### Determination of Depth Profile of $CuO^{+}$ and $Cu^{+}$ in Superconductors by a Wet-Chemical Method Using Flow-CoulometryDetermination of Depth Profile of $CuO^{+}$ and $Cu^{+}$ in Superconductors by a Wet-Chemical Method Using Flow-Coulometry

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 Author Sasaki, Yuji Source J-STAGE Content type Text Publisher The Japan Society for Analytical Chemistry Language English
 Abstract Using a wet-chemical method based on flow-coulometry, an analytical method to measure unstable ions of copper, $CuO^{+}$ and $Cu^{+},$ in superconductors has been advanced. The distributions of these ions from the surface to inside of sample discs were determined by the developed method. The sample discs, which were prepared by the ceramic method, contained a lower $CuO^{+}/Cu_{total}$ ratio at the outermost surface, and gradually increased to a depth of 200 µm. On the contrary, the $Cu^{+}/Cu_{total}$ ratio in a $YBa_{2}Cu_{3}O_{6}$ sample was almost homogeneous. The positively electrolyzed $La_{2}CuO_{y}$ disc as an electrode exhibited a much higher oxidation state than that without electrolysis. It was confirmed that the $CuO^{+}/Cu_{total}$ ratio on the surface and in the bulk of the electrolyzed $La_{2}CuO_{y}$ had an influence on the superconducting characteristics. ISSN 09106340 Learning Resource Type Article Publisher Date 1999-01-01 e-ISSN 13482246 Journal Analytical Sciences(analsci) Volume Number 15 Issue Number 5 Page Count 5 Starting Page 421 Ending Page 425