Influence of the presence of titanium oxide on the formation of pyrochlore phase in ferroelectric strontium bismuth tantalate ceramics
Journal
Ferroelectrics, Letters Section
Journal Volume
26
Journal Issue
1
Pages
41-51
Date Issued
1999
Author(s)
Abstract
The effects of addition of TiO2 on the formation of pyrochlore phase and dielectric properties of ferroelectric SrBi2Ta2O9 have been investigated. When the content of TiO2 is less than 10 mol%, no secondary phases are produced, and SrBi2Ta2O9-TiO2 solid solutions are formed. However, with TiO2 content ?20 mol%, a pyrochlore phase is produced. Raising the content of TiO2 in starting materials significantly increases the amounts of pyrochlore phase, and reduces the initial temperature for the formation of pyrochlore phase. The existence of TiO2 also decreases the thermal stability of SrBi2Ta2O9, causing the decomposition of SrBi2Ta2O9 to take place at lower temperatures. Furthermore, the presence of TiO2 reduces the dielectric constants as well as remnant polarization of formed ceramics.
Type
journal article