YBa_2Cu_3O_(～7)高温超导体碘量滴定反应中“两电子氧化剂”的本质研究

The Nature of“Two-electron Oxidant”in lodometric Titration.of YBa_2Cu_3O_(～7) Superconductor

用 XPS 法和碘量法分析了 YBCO 超导体及有关化合物。结果表明 YBCO 超导体碘量滴定反应中的“两电子氧化剂”不是 Cu^(3+)离子,而可能是O_2^(2-)(或 O^(1-))种类的氧离子。

X-ray photoelectron spectrometry and iodometric titration techniques have been used to analyze YBa_2Cu_3O_(～7)(YBCO)superconductor and related compounds.The results of XPS analysis for YBCO superconductor and NaCuO_2 show that Cu^(3+) is not present in YBCO supsrconduetor.The results of iodometric titration show that all the high-T_5 super- conducting YBCO and related Ba-containing compounds annealed at 600℃ contain the“two- -electron oxidant”,whereas no“two-electron oxidant”can be determined in the Ba-free compound and YBCO compounds quenched by liquid nitrogen.Above results imply that the “two-electron oxidant”in iodometric titration of YBCO superconductor is not Cu^(3+)ion,but probably peroxide-like oxygen species.