Background: Bismuth titanate (Bi4Ti3O12) is one of the prominent candidates in lead free
ferroelectric/piezoelectric materials and also in photocatalytic materials. Moreover, it is mainly utilized
in the piezotronic-smart material field. Bi4Ti3O12 demands more efforts to enhance its functional
properties by modifying its chemical as well as physical features. Currently, the new class of materials
is required to fulfill the necessity of multi-functionality with better performance. In this context, we
proposed a novel model material and fabricated it in a facile way.
Methods: In this report, we present a one-step route to synthesizing and studying of the smart material
xBi-Bi4-xTi3O12-y-Bi4Ti3O12 at real-time mode in High Resolution Transmission Electron Microscope
(HRTEM) at micro-scale level.
Results: Bi4Ti3O12 shows significant changes under e-beam, which is converted into Bi metal nanocrystals
decorated on the non-stoichiometric A-site deficient Bi4-xTi3O12-y microparticle. The surface
and electronic characteristics study demonstrates the presence of Bi and also divulges that there is a
modification in electronic band structures. The Fermi levels of the non-irradiated and irradiated
Bi4Ti3O12 were found to be 1.45 ± 0.1 eV and 1.8 ± 0.1 eV above the valence band maximum, respectively.
The chemical composition analysis of the resultant material shows signs of the existence of
Conclusion: A new class of multifunctional material like metal-n-type semiconductor / ferroelectric
(xBi-Bi4-xTi3O12-y-Bi4Ti3O12) is synthesized at a micro-scale level in HRTEM and investigated
systematically. The formation of the novel structure may follow the Knotek-Feibelmen mechanism involving
the Auger decay of oxygen and local bond-breaking phenomenon in Aurivillius phase double
layered perovskite Bi4Ti3O12.