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Thin films of MnO_2, Mn_2O_3, and Mn_3O_4 have been grown from single precursor solution by varying the post-annealing condition on the glass and corning substrate using a sol-gel technique. By annealing in air and at temperature between 600 and 800°C, cubic Mn_2O_3 films could be formed. The films were thermally annealed at different temperatures between 300 and 800C to create different crystalline...