Fabrication of ferroelectric lead iron tungstate ceramics via a two-stage solid-state reaction
Resource
Ceramics International 21 (6): 413-419
Journal
Ceramics International
Journal Volume
21
Journal Issue
6
Pages
413-419
Date Issued
1995
Date
1995
Author(s)
Wong, Yeak-Chong
Abstract
Ferroelectric Pb(Fe 2 3W 1 3)O3 was synthesized via a new two-stage solid-state reaction discussed in the present study. This method utilized Fe2WO6 prepared at the first-stage which subsequently reacted with a stoichiometric amount of PbO at the second stage. This process efficiently suppressed the formation of lead tungstates and liquid phases; in addition, pyrochlore phase was formed as the only intermediate compound. A substantial amount of pyrochlore phase was converted to Pb(Fe 2 3W 1 3)O3 at around 710 °C associated with an endothermic reaction. On heating up to 750 °C over 99% perovskite Pb(Fe 2 3W 1 3)O3 was formed, and this formation became complete at 840 °C. Compared with the conventional solid-state reaction, this process not only simplified the formation process, but also reduced the formation temperature of Pb(Fe 2 3W 1 3)O3. The crystal structure of Fe2WO6 did not significantly influence the formation mechanism; whereas, the morphology of Pb(Fe 2 3W 1 3)O3 was markedly affected by the grain size of Fe2WO6. By using this process, pure Pb(Fe 2 3W 1 3)O3 with a submicron microstructure was successfully fabricated. © 1995.
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
02.pdf
Size
798.81 KB
Format
Adobe PDF
Checksum
(MD5):cf6e14e098fb803aa742fff35b006c47