined by the DO method. The y value obtained by the DO method was compared with that obtained by the iodometric method. In addition, we developed a new correction method by applying the diffusion equation. After correction, the errors of v and y fit within 0.026 and 0.039, respectively. We found that DO method is effective for measuring the oxygen content of YBCO after correction.
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