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Zn1−xCrxO nanoparticles with x = 0.0, 0.01, 0.03 and 0.05 were synthesized by the sol–gel technique. Powder X-ray diffraction (XRD) studies reveal that chromium (Cr) incorporates into the ZnO crystal lattice without disturbing the parent hexagonal (wurtzite) structure. Transmission electron microscopy (TEM) measurements show that the average size of these nanoparticles is in the range 15–25 nm...
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