Structural and optical properties of zinc oxide nanopowders doped with Mn

Abstract

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 X‐ray 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 (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Design of Catalysts for Glycolysis of Polyethylene Terephthalate from Spent Batteries

“…Moreover, a shift of (1 0 1) peak positions to lower 2θ angles was observed. The increasing lattice constants ( a and c ) and the unit cell volume cause the shift in peaks' position to lower angles [40] . Several authors have reported the increase in both lattice constants, a and c , with increase Mn percentage.…”

“…The increasing lattice constants (a and c) and the unit cell volume cause the shift in peaks' position to lower angles. [40] Several authors have reported the increase in both lattice constants, a and c, with increase Mn percentage. They explain this fact taking into account that the radius of Mn 2 + (0.66 Å) is larger than that of Zn 2 + (0.60 Å), both in a tetrahedral configuration.…”

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