Acoustic-chemical synthesis of nanosized BaTiO3 and its dielectric response

2^nd International Conference and Exhibition on Materials Science and Chemistry

July 13-14, 2017 Berlin, Germany

Hatice Zehra Akbas

Mustafa Kemal University, Turkey

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Ultrasonication is an advanced process used to obtain sub-micron size powders because the collapsing of bubbles creates hot spots with about 5000 K and 1000 atm pressure in the liquid, which separates the particles from each other during the process. Ultrasonication has been used successively for deagglomeration, degassing, and homogenization for a decade. Crystallize phase of BaTiO3 ceramics that ultrasonication method used to homogenize and deagglomerize the reagents were better than the ceramics using a mechanical method after the solid-state reaction. The structure of samples without carbonate impurities was verified using Fourier transform infrared spectroscopy (FT-IR) and X-ray diffractometer (XRD). Scanning electron microscopy (SEM) analysis of the powders showed that using ultrasonic deagglomeration greatly decreased the particle size with perfect homogeneity in the shortest time. The particle size of the powders was calculated as 44.7 and 80.4 nm for ultrasonic and mechanochemical deagglomeration, respectively. The sintered pellet from the ultrasonic method had no abnormal grain growth, and the grain sizes were between 10- 30 �?¼m. The pellet from the mechanical method had an abnormal grain growth, and the grain sizes were between 10-100 �?¼m. The complex permittivity (�?µ' and �?µ'') and the AC conductivity (Ï�?') of the samples were analyzed in a wide frequency range of 20 Hz-2 MHz at room temperature. Using acoustic method reduced �?µ' a little but decreased �?µ'' that well enough. The method can make a significant improvement to produce high purity homogeneous BaTiO3 ceramics without carbonate impurities with a small dielectric loss.

Biography :

Email: hatice-akbas@windowslive.com