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Sintering and Microstructure of BaTiO3 Nano Particles Synthesized by Molten Salt Method

Authors
Lee, Chang-HyunShin, Hyo-SoonYeo, Dong-HunHa, Gook-HyunNahm, Sahn
Issue Date
5월-2016
Publisher
AMER SCIENTIFIC PUBLISHERS
Keywords
Nano BaTiO3; Molten Salt; Sintering
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.16, no.5, pp.5233 - 5238
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume
16
Number
5
Start Page
5233
End Page
5238
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/88795
DOI
10.1166/jnn.2016.12204
ISSN
1533-4880
Abstract
In order to establish thinner dielectric layers in thick film electronic components such as MLCC (Multilayer ceramic capacitor), BaTiO3 nanoparticles have been utilized. However, studies on the synthesis of nanoparticles smaller than 20 nm, the characteristics of the BaTiO3 powder, and the powder's sintering are lacking. Therefore, this paper aims to synthesize BaTiO3 particles smaller than 20 nm by using the molten salt method and evaluate the microstructure and dielectric properties by varying the sintering temperature from 750 degrees C to 1200 degrees C. Through the molten salt method and by using KOH-KCI mixed salt, 20 nm BaTiO3 powder was synthesized at a low temperature of 150 degrees C. Sintering the pellets formed from the synthesized 20 nm BaTiO3 nano powder led to the observation of an unusual phenomenon where the particles grew to approximate sizes below 850 degrees C where densification progressed. At sintering temperatures above 950 degrees C, particles that expanded into rod shapes were observed and these particles were identified to be unreacted TiO2 based on the results of the EDX (Energy Dispersive X-ray Spectroscopy) analysis and phase analysis results.
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