Pure ZnO and Zn1-xMnxO (x=0, 0.02, 0.06, 0.10, 0.15) nanopowders have been synthesized by sol gel technique at low temperatures. XRD results indicate that the powder has a hexagonal polycrystalline structure without secondary phases. The nanopowders were characterized using the Xray diffraction (XRD) and transmission electron microscopy (TEM) observation. Kramers-Kronig`s analysis of mid-IR reflectance spectra were employed to determine the doping effect on the optical constants and optical phonon modes frequencies. The optical band gap energy decreases from 3.22 eV to 3.12 eV for pure ZnO and Zn0.9Mn0.1O dispersed powders, respectively.

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