Effect of composition and grain size on dielectric, ferroelectric and induced strain behavior of PLZT/ZrO2 composites

Funsueb, Narit; Ngamjarurojana, Athipong; Tunkasiri, Tawee; Limpichaipanit, Apichart

doi:10.1016/j.ceramint.2018.01.025

Cited by 15 publications

(1 citation statement)

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“…Up to the present time, the highest magnetoelectric coefficients have been achieved by combining a ferroelectric phase with high piezoelectric response and a ferromagnetic phase with large magnetostriction through strain mediation. Among ferroelectric phases, pure or doped PbZr x Ti 1-x O 3 (PZT) perovskite compounds close to the morphotropic phase boundary (MPB) are frequently employed due to their very high dielectric constant and electromechanical coupling [26][27][28][29][30][31][32][33]. As to the magnetostrictive phase, CoFe 2 O 4 (cobalt ferrite, CF) spinel oxide is a very interesting component although its large magneto-crystalline anisotropy limits its magnetic field sensitivity, that is, the slope of the magnetostriction curve vs. applied magnetic field [34,35].…”

Section: Introductionmentioning

confidence: 99%

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

et al. 2020

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In this work, we investigated the processing-microstructure-property relationships for magnetoelectric (ME) particulate composites consisting of hard ferromagnetic CoFe2O4 (CFO) particles dispersed in a Nb-doped PbZrxTi1-xO3 (PZT) soft ferroelectric matrix. Several preparation steps, namely PZT powder calcination, PZT-CFO mixture milling and composite sintering were tailored and a range of microstructures was obtained. These included open and closed porosities up to full densification, PZT matrices with decreasing grain size across the submicron range down to the nanoscale and well dispersed CFO particles with bimodal size distributions consisting of submicron and micron sized components with varying weights. All samples could be poled under a fixed DC electric field of 4 kV/mm and the dielectric, piezoelectric and elastic coefficients were obtained and are discussed in relation to the microstructure. Remarkably, materials with nanostructured PZT matrices and open porosity showed piezoelectric charge coefficients comparable with fully dense composites with coarsened microstructure and larger voltage coefficients. Besides, the piezoelectric response of dense materials increased with the size of the CFO particles. This suggests a role of the conductive magnetic inclusions in promoting poling. Magnetoelectric coefficients were obtained and are discussed in relation to densification, piezoelectric matrix microstructure and particle size of the magnetic component. The largest magnetoelectric coefficient α33 of 1.37 mV cm−1 Oe−1 was obtained for submicron sized CFO particles, when closed porosity was reached, even if PZT grain size remained in the nanoscale.

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