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Minority anion substitution by Ni in ZnO
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View: Figures


Image of FIG. 1.
FIG. 1.

Reduced of the fits to the experimental emission yields in the vicinity of the , and [ ] directions (following 300 °C annealing). Each data point corresponds to the best fit obtained using two given sites, with the corresponding two fractions as free parameters. The site pairs are composed of S plus each of the simulated sites along the -axis (depicted above the plot): the S and the T sites, the BC and AB sites along the -axis, and a number of intermediate positions. The -axis corresponds to the position (along the -axis) of the non-S site used in each fit. The reduced (-axis) of these two-site fits are normalized to that of the one-site (S) fit. The non-equivalent rows of Zn and O atoms, projected on the plane perpendicular to each of the axes, are also shown (). Note that the separation between Zn and O rows is maximized along the [ ] axis.

Image of FIG. 2.
FIG. 2.

(a)–(d) Normalized experimental Ni β emission channeling patterns in the vicinity of the [0001], , and [ ] directions following annealing at 300 °C. (e)–(h) Corresponding best fits with 21% and 79% of the Ni atoms on S and S sites, respectively.

Image of FIG. 3.
FIG. 3.

Fractions of Ni impurities on S and S sites following each annealing step.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Minority anion substitution by Ni in ZnO