Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24014
Title: Effect of excess TiO2 on the phase evolution and densification of sol-gel derived (Ba,Sr)TiO3 powders
Authors: Huang, H 
Qiu, W
Tan, OK
Zhu, W
Zhou, LM 
Keywords: BST
Microstructure
Sol-gel
Issue Date: 2006
Publisher: Springer
Source: Journal of electroceramics, 2006, v. 16, no. 4, p. 337-341 How to cite?
Journal: Journal of electroceramics 
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.
URI: http://hdl.handle.net/10397/24014
ISSN: 1385-3449
EISSN: 1573-8663
DOI: 10.1007/s10832-006-9875-3
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