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- Title
Polarization Mechanisms in P(VDF‐TrFE) Ferroelectric Thin Films (Phys. Status Solidi RRL 10/2018).
- Authors
Choi, Andrew C.; Pramanick, Abhijit; Misture, Scott T.; Paterson, Alisa R.; Jones, Jacob L.; Borkiewicz, Olaf C.; Ren, Yang
- Abstract
Ferroelectric polymers have gained tremendous attention in recent years due to several attractive properties including high breakdown strength, low dielectric loss, relatively fast charge/discharge rates and greater flexibility than their ceramic counterparts. However, knowledge of the microscopic mechanisms of polarization under applied electric fields remained unsatisfactory due to a lack of direct experimental insights. Pramanick et al. (article no. 1800340) used in situ synchrotron X‐ray scattering experiment with 2D detection to identify the electric‐field‐induced polarization mechanisms in a P(VDF‐TrFE) ferroelectric thin film. They show, in contrast to conventional viewpoint, that the susceptibility for electricfield‐induced structural changes is larger in the defective ferroelectric phase γ than in the polar β phase. In addition, the polymer chains in the γ phase respond differently depending on their orientations with respect to the electric field direction. These results are broadly significant as they provide a fundamental basis for rational design of phase assemblages to obtain tailor‐made properties in ferroelectric polymer films. In particular, it is shown convincingly for the first time that the promotion of large crystallites and γ phase content through thermal annealing in vacuum provides a cost‐effective way to obtain a quasi‐linear polarization response in ferroelectric polymers.
- Subjects
FERROELECTRIC polymers; POLYVINYLIDENE fluoride; X-ray scattering; LINEAR polarization; FERROELECTRIC thin films
- Publication
Physica Status Solidi - Rapid Research Letters, 2018, Vol 12, Issue 10, pN.PAG
- ISSN
1862-6254
- Publication type
Article
- DOI
10.1002/pssr.201870331