Study on the effect of Bi dopant on the structural and optical properties of BaTiO3 nanoceramics synthesized via sol-gel method. (April 2020)

• Record Type: Journal Article
• Authors: Tihtih, M; Ibrahim, J F M; Kurovics, E; Abdelfattah, M
• Is Part Of: Journal of physics. Volume 1527(2020)
• Publication Date: 2020-04
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1527/1/012043
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: In this study the preparation of pure and Bismuth (Bi) doped barium titanate (BaTiO3 ) nanoceramics by sol-gel process is reported. The structural and optical properties of the samples were investigated using X-ray diffraction (XRD) and UV-visible spectroscopy. XRD results show that the samples are crystallized in the pure perovskite structure when calcined at relatively low temperature (800 °C) for 3 h, without the presence of secondary phases. Both Bi doping (1%, 2%) decrease the lattice parameters, tetragonality and the crystallite size. The decrease of their sizes can be explained by the replacement of large ionic radii of Ba 2+ (1.35Å) ion by smaller ionic radii Bi 3+ (1.03 Å) ion. A close investigation of the results shows that BT is a tetragonal-phase ferroelectric. The band gap of the Bi-doped BaTiO3 nanopowders is lower compared to that of pure BaTiO3, as determined from the analysis of UV absorbance spectra.