New Method for Synthesis of Zinc Metaborate Zn4B6O13 Crystals via Sol-Gel Process and Investigation of DFT Calculations

International Journal of Bio-Inorganic Hybrid Nanomaterials

مقاله 2، دوره 1، شماره 2، تیر 2012، صفحه 79-86   

نوع مقاله: Research Paper

چکیده

In this work facile sol-gel (pechni) method has been successfully established to synthesize Zn4B6O13 nanocrystals which have cubic crystals with lattice parameter: a =7.48 A. The structure and morphology of the obtained material were studied by X-ray diffraction (XRD), Infrared spectra (IR), scanning electron microscopy (SEM) and photoluminescence analysis. The experimental results show a band gap of 3.306 eV for the synthesized materials. Density functional theory (DFT) calculations by GGA-PBE method show, the crystals belong to the semiconductors with an indirect energy band gap of about 3.289 eV. The calculated band gap using the GGA-PBE method is comparable with the experimental results. The optical properties include the dielectric spectra; absorption, reflectivity and energy-loss spectra, and the origin of spectral peaks were analyzed based on the electronic structures.

کلیدواژه‌ها

Zinc metaborate؛ nanocrystals, Sol-Gel؛ Photoluminescence, DFT calculations