Abstract
Nanocrystalline zirconium oxide powder was prepared by sol-gel method using zirconyl chloride octahydrate (ZrOCl2·8H2O) and ethylenediaminetetraacitic acid (EDTA) in ammonium hydroxide (NH4OH) solution. The as-synthesized complex product was annealed at 650°C, 750°C and 850°C for 2h to get fine ZrO2 powder. These samples were further analyzed by Scanning electron microscopy (SEM), X- ray diffraction (XRD), Energy-dispersive X- ray spectroscopy (EDX), UV-vis analysis, Fourier transform infrared (FT-IR) spectroscopy, Photoluminescence spectroscopy (PL) and Raman Spectroscopy to study their structural and optical properties. The structural studies revealed that nanocrystalline ZrO2 powder exhibits monoclinic phase with variation in crystallite size with annealing temperature. The UV–vis absorption band edge of ZrO2 decreases from 514nm to 451nm as annealing temperature rises from 650°C to 750°C. It seems that the drastic reduction in band gap energy may be one of the novel unexpected characteristics of ZrO2. The FTIR analyses further confirmed the formation of nanocrystalline monoclinic ZrO2. PL analysis revealed the novel emission peaks at 305 and 565nm. The Raman spectroscopy confirmed the transformation of amorphous zirconium hydroxide to m-ZrO2 with increase in temperature from 650°C to 850°C.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
