Enhanced dielectric properties of Nanocrystalline Ba(1-x)SrxTiO3 (x=0 and 0.3) ceramics

2nd international Tropical Renewable Energy Conference 2017

Yustanti, E.^1 ; Hafizah, M.A.E.^2 ; Manaf, A.^2

Department of Metallurgy, Faculty of Engineering, University of Sultan Ageng Tirtayasa, Cilegon Banten

42435, Indonesia^1

Department of Physics, FMIPA Universitas Indonesia, Depok

16424, Indonesia^2

关键词: Barium titanates (BTO);    Crystalline powder;    High-power ultrasonics;    Mechanically alloyed;    Partial substitution;    Ultrasonic treatments;    Ultrasound irradiation;    X ray diffractometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/105/1/012072/pdf
DOI  :  10.1088/1755-1315/105/1/012072

来源: IOP

【 摘 要 】

In this paper, we report the enhancement of the dielectric constant of barium titanate (BTO) through partial substitution of strontium to barium and crystallite size reduction through a high power ultrasonic treatment. The sample under investigation is Ba1-xSrxTiO3or BST with x = 0 and 0.3 compositions prepared through mechanical alloying of SrCO3, BaCO3and TiO2precursors as the feedstock. All mechanically alloyed samples were crystalline powders with a single phase as confirmed by an x-ray diffractometer (XRD). The mechanically alloyed materials were consisted of multi-crystallite particles as confirmed both by XRD data analysis and particle size evaluation. Subject to an additional ultrasonic treatment, the multi-crystallite particles were fragmented toward mono-crystallite particles with the mean crystallite size about 52 nm after 12 hours irradiation. Even a smaller mean crystallite size (18 nm) with a narrower crystallites distribution then that of BTO was obtained in Ba1-xSrxTiO3with x = 0.3. Such a narrow crystallite size distribution with a small mean crystallite size has superior dielectric constant over those of BTO and doped BTO with a large mean crystallite size. The highest dielectric constant of 3000 was obtained at a frequency of 273 Hz in doped BTO after 12 hours ultrasonic irradiation. The value is 12 times higher than those of BTO and doped BTO with a large crystallite size.