![]() These two aspects are related to the mechanism of the oxide formation from the hydroxide. The uniform strain related to the mean lattice parameter variation appears to be related to the small crystallite size. The non-uniform strain is mainly due to the mosaic texture of the grains. It appears from the comparison of the results that uniform and non-uniform strains are insensitive to the extent of deviation from stoichiometry. Keywords: Nickel Oxide nanoparticles XRD SEM TGA-DTA. and the first minimum of the diffraction pattern on a screen 5 m away. Correlations between uniform strain, non-uniform strain, texture and stoichiometry have been researched. analysis which showed NiO nanoparticles formed between 130-720C. By definition, one millimeter is equivalent to 1/1000 meter or 1 x 10 The key. Deviations from stoichiometry have been obtained from chemical analysis. Crystallite sizes and microstrain values have been obtained from X-ray line broadening analysis. The textures of the three kinds of oxides have been inferred from electron microscopy and diffraction and X-ray diffraction. These samples are black non-stoichiometric NiO with a mosaic texture, a green stoichiometric NiO with the same mosaic texture and black non-stoichiometric NiO made up of tiny quasi-perfect single crystals (monolithic NiO). Twelve samples of three kinds of highly divided nickel oxide, prepared from nickel hydroxide at low temperature, have been compared from the double point of view of mean lattice parameter variation (uniform strain) and lattice microstrains (non-uniform strain).
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