Title: Influence of Al, Fe, and Cu on the microstructure, diffused reflectance, THz, and dielectric properties for ZnTiO₃ nanocrystalline

Authors: Ahmed M. Bakr; Ali B. Abou Hammad; Ahmed R. Wassel; Amany M. El Nahrawy; A.M. Mansour

Addresses: Spectroscopy Department, Physics Research Division, National Research Centre, 33 El Bohouth St., Dokki, Giza, 12622, Egypt ' Solid State Physics Department, Physics Research Division, National Research Centre, 33 El Bohouth St., Dokki, Giza 12622, Egypt ' Thin Film and Electron Microscope Department, Physics Research Division, National Research Centre, 33 ElBehouth St., Dokki, Giza, 12622, Egypt ' Solid State Physics Department, Physics Research Division, National Research Centre, 33 El Bohouth St., Dokki, Giza 12622, Egypt ' Solid State Physics Department, Physics Research Division, National Research Centre, 33 El Bohouth St., Dokki, Giza 12622, Egypt

Abstract: Structural, diffused reflectance, THz, and dielectric features of perovskite ZnTiO₃ (doped with 5 mol.% of Al, Cu, and Fe) prepared using the sol-gel and calcined at 800°C have been investigated. The Al, Cu, and Fe can replace the titanium ions and form sols solutions in the ZnTiO₃ phase, and the spectroscopic and dielectric of the ZnTiO₃ peaks changed with the dopant addition. X-ray diffraction patterns elucidate the creation of the ZnTiO₃ rhombohedral phase, while the introduction of Al and Fe within the ZnTiO₃ structure is composed of two phases identified as cubic phase Zn₂TiO₄ structure and TiO₂ besides the rhombohedral of zinc-titanate. The various dopants induce a surface morphology modification observed by SEM. Diffusive reflection for ZnTiO₃ doped Al, Cu, and Fe indicated higher transparent over the wavelength 400 nm which making them a choice as excellent transparent semiconductor oxides for different optoelectronic applications. The electric modulus has the least values nearly reach zero at low frequency denoting that a neglected contribution of electrode polarisation to the total polarisation. THz and dielectric performance of a material is closely related to its composition and microstructure.

Keywords: ZnTiO₃-perovskite; sol-gel method; diffused reflectance; terahertz; dielectric.

DOI: 10.1504/IJMATEI.2021.115604

International Journal of Materials Engineering Innovation, 2021 Vol.12 No.2, pp.115 - 133

Received: 12 Sep 2020
Accepted: 19 Oct 2020
Published online: 11 Jun 2021 *

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