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(Color online) XRD patterns (log-scale) of both Cr-doped ZnO (a) films and (b) powders; and the lattice volume of (c) films and (d) powders. Also shown in (b) is the standard diffraction pattern of wurtzite hexagonal ZnO (powder diffraction file number 79-2205). “” represents the peaks of the impurity phase of .
(Color online) (a) Hysteresis loops of film measured at 5 and ; (b) magnetization of samples at ; (c) ZFC/FC curves for film measured at ; and (d) magnetization curves as functions of the magnetic field for powders at .
(Color online) Magnetization curves of film before and after annealing in vacuum and air measured at . The bottom inset is the magnetization of Cr atom with different x at different annealing temperatures in air.
(Color online) Fitting and experimental data for RT PL spectra of films: (a) as deposited, (b) annealing at 200 and (c) in air, and annealing at in vacuum for . The dashed lines are Gaussian fitting of , , , , and , respectively.
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