Abstract:
:Ferroelectric materials exhibit a phase transition to a paraelectric state driven by temperature - called the Curie transition. In conventional ferroelectrics, the Curie transition is caused by a change in crystal symmetry, while the material itself remains a continuous three-dimensional solid crystal. However, ferroelectric polymers behave differently. Polymeric materials are typically of semi-crystalline nature, meaning that they are an intermixture of crystalline and amorphous regions. Here, we demonstrate that the semi-crystalline morphology of the ferroelectric copolymer of vinylidene fluoride and trifluoroethylene (P(VDF-TrFE)) strongly affects its Curie transition, as not only a change in crystal symmetry but also in morphology occurs. We demonstrate, by high-resolution nanomechanical measurements, that the semi-crystalline microstructure in the paraelectric state is formed by crystalline domains embedded into a softer amorphous phase. Using in situ X-ray diffraction measurements, we show that the local electromechanical response of the crystalline domains is counterbalanced by the amorphous phase, effectively masking its macroscopic effect. Our quantitative multi-scale characterisations unite the nano- and macroscopic material properties of the ferroelectric polymer P(VDF-TrFE) through its semi-crystalline nature.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Hafner J,Benaglia S,Richheimer F,Teuschel M,Maier FJ,Werner A,Wood S,Platz D,Schneider M,Hradil K,Castro FA,Garcia R,Schmid Udoi
10.1038/s41467-020-20407-6subject
Has Abstractpub_date
2021-01-08 00:00:00pages
152issue
1issn
2041-1723pii
10.1038/s41467-020-20407-6journal_volume
12pub_type
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