O17nuclear-magnetic-resonance spectroscopic study of high-Tcsuperconductors

We have obtained solid-state ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ NMR spectra of a number of ${}_{}{}^{17}{}_{}{}^{}\mathrm{enriched}$ oxides and high-temperature oxide superconductors, including ${\mathrm{Cu}}_2^{\mathrm{I}}$O, ${\mathrm{Cu}}^{\mathrm{II}}$O, ${\mathrm{KCu}}^{\mathrm{III}}$ ${\mathrm{O}}_2$, ${\mathrm{Bi}}_2$ ${\mathrm{O}}_3$, ${\mathrm{Tl}}_2$ ${\mathrm{O}}_3$, ${\mathrm{La}}_{1.85}$ ${\mathrm{Sr}}_{0.15}$ ${\mathrm{CuO}}_4$, ${\mathrm{YBa}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{x}}$, ${\mathrm{Bi}}_2$ ${\mathrm{Sr}}_2$ ${\mathrm{CaCu}}_2$ ${\mathrm{O}}_{8+\mathrm{x}}$, ${\mathrm{Tl}}_2$ ${\mathrm{Ba}}_2$ ${\mathrm{CaCu}}_2$ ${\mathrm{O}}_{8+\mathrm{x}}$, and ${\mathrm{Ba}}_{0.6}$ ${\mathrm{K}}_{0.4}$ ${\mathrm{BiO}}_3$. Spectra of all of the simple diamagnetic oxides contain relatively sharp resonances in a ‘‘diamagnetic’’ region of ∼-200 to +700 ppm (from ${\mathrm{H}}_2$O, International Union of Pure and Applied Chemistry δ scale). ${\mathrm{Cu}}^{\mathrm{II}}$O exhibits a broad resonance centered at ∼4500 ppm.