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

Research output: Journal article publication › Journal article › Academic research › peer-review

5 Citations (Scopus)

Abstract

Nanoscaled (Ba2/3Sr1/3)Ti1 + xO3powders 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 TiO2lowers 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 TiO2makes 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 - 1 Jul 2006

Keywords

BST
Microstructure
Sol-gel

ASJC Scopus subject areas

Ceramics and Composites

More information

10.1007/s10832-006-9875-3

Cite this

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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 + xO3powders 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 TiO2lowers 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 TiO2makes 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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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 - 2006/7/1

Y1 - 2006/7/1

N2 - Nanoscaled (Ba2/3Sr1/3)Ti1 + xO3powders 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 TiO2lowers 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 TiO2makes 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 + xO3powders 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 TiO2lowers 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 TiO2makes 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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U2 - 10.1007/s10832-006-9875-3

DO - 10.1007/s10832-006-9875-3

M3 - Journal article

SN - 1385-3449

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SP - 337

EP - 341

JO - Journal of Electroceramics

JF - Journal of Electroceramics

IS - 4

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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