Tulsi Patel and Reza Khassaf, working with Prof. Aindow and Prof. Nazanin Bassiri-Gharb, deposit PZT on additively manufactured Inconel. Alumnus Dr. Misirlioglu explains the origin of the low dielectric loss in graded ferroelectrics.
Author: Rhonda Ward
Electrocaloric Properties of Relaxor Ferroelectrics
Reza’s work with collaborators from United Technologies Research Center, Georgia Tech and Jozef Stefan Institute (Slovenia) shows that intrinsic adiabatic temperature changes in relaxor-FEs are substantial and relatively temperature insensitive. Our findings were recently published in Journal of Materials Chemistry C.
Acoustic Detection and Modeling of Phase Transitions at the Nanoscale
Our colleagues at Georgia Tech and Oak Ridge demonstrate acoustic detection in nanoscale volumes by the use of an atomic force microscope. Elastic changes in volume are measured by detecting changes in resonance of the cantilever. Reza has provided theoretical guidance, modeling the electric field driven phase transformation using Landau theory.
Reza’s work on multilayer ferroelectrics published in Acta Mater
Reza’s experimental work, in collaboration with Prof. Aindow’s group, shows that there is a dielectric anomaly in fairly thick ferroelectric-eparaelectric bilayers. Read more…
Getting together at the end of 2015
The group had a great lunch at Geno’s Grille to celebrate the Holidays. Research talk was strictly forbidden. We are looking forward to another great year!
Two publications in the Journal of Materials Science 50th Anniversary Special Issue
The group published two papers in the upcoming 50th Anniversary Special Issue of JMS. Both publications deal with uniques properties of ferroelectric multilayers. Misirlioglu et al. provide theoretical proof that ferroelectric/paraelectric multilayers could potentially be used as low-voltage gate materials. Yomery, Fu-Chang, and Tumerkan show that ferroelectric heterostructures cannot be considered as simple capacitors in series.
Read more here…
Fu-Chang and collaborators from VA Tech publish in Scientific Reports – Nature
Judicious layering of ferroelectrics leads to achieving enhanced dielectric response over a wide temperature range.
Read more here…
Fu-Chang’s research concentrates on modeling ferroelectric polymers. Recent results published in Journal of Materials Chemistry C
Read more…
Reza and Nasser develop misfit strain phase diagrams of relaxor ferroelectric PMN-PT
Their results that were published in Appl. Phys. Lett. show that it is possible to stabilize an adaptive monoclinic phase over a wide range of misfit strains. Link to the paper.
Yomery, Tumerkan and Burc’s study on ferroelectric films dielectric buffer layers published in Applied Physics Letters
Yomery, Tumerkan and alumnus Dr. Misirlioglu (Sabanci Univ) computed the dielectric and pyroelectric properties of ferroelectric films with linear dielectric buffer layers. The calculations show that the dielectric and pyroelectric properties of such multilayers can be increased by the presence of the buffer compared to ferroelectric monolayers. The findings of this paper suggest that the performance of pyroelectric based energy conversion devices (thermal to electric and electric to thermal) could benefit from having interposed dielectric buffer layers between electrodes.