期刊
FERROELECTRICS
卷 510, 期 1, 页码 132-151出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00150193.2017.1328249
关键词
Pyroelectricity; ferroelectricity; phase transition; copolymer; vinylidene fluoride; trifluoroethylene; X-ray diffraction; flexoelectricity; differential scanning calorimetry
资金
- Federal Ministry of Education and Research (BMBF)
- European Union (European Regional Development Fund) [100109976]
- Ministry of Science and Art of Saxony (SMWK)
- Sachsische Aufbaubank (SAB) [100245339]
- HGF [VH-VI-422]
- joint research project CryPhysConcept - Mit Kristallphysik zum Zukunftskonzept elektrochemischer Energiespeicher [03EK3029A]
The ferroelectric phase transition of copolymers of vinylidene fluoride (VDF) with trifluoroethylene (TrFE) is well known and related to conformational changes in the polymer chain. Contrary to the expected paraelectric behaviour in the high temperature phase a pyroelectric investigation of the phase transition in the range from 0 degrees C to 130 degrees C combined with X-ray diffraction indicate the copolymer as ferroelectric when prepared and polarised in the high-temperature phase. Based on this finding the orthorhombic space-group Fmm2 is proposed for the polar high-temperature phase. Above the Curie temperature the material exhibits pyroelectricity with inverted sign, whose origin is interpreted as flexoelectricity.
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