Effects of ultrasonication and conventional mechanical homogenization processes on the structures and dielectric properties of BaTiO3 ceramics

• Published in: Ultrasonics Sonochemistry
• Main Authors: Akbaş, Hatice Zehra, Aydın, Zeki, Yılmaz, Onur, Turgut, Selvin
• Other Authors: İskenderun Teknik Üniversitesi
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2017
• Subjects: Barium titanate; Dielectric properties; Ultrasonication; Mechanical milling; Homogenization process; Acoustics; Chemistry; Multidisciplinary; Electrical-properties; Barium; Microstructure; Nanostructures; Densification; Niobium; Size; Ceramic materials; Crystal impurities; Dielectric losses; Fourier transform infrared spectroscopy; Mechanical alloying; Milling (machining); Niobium compounds; Permittivity; Powders; Solid state reactions; Ultrasonic waves; X ray diffraction; X ray powder diffraction; Acoustic cavitations; High-intensity ultrasonic wave; Solid state reaction method; Ultra-sonication; Ultrasonic homogenization; Wide frequency range; Homogenization method; Barium derivative; Carbonic acid; Titanium derivative; Ceramics; Chemical bond; Dielectric constant; Infrared spectroscopy; Particle size; Polarization; Solid state; Structure analysis; Electric conductivity; Priority journal; Harran
• Online Access: https://hdl.handle.net/20.500.12508/784; https://doi.org/10.1016/j.ultsonch.2016.07.027

WOS: 000387626500095 27773315 The effects of the homogenization process on the structures and dielectric properties of pure and Nb-doped BaTiO3 ceramics have been investigated using an ultrasonic homogenization and conventional mechanical methods. The reagents were homogenized using an ultrasonic processor with high-intensity ultrasonic waves and using a compact mixer-shaker. The components and crystal types of the powders were determined by Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analyses. The complex permittivity (epsilon', epsilon'') and AC conductivity (sigma') of the samples were analyzed in a wide frequency range of 20 Hz to 2 MHz at room temperature. The structures and dielectric properties of pure and Nb-doped BaTiO3 ceramics strongly depend on the homogenization process in a solid-state reaction method. Using an ultrasonic processor with high-intensity ultrasonic waves based on acoustic cavitation phenomena can make a significant improvement in producing high-purity BaTiO3 ceramics without carbonate impurities with a small dielectric loss. (C) 2016 Elsevier B.V. All rights reserved. scientific research projects coordination units at Mustafa Kemal University [326] This research was supported by the scientific research projects coordination units at Mustafa Kemal University (Grant no = 326). The authors are grateful to MARGEM, Mustafa Kemal University, for helping to collect SEM data and LCR data. The authors gratefully acknowledge support from HUMEL, Harran University, for helping to collect XRD data.