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J. Korean Ceram. Soc. > Volume 57(2); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(2): 213-219.
doi: https://doi.org/10.1007/s43207-020-00015-2
Dielectric properties of BaTiO3 nanocrystals synthesized by ambient‑condition‑sol process at low temperatures
Wooje Han1, Jiwan Kim2 , Hyung‑Ho Park1
1Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
2Department of Advanced Materials Engineering, Kyonggi University, Suwon‑si 16227, Republic of Korea
Correspondence  Jiwan Kim ,Email: jiwank@kyonggi.ac.kr
Hyung‑Ho Park ,Email: hhpark@yonsei.ac.kr
Received: November 19, 2019; Revised: December 9, 2019   Accepted: December 11, 2019.  Published online: February 29, 2020.
ABSTRACT
Barium titanate nanocrystals were synthesized via an ambient-condition-sol (ACS) process using low temperature heat reflux. The prepared nanocrystals were characterized using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, particle size analysis, and capacitance–voltage measurements to investigate their crystal structure, chemical bonding, size distribution, and structural, dielectric, and electrical properties. The ACS process was carried out at temperatures lower than 100 °C to avoid the agglomeration of the nanocrystals. Because of the low temperature used in this study, small barium titanate nanocrystals were obtained (average size ranged from 280 to 120 nm). The bigger barium titanate nanocrystals showed higher dielectric constant than the smaller ones (size of up to 140 nm).
Key words: BaTiO3 · Dielectric properties · Nanocrystals · Size control
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