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Influence of feedstock concentration on tetragonality and particle size of hydrothermally synthesized barium titanate powders.

Influence of feedstock concentration on tetragonality and particle size of hydrothermally synthesized barium titanate powders.

Authors :
Li, Jian
He, Kai
Zhou, Zhi-Hui
Huang, Hao
Zhang, Lei
Yu, Hong-Yu
Lou, Chao-Gang
Source :
Ceramics International. Dec2017, Vol. 43 Issue 17, p14813-14817. 5p.
Publication Year :
2017

Abstract

Barium titanate (BaTiO 3 ) powders were synthesized through hydrothermal process with Ba(OH) 2 ·8H 2 O and TiO 2 . By increasing the feedstock concentration (FC) from 0.25 to 1.50 M, BaTiO 3 powders maintain a stable average particle size (~180 nm and ~6.4441 m 2 /g) with an increasing tetragonality ( c/a : 1.0065–1.0075). Johnson-Mehl-Avrami and standard reaction rate equations were adopted to analyze the kinetic process of BaTiO 3 formation. The reaction is governed by first-order and phase-boundary-controlled mechanism for 0.25 M and 1.50 M, respectively. Lower extent of reaction is believed to lead to the better tetragonality for BaTiO 3 powders fabricated with higher FC. On the other hand, the relative stable particle size is correlated with the unvaried nucleation frequency and grain growth rate with various FC. This work can provide a guideline to manipulate the properties of BaTiO 3 powders used in electronic industry. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02728842
Volume :
43
Issue :
17
Database :
Academic Search Index
Journal :
Ceramics International
Publication Type :
Academic Journal
Accession number :
125235530
Full Text :
https://doi.org/10.1016/j.ceramint.2017.07.229