Mechanism of structural transformation in bismuth titanate

Sudhanshu Mallick; Bowman, Keith J.; King, Alexander H.
May 2005
Applied Physics Letters;5/2/2005, Vol. 86 Issue 18, p182902
Academic Journal
Sodium-doped bismuth titanate undergoes a transformation from Bi4Ti3O12 to Na0.5Bi4.5Ti4O15 on heating in air at temperatures exceeding 800 °C. This transformation proceeds through the intermediate Na0.5Bi8.5Ti7O27 structure which is an intergrowth phase of the two. High-resolution transmission electron microscopy was used to study this transformation. From the Moiré pattern that was obtained, the crystallographic orientation of the transformation front has been determined and a mechanism is proposed for this structural transformation.


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