Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties

By M. Abdullah, F. Rajab, Saleh M. Al-Abbas. 2014

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The structural, optical and dielectric properties of as-grown Cr2O3 nanostructures are demonstrated in this paper. Powder X-ray diffractometry analysis confirmed the rhombohedral structure of the material with lattice parameter, a = b = 4.953 A; c = 13.578 A, and average crystallize size (62.40 ± 21.3) nm. FE-SEM image illustrated the mixture of different shapes (disk, particle and rod) of as-grown nanostructures whereas; EDS spectrum confirmed the elemental purity of the material. FTIR spectroscopy, revealed the characteristic peaks of Cr–O bond stretching vibrations. Energy band gap (3.2 eV) of the nanostructures has been determined using the results of UV-VIS-NIR spectrophotometer. The dielectric properties of the material were checked in the wide frequency region (100Hz-30 MHz). In the low frequency region, the matrix of the dielectric behaves like source as well as sink of electrical energy within the relaxation time. Low value of dielectric loss exhibits that the materials posses good optical qualit...

Subfields: Inorganic Chemistry, Materials Chemistry, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/eef25cf145bd1088fb1397c0922bba59902c8d5a