Origin of dielectric relaxor behavior in PVDF-based copolymer and terpolymer films

Pramanick, Abhijit; Osti, Naresh C.; Jalarvo, Niina H.; Misture, S T.; Omar Diallo, Souleymane; Mamontov, Eugene; Luo, Yingdong; Keum, Jong K.; Littrell, Ken

doi:10.1063/1.5014992

Title: Origin of dielectric relaxor behavior in PVDF-based copolymer and terpolymer films

Journal Article · Wed Apr 04 00:00:00 EDT 2018 · AIP Advances

DOI:https://doi.org/10.1063/1.5014992· OSTI ID:1830155

Pramanick, Abhijit ^[1];

^[2];

^[3]; Misture, S T. ^[4];

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City Univ. of Hong Kong (Hong Kong)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Forschungszentrum Juelich (Germany)
Alfred Univ., NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Smiths Detection Inc., Edgewood, MD (United States)

Relaxor ferroelectrics exhibit frequency-dispersion of their dielectric permittivity peak as a function of temperature, the origin of which has been widely debated. Microscopic understanding of such behavior for polymeric ferroelectrics has presented new challenges since unlike traditional ceramic ferroelectrics, dielectric relaxation in polymers is a consequence of short-range molecular dynamics that are difficult to measure directly. Here, through careful analysis of atomic-level H-atom dynamics as determined by Quasi-elastic Neutron Scattering (QENS), we show that short-range molecular dynamics within crystalline domains cannot explain the macroscopic frequency-dispersion of dielectric properties observed in prototypical polyvinylidene-fluoride (PVDF)-based relaxor ferroelectrics. Instead, from multiscale quantitative microstructural characterization, a clear correlation between the amount of crystalline-amorphous interfaces and dielectric relaxation is observed, which indicates that such interfaces play a central role. These results provide critical insights into the role of atomic and microscopic structures towards relaxor behavior in ferroelectric polymers, which will be important for their future design.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1830155

Alternate ID(s):: OSTI ID: 1431385

Journal Information:: AIP Advances, Vol. 8, Issue 4; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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