Filters
cris logo
-
New search Filters
Select from list
Displayed from Show more
You have reached the maximum number of displayed search results.
All results displayed
No results are available for the search performed
Displayed from
You have reached the maximum number of displayed search results.
All results displayed
Loading results
Obtaining statistical data

Projects / Programmes source: ARIS

Dielectric Study of Relaxor Ferroelectric P(VDF-TrFE) Copolymer System

Edit
Research activity

Code Science Field Subfield
1.02.01  Natural sciences and mathematics  Physics  Physics of condesed matter 

Code Science Field
P190  Natural sciences and mathematics  Mathematical and general theoretical physics, classical mechanics, quantum mechanics, relativity, gravitation, statistical physics, thermodynamics 
P250  Natural sciences and mathematics  Condensed matter: structure, thermal and mechanical properties, crystallography, phase equilibria 
P260  Natural sciences and mathematics  Condensed matter: electronic structure, electrical, magnetic and optical properties, supraconductors, magnetic resonance, relaxation, spectroscopy 
Keywords
dielectric spectroscopy, copolymer, P(VDF-TrFE), relaxor, ferroelectric
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (1)
no. Code Name and surname Research area Role Period No. of publications
1.  15644  PhD Vid Bobnar  Physics  Head  2002 - 2004  0 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  18 
Abstract
Dielectric spectroscopy represents one of the basic experimental methods for studying the static and dynamic properties of relaxor systems, which have, due to their high values of dielectric and piezoelectric constant in a large temperature range, already found their utilization in many applications. Basic physical properties of relaxors also attract great interest, since it is believed that these systems provide a conceptual link between ferroelectrics and dipolar glasses.Recently, a giant electrostricitive response of the P(VDF-TrFE) copolymer, after its irradiation with high-energy electrons, has been observed, which makes it a very promissing material for applications such as sensors and actuators. After irradiation, copolymer exhibits typical relaxor behavior, suggesting that high-energy electrons break up all-trans chains in normal ferroelectric P(VDF-TrFE), which shows only low electrostricitive response, into nanopolar regions. An ultrahigh electrostrictive response therefore seems to be generated due to the large difference in lattice strain between the polar and nanopolar phases, however, intensive dielectric studies are necessary for a deeper understanding of its origin.The frequency and temperature dependence of the linear and nonlinear dielectric constant in copolymer P(VDF-TrFE), irradiated with high-energy electrons, will be studied. Results will show whether the same freezing process of the dielectric dynamics as in other relaxors occurs, and on their basis the microscopic origins for such high electrostrictive response will be deduced. Phase diagram with regard to the composition of both forming polymers, VDF and TrFE, will be constructed. Also, copolymers being irradiated with electrons of different energies will be investigated, in order to find out which copolymer is most useful for a specific application.In addition, dielectric studies of the P(VDF-TrFE) copolymer, irradiated with high-energy electrons, are also very interesting for the basic research, since this is the first known organic material showing a dispersion in the dielectric constant.
Confirmation required
Views history
Favourite