Effect of stabilization heating on the piezo-, di- and ferro (PDF) electric behavior of PMN PT ceramic in the MPB

International Conference and Expo on Ceramics

August 17-18, 2015 Chicago, USA

Pius Augustine and M S Ramachandra Rao

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

(1-x) [Pb(Mg1/3Nb2/3)O3] - x[PbTiO3] belongs to the category of relaxor ferroelectrics, is a suitable material for the piezoelectric
applications and exhibit composition dependant response to external stimulus. Wide range of dielectric constants, low dielectric loss
and high coupling make PMN–PT outstanding among relaxors. Synthesis of phase pure PMN-PT without pyrochlore is a challenge,
which is as much an art as it is science. We could achieve device quality stoichiometric PMN-PT ceramic through novel modulated
heating coupled with partial covering method. Samples prepared with and without excess PbO, showed nearly identical electrical
behavior. High temperature stabilization was administered to the samples in two different ways and was found to be successful in
realizing stoichiometric and device quality ceramic. Phase formation and electrical analysis attested the utility of the ceramic and
the method of preparation. The unusual PDF-electric behavior of the samples may be attributed to quality of grinding, stabilization
heating and big grains with limited grain boundary free of PbO inclusion. In my presentation, I will be giving a comparative study
of piezoelectric, dielectric and ferroelectric behavior of two sets of samples prepared by administering stabilization heating in two
different ways. XRD, Raman, XPS and SEM analysis of the composition will be outlined along with PDF-electric studies. PLD grown
thin films on bare and La0.5Sr0.5CoO3 (LSCO) deposited platinised silicon substrate and topographic studies using AFM will also be
presented. We are trying to develop large area PMN-PT thin films for under water sensor applications.

Biography :

Pius Augustine is a Research Scholar at the Department of Physics, IIT Madras. His research work is on ‘Ferroelectric and Piezoelectric thin film development
for device applications’. His research interests are relaxors in general and Pb(Mg1/3Nb2/3)O3-PbTiO3 in particular. Synthesis of pyrochlore frees PMN-PT through a
modulated heating in combination with a partial covering method.