Effect of excess TiO2 on the phase evolution and densification of sol-gel derived (Ba,Sr)TiO3 powders

Haitao Huang; Wei Qiu; Ooi Kiang Tan; Weiguang Zhu; Li Min Zhou

doi:10.1007/s10832-006-9875-3

Effect of excess TiO₂ on the phase evolution and densification of sol-gel derived (Ba,Sr)TiO₃ powders

Haitao Huang^*, Wei Qiu, Ooi Kiang Tan, Weiguang Zhu, Li Min Zhou

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Nanoscaled (Ba_2/3Sr_1/3)Ti_{1 + x} O ₃ powders have been prepared by sol-gel technique. Their phase evolution and densification behaviors have been studied by differential thermal analysis (DTA) and high temperature dilatometer, respectively. It is found the addition of 2 mol%-excess amount of TiO₂ lowers the activation energy required for the formation of the perovskite phase by about 130 kJ/mol and thus lowers the crystallization temperature of BST powders. However, the excess amount of TiO₂ makes the nano-powder difficult to sinter. Transmission electron microscopy reveals that a metastable nano-porous layer has formed on the surface of TiO₂-excess nanopowder and this may account for the slow densification rate.

Original language	English
Pages (from-to)	337-341
Number of pages	5
Journal	Journal of Electroceramics
Volume	16
Issue number	4
DOIs	https://doi.org/10.1007/s10832-006-9875-3
Publication status	Published - Jul 2006
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Mechanics of Materials
Electrical and Electronic Engineering
Materials Chemistry

Keywords

BST
Microstructure
Sol-gel

Access to Document

10.1007/s10832-006-9875-3

Cite this

@article{1b6f2a8581454a76934a2b835e8c6d2d,

title = "Effect of excess TiO2 on the phase evolution and densification of sol-gel derived (Ba,Sr)TiO3 powders",

abstract = "Nanoscaled (Ba2/3Sr1/3)Ti1 + x O 3 powders have been prepared by sol-gel technique. Their phase evolution and densification behaviors have been studied by differential thermal analysis (DTA) and high temperature dilatometer, respectively. It is found the addition of 2 mol\%-excess amount of TiO2 lowers the activation energy required for the formation of the perovskite phase by about 130 kJ/mol and thus lowers the crystallization temperature of BST powders. However, the excess amount of TiO2 makes the nano-powder difficult to sinter. Transmission electron microscopy reveals that a metastable nano-porous layer has formed on the surface of TiO2-excess nanopowder and this may account for the slow densification rate.",

keywords = "BST, Microstructure, Sol-gel",

author = "Haitao Huang and Wei Qiu and Tan, \{Ooi Kiang\} and Weiguang Zhu and Zhou, \{Li Min\}",

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language = "English",

volume = "16",

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journal = "Journal of Electroceramics",

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TY - JOUR

T1 - Effect of excess TiO2 on the phase evolution and densification of sol-gel derived (Ba,Sr)TiO3 powders

AU - Huang, Haitao

AU - Qiu, Wei

AU - Tan, Ooi Kiang

AU - Zhu, Weiguang

AU - Zhou, Li Min

PY - 2006/7

Y1 - 2006/7

N2 - Nanoscaled (Ba2/3Sr1/3)Ti1 + x O 3 powders have been prepared by sol-gel technique. Their phase evolution and densification behaviors have been studied by differential thermal analysis (DTA) and high temperature dilatometer, respectively. It is found the addition of 2 mol%-excess amount of TiO2 lowers the activation energy required for the formation of the perovskite phase by about 130 kJ/mol and thus lowers the crystallization temperature of BST powders. However, the excess amount of TiO2 makes the nano-powder difficult to sinter. Transmission electron microscopy reveals that a metastable nano-porous layer has formed on the surface of TiO2-excess nanopowder and this may account for the slow densification rate.

AB - Nanoscaled (Ba2/3Sr1/3)Ti1 + x O 3 powders have been prepared by sol-gel technique. Their phase evolution and densification behaviors have been studied by differential thermal analysis (DTA) and high temperature dilatometer, respectively. It is found the addition of 2 mol%-excess amount of TiO2 lowers the activation energy required for the formation of the perovskite phase by about 130 kJ/mol and thus lowers the crystallization temperature of BST powders. However, the excess amount of TiO2 makes the nano-powder difficult to sinter. Transmission electron microscopy reveals that a metastable nano-porous layer has formed on the surface of TiO2-excess nanopowder and this may account for the slow densification rate.

KW - BST

KW - Microstructure

KW - Sol-gel

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