Electrical behaviour of PMN–PT–PVDF nanocomposite

Abstract

Nanocomposites of polyvinyldene fluoride (PVDF) and a solid solution of lead magnesium niobate and lead titanate (0.65PMN–0.35PT) with varying composition ratios were prepared by the hot-press technique. The phase structure and morphology were studied by thermal analysis (DTA), x-ray diffraction and scanning electron microscopy. The PVDF sample showed an exothermic peak due to the crystallization of the PVDF phase, but with the addition of PMN–PT powders an extra peak appeared due to the crystallization of the pyrochlore phase present in the PMN–PT powder. The crystallite size of the prepared samples was found to be between 40 and 60 nm. The value of the relative permittivity increased with the increase in the ceramic concentration. The presence of a single semicircle confirmed the presence of the bulk effect only. The bulk conductivity indicated an Arrhenius type thermally activated process. The ac conductivity spectrum obeyed the Jonscher power law.

Influence of Ferroelectric Filler Size and Clustering on the Electrical Properties of (Ag–BaTiO3)–PVDF Sub-Percolative Hybrid Composites

“…This fact is also indicated by the local field histogram (Figure S1aSupporting Information) showing that the number of regions subjected to larger fields is higher for partially connected microstructures. Due to the observed saturation effect, these simulations clearly indicate the unfruitful approach to search for fillers with higher permittivity above 10 3 (like the proposed ferroelectric relaxors), ,− to further increase the effective permittivity in flexible composites. This limitation was not discussed in the literature nor evidenced in other works related to similar composites.…”

Evolution of poled state in P(VDF-TrFE)/(Pb,Ba)(Zr,Ti)O3 composites probed by temperature dependent Piezoresponse and Kelvin Probe Force Microscopy

“…They show ferroelectricity already in the as-grown state, which causes their good piezoelectric and pyroelectric properties 9 . Improvement of the piezoelectric, dielectric and elastic properties of P(VDF-TrFE) polymers has been achieved by mixing them with electroactive fillers, like triglycine sulphate crystals 8 , lead zirconate titanate 1,7,13 , barium titanate 14 ceramics, as well as some relaxor ferroelectrics 15,16 .…”

Experimental studies for stability of ferroelectric phase in potassium nitrate composite films

“…These composites show improvement towards higher operating temperature. The flexible composites were fabricated in thin film form (200–400 μm) by hot‐pressing [12]. Thin film sensors of ceramic/polymer composite with mixed connectivities possess high values of piezo and pyroelectric coefficients and the formability and flexibility which are not attainable in single‐phase ferroelectric materials [2, 12, 13].…”

“…The composite with low acoustic impedance matching to water and tissue can be produced. These composites can be useful in biomedical and under water transducer applications [2–14].…”

“…1. Many researchers [5–21] have been deeply engrossed to obtain the stability of ferroelectric phase III in KNO 3 at room temperature. The ferroelectric phase III of KNO 3 can be used in large potential applications in the area of switching devices and memory cells, and ferroelectric characteristics.…”