PZT\u2013NZF/CF ferrite flexible thick films: Structural, dielectric, ferroelectric, and magnetic characterization

J D Bobić,G Ferreira Teixeira,B D Stojanovic,M Ap Zaghete,M M Vijatović Petrović,S Gyergyek,R Grigalaitis

doi:10.1007/s40145-019-0337-1

Abstract

The preparation and properties of thick flexible three-phase composite films based on lead zirconium titanate (PZT) and various ferrites (nickel zinc ferrite (NZF) and cobalt ferrite (CF)) were reported in this study. Properties of three-phase composite films were compared with pure polyvinylidene fluoride (PVDF) and PZT–PVDF films. X-ray diffraction data indicated the formation of well crystallized structure of PZT and NZF/CF phases, without the presence of undesirable phases. Scanning electron micrographs showed that the ceramic particles were dispersed homogeneously in the PVDF matrix and atomic force microscopy confirmed that the size of the particles is around 30 nm. Non-saturated hysteresis loops were evident in all samples due to the presence of highly conductive ferrite phases. Under magnetic field of 10 kOe, composite films exhibited a typical ferromagnetic response. Dielectric properties were investigated in the temperature range from −128 to 250 °C and frequency range of 400 Hz–1 MHz. The results showed that the value of dielectric constant of the PVDF/PZT/ferrite composites increased about 25% above the one obtained for pure PVDF.

Highlights

A considerable attention has recently been focused on the development of technology for the growth of thick or thin films due to miniaturization requirements of electronic devices [1,2,3,4]
There is no evident existence of any secondary phases or formation of intermediate phase during synthesis of composite films
In the comparison with X-ray analysis of composite ceramics in which diffraction peaks of all phases were sharp, XRD patterns of polyvinylidene fluoride (PVDF)–PZT–ferrite samples showed the existence of broader peaks as a consequence of the presence of amorphous PVDF phase in the film

Summary

Introduction

A considerable attention has recently been focused on the development of technology for the growth of thick or thin films due to miniaturization requirements of electronic devices [1,2,3,4]. J Adv Ceram 2019, 8(4): 545–554 way to obtain composite thick films with different filler contents is a gravitational casting method. Pascariu et al [10] employed this method in order to obtain flat composites with compositional gradient along the thickness direction and in-plane homogeneous composition. They found that compositional gradients can be controlled to some extent by changing the filler properties, the matrix density, and the casting parameters. Literature data have shown that this approach is very effective in manufacturing 2-2 composite structures [15]

Methods

Results

Conclusion