Structural and optical characterization of Cr{sub 2}O{sub 3} nanostructures: Evaluation of its dielectric properties

• Published in: AIP advances 2014-02, Vol.4 (2)
• Main Authors: Abdullah, M. M., Department of Physics, College of Science and Arts, Najran University, P.O. Box 1988, Najran, 11001, Rajab, Fahd M., Department of Chemical Engineering, College of Engineering, Najran University, P.O. Box 1988, Najran, 11001, Al-Abbas, Saleh M.
• Format: Article
• Language: English
• Subjects: CHROMATES; CHROMIUM OXIDES; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; FOURIER TRANSFORMATION; INFRARED SPECTRA; MATERIALS SCIENCE; NANOSTRUCTURES; SCANNING ELECTRON MICROSCOPY; TRIGONAL LATTICES; X-RAY DIFFRACTION
• ISSN: 2158-3226; 2158-3226
• DOI: 10.1063/1.4867012

The structural, optical and dielectric properties of as-grown Cr{sub 2}O{sub 3} 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 Å; c = 13.578 Å, 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 quality with lesser defects. The ac conductivity of the material in the high frequency region was found according to frequency power law. The physical-mechanism and the theoretical-interpretation of dielectric-properties of Cr{sub 2}O{sub 3} nanostructures attest the potential candidature of the material as an efficient dielectric medium.