Effect of the matrix subsystem on hydrostatic parameters of a novel 1–3-type piezo-composite

Abstract

The influence of the aspect ratio and volume fraction of ferroelectric ceramic inclusions in a 0–3 matrix on the hydrostatic parameters of a three-component 1–3-type composite is studied to demonstrate the important role of the elastic properties of the two-component matrix on the composite performance. Differences in the elastic properties of the 0–3 matrix and single-crystal rods lead to a considerable dependence of the hydrostatic response of the composite on the anisotropy of the matrix elastic properties. The performance of a 1–0–3 0.92 Pb ( Zn 1/3 Nb 2/3) O 3–0.08 PbTiO 3 SC/modified PbTiO 3 ceramic/polyurethane composite suggests that this composite system is of interest for hydroacoustic applications due to its high hydrostatic piezoelectric coefficients [Formula: see text] and [Formula: see text], squared figure of merit [Formula: see text], and electromechanical coupling factor [Formula: see text].

1‐3‐Type Composites Based on Ferroelectrics: Electromechanical Coupling, Figures of Merit, and Piezotechnical Energy‐Harvesting Applications

“…As is known from previous work, modification of the polymer matrix surrounding the FE rods in the 1‐3‐type composite influences its squared figures of merit ( ) 2 from Equations (11) and anisotropy of ( ) 2 . These parameters are often used to characterize the sensor signal‐to‐noise ratio of a piezoelectric element and its sensitivity .…”

“…Our evaluations of the properties of the 0‐3 matrix suggest that it exhibits a low piezoelectric activity due to the presence of isolated FE ceramic inclusions at volume fractions 0< m i ≤0.3 and aspect ratios 0.01≤ ρ i ≤100. However, even in a case of an ideal poling level of this matrix, the absolute values of its piezoelectric coefficients are relatively low whereby | |<10 pC N −1 , i.e., two orders‐of‐magnitude less than | | of the PMN‐0.33PT SC. Hereafter we neglect the piezoelectric activity of the 0‐3 ceramic/polymer matrix in comparison to the piezoelectric activity of the SC rod and consider the ceramic inclusions in their unpoled state.…”

“…A large number of possibilities exist to modify the polymer matrix surrounding the FE rods in 1‐3‐type composite (see insets 3–5 in Figure ). This can lead to an improvement in composite performance including the piezoelectric anisotropy, sensitivity, squared figures of merit, electromechanical coupling factors, and hydrostatic parameters . In Section 3 we discuss examples of the 1‐3‐type composites based on FEs to show the important role of the matrix in forming the piezoelectric response and highlight methods for improving the effective parameters of the composites.…”

“…The highly unusual example of the hydrostatic piezoelectric response of the 1‐0‐3 composite was studied previously . This composite is similar to the 1‐3‐0 PMN‐0.33PT SC/modified PbTiO 3 ceramic/polyurethane composite, however instead of the PMN‐0.33PT SC, the PZN‐0.08PT SC is used.…”

“…A modification of the matrix and a formation of the composite structure therein (see insets 3–5 in Figure ) leads to changes in the effective properties of the composite that can be termed a “1‐3‐type composite”. These changes lead to improvement of specific parameters of the 1‐3‐type composite in comparison to its conventional 1‐3 equivalent.…”