The current research activities
of Varma's group encompass nanocrystallization
of various oxides belonging to Aurivillius family
of perovskite materials in compatible host glass
matrices and demonstrating their multifunctionalities.
The materials that were nanocrystallized in borate
based glass matrices include Bi2WO6, Bi2VO5.5,
SrBi2Nb2O9, SrBi2Ta2O9, BaTiO3, LiNbO3, K3Li2Nb5O15,
LiTaO3 etc. Nanocrystallization of various other
interesting borate materials in their own glass
matrices has been demonstrated.
The nanocrystals of the above
materials embedded in various glass matrices were
proved to be promising from their dielectric,
pyroelectric, ferroelectric, optical and non-linear
optical device based applications point of view.
The nanocrystals that were embedded in various
glass matrices were found to be interesting from
their Bragg optical diffraction based devices
point of view.
Functional polar ceramics:
Research work has been also centered
on the design, synthesis, fabrication and characterization
of novel compositions corresponding to the above
family of oxides. Towards this end a few new compounds
- K0.5La0.5Bi2Nb2O9 and K0.5La0.5Bi2Ta2O9 were
synthesized and demonstrated to be exhibiting