Thin lms of MnO2, Mn2O3, and Mn3O4 have been grown from single precursor solution by varying the post-annealing condition on the glass and corning substrate using a solgel technique. By annealing in air and at temperature between 600 and 800• C, cubic Mn2O3 lms could be formed. The lms were thermally annealed at dierent temperatures between 300 and 800• C to create dierent crystalline structure. Even under the air-annealing condition, Zn doping results in a structural transformation from cubic ZnxMn2−xO3 to tetragonal ZnxMn3−xO4. X-ray diraction, atomic force microscopy, and UV-visible spectra were used to characterize the eect of thermal annealing on the optical and structural properties of a Zn doped manganese oxide thin lm. Optical properties of the Mn2O3 and Mn3O4 lms have been investigated by pointwise unconditioned minimization approach.
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