Judicious layering of ferroelectrics leads to achieving enhanced dielectric response over a wide temperature range.
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Fu-Chang’s research concentrates on modeling ferroelectric polymers. Recent results published in Journal of Materials Chemistry C
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Tulsi, Yomery, Tumerkan and Fu-Chang at the 2015 IMS Affiliates Annual Meeting
Our group was very active at the at the 2015 IMS Affiliates Annual Meeting held on May 27 at UConn. Tulsi, Yomery, Tumerkan and Fu-Chang presented 4 posters.
Tumerkan: Characterization of Ag/W Circuit Breaker Contacts After Dry, Humid, and Natural Aging, M. Tumerkan Kesim, Haibo Yu, Yu Sun, Jason Harmon, Jonathan Potter, Mark Aindow, S. Pamir Alpay
Tulsi: Additive Manufacturing, T. Patel, V. Sharma, G. Agarwal, E. Curry, S. Pamir Alpay, A. Dongare, J. Hancock, R. Hebert
Yomery: Pyroelectric and Dielectric Properties of Ferroelectric Films With Interposed Dielectric Buffer Layers, Y. Espinal, M. T. Kesim, I. B. Misirlioglu, S. Trolier-McKinstry, J. V. Mantese, and S. Pamir Alpay
Fu-Chang: Temperature dependent structural, elastic, and polar properties of ferroelectric polyvinylidene fluoride (PVDF) and trifluoroethylene (TrFE) copolymers, Fu-Chang Sun, Avinash M. Dongare, Alexandru D. Asandei, S. Pamir Alpay, Serge Nakhmanson
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.
Tumerkan and Dr. Misirlioglu show that higher pyroelectric properties can be achieved in layer-by-layer engineered ferroelectric superlattices.
Results of the theoretical study carried out in collaboration with alumnus Dr. Misirlioglu at Sabanci University published in Applied Physics Letters.
I. B. Misirlioglu, M. T. Kesim, and S. P. Alpay, “Layer Thickness and Period as Design Parameters to Tailor Pyroelectric Properties in Ferroelectric Superlattices,” Appl. Phys. Lett. 105, 172905 (2014).
Two presentations at MS&T 2014
“Optimization of Piezoelectric Properties of Perovskite Oxides through Strain Engineering,” H. Khassaf, F. Sun, S. P. Alpay, Symposium on Advances in Dielectric Materials and Electronic Devices, Materials Science & Technology 2014, Pittsburgh, PA(Oct. 2014).
“Enhanced Electrocaloric and Pyroelectric Response from Ferroelectric Multilayers,” M .T. Kesim, J. Zhang, L. W. Martin, S. P. Alpay, Symposium on Multifunctional Oxides, Materials Science & Technology 2014, Pittsburgh, PA (Oct. 2014).
Four invited talks by Yomery, Tumerkan, Fu-Chang, and Reza at the IMRC in Cancun, Mexico
Our group was very busy at the XXIII International Materials Research Congress last week. Yomery, Tumerkan, Fu-Chang, and Reza and collaborators presented four invited talks in the Symposium on Interfaces, Structure, and Domains in Ferroic and Multiferroic Material Systems.
“Tailoring the Dielectric Properties of Ferroelectric-Dielectric Multilayers,” M. T. Kesim, J. Zhang, M. W. Cole, and S. P Alpay
“Dielectric and Pyroelectric Properties of PZT with Buffer Layers,” M. T. Kesim, Y. Espinal, S. Trolier-McKinstry, J. V. Mantese, and S. P. Alpa
“Composition and Microstructure Effects on Voltage Induced Piezoelectricity for BaxSr(1-x)TiO3 Thin Films,” N. M. Sbrockey, T. Kalkur, E. Nowe, H. Khassaf, S. P. Alpay, G. S. Tompa
“Strain Engineering of Piezoelectric Properties of Strontium Titanate and Barium Strontium Titanate”, F. Sun, N. Khakpash, H. Khassaf, N. M. Sbrockey, G. S. Tompa, T. S. Kalkur, and S. P. Alpay
Tumerkan and Jialan show that ferroelectric multilayers may have better electro-thermal properties
Their theoretical study in collaboration with Dr. Lane Martin (Univ. Illinois and UC, Berkeley) was published in Applied Physics Letters. Read more…
Fu-Chang and Reza publish in JMS
Strain engineering of piezoelectric properties of strontium titanate thin films