Abstract
Local structures in zinc oxide (ZnO) doped with In ions were investigated by means of the time-differential perturbed angular correlation (TDPAC) method with the 111Cd(← 111In) probe. Indium-concentration dependence of the TDPAC spectra suggests that the local structures formed by the impurities are sensitive to their population in the system: In ions occupy defect-free Zn sites when doped with a trace amount; they locally form microscopic unique structures widely dispersed in ZnO at 0.05 at. % or higher; and other compounds are formed at the In concentration as high as 10 at. %. Their characteristic structures are discussed based on the hyperfine-interaction parameters.
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