Study of optical and electrical properties of Mn doped ZnO films deposited by atmospheric barrier torch discharge technique on SiO2 substrates is reported for a wide range of Mn concentration (0.2–20 at.%). It was found that the growth of all Mn‐doped ZnO films contains secondary Mn2O3 phase even for the lowest manganese concentration (0.2%). When Mn concentration is in the range 0.2–4%, this secondary Mn2O3 phase does not conspicuously affect Raman spectra of ZnO evidencing that Mn is mostly incorporated into the ZnO host matrix. Increase of Mn concentration (8–20%) is accompanied by formation of Mn2O3 clusters manifesting itself in the appearance of a corresponding mode in the Raman spectra. These clusters influence dramatically optical and electrical properties of the films. The Mn “solubility limit” for the films growth technique used is determined to be near 8%.
SrTiO3 nanoparticles can be prospective materials for different physical, chemical and technical applications as dielectric components, materials for catalysis and optics. Particle control may lead to new effects especially when the size becomes comparable with the fundamental dimensional characteristics such as domain size, exciton or electron length, i.e. at the level of nanomaterials. The powders of titanate with perovskite structure and particle size of 5-60 nm were obtained by solvothermal or citrate sol gel methods. The tendency to the lattice constant increase with particle size decrease was observed. However, the dependence of optical gap on the particle size looked unusually which was connected with the structure modifications during sample processing. It was also observed that the finest 5 nm powders contained significant lack of Sr, but perovskite structure was preserved. After thermal treatment TiO2 formation was found, likely providing a composite with ultrafine SrTiO3 nanoparticles inside TiO2 shell.
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