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Room temperature x-ray powder diffraction patterns for samples. Stars denote the reflection from the hexagonal .
(a) -edge EXAFS oscillation functions and (b) their Fourier transforms for , CoO, and powders. In (b) the simulated spectra for the Co-doped and phases are also shown as references. The empty circles show the fitting results.
Formation energies for tetragonal and hexagonal structures with various doping concentrations.
Fitting structure parameters around Co atoms in powders.
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