Ferroelectric and piezoelectric properties of cold pressed polyvinyledene fluoride/barium titanate nano-composites

Abstract

The ferroelectric and piezoelectric behaviour of a composite polymer ferroelectric (PF) based on ferroelectric polymer [polyvinyledene fluoride (PVDF)] and nano barium titanate (n-BaTiO₃) with different volume fractions of n-BaTiO₃ (f_BaTiO3), prepared through the novel cold pressing method, is investigated. The ferroelectric parameters increase up to f_BaTiO3 = 0.30, attributed to spherulites of PVDF, the increase of n-BaTiO₃ and the ordered structure due to cold pressing. The clustering of n-BaTiO₃ is responsible for randomisation of the structures of PF above 0.30, leading to a decrease in electrical polarisations, while dielectric properties increase linearly due to the increase of interfaces and piezoelectricity remains constant beyond 0.20.

Keywords:

• Spherulites
• ferroelectric polymers
• barium titanate
• hysteresis loss
• ferroelectricity
• piezoelectricity

Acknowledgments

The authors would like to thank Dr. Banarji Behera, Sambalpur University, Odisha, for providing the ferroelectric and piezoelectric data of the samples.