undoped and mn-doped zno nanoparticles were successfully prepared by the hydrothermal method with different annealing temperature conditions. structural, chemical and optical properties of the samples were studied by x-ray diffraction (xrd), field emission scanning electron microscopy (fesem), uv-vis spectrophotometry and fourier transform infrared (ft-ir) spectroscopy. the phase purity was con...

CdSe/CdS nanocrystals (NCs) are among the most studied semiconductor nanocrystals, yet there is still much information to be gained. This work reveals that core@shell NCs with different shapes more controlled by interaction between NC surface and capping ligands than core concentration, but not at all difference in crystalline nature of core. Among precursors, cadmium carboxylates promote an is...

The first production of weakly agglomerated zinc selenide nanopowders by evaporation a target the required chemical composition in argon using fiber ytterbium laser is reported. Nanoparticles have shape polyhedrons and, more rarely, spheres with an average size 18 nm. According to XRD data, obtained contain two phases: stable cubic phase (sphalerite, 40 wt.%) and metastable hexagonal (wurtzite,...

In the present work, CuInS2 nanoparticles have been successfully synthesized by water-bath method with deionized water as solvent and thioglycolic acid as complexing agent at 80°C. The phase transition of CuInS2 from chalcopyrite to wurtzite was realized by adjusting the pH value of reaction solution. The emergence of Cu2S in the condition of higher pH value of reaction solution led to the form...

Znl_xMg$e crystals were grown in the range extending up to x’ = 0.615 and characterized using the X-ray diffraction and electron probe microanalysis. Below x=0.2 there is a phase transition from sphalerite to wurtzite. The lattice constants are found to exhibit linear dependence on x for both, the sphalerite and wurtzite structure types. For compositions close to the phase transition, the forma...

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The mechanism responsible for the wurtzite-to-rocksalt structural phase transition in zinc oxide has been studied through the ab initio calculations of the full phonon properties. We derive a new and general path of the transformation from the parent to the daughter phase which involves an intermediate tetragonal phase. This hypothesis has been tested through analogous calculations on other wid...