Dielectric properties of PZT ceramics with various ZT contents

Chompoonuch Puchmark

Abstract


In this research, Pb(ZrxTi1-x)O3 ceramics varied molar ratio of Zr/Ti were 10/90, 30/70, 50/50, 70/30 and 90/10. These powders were prepared by the conventional mixed oxide method and calcined at 800 oC for 2h with heating rate 5 oC/min. The calcined powders were pressed into a disc shape and sintered at 1250 oC for 2 h with heating rate of 5 ◦C/min. The microstructural of the varied ceramics was examined by scanning electron microscopy (SEM) and calculated grains size. Density of the sintered samples was measured by Archimedes method with distilled water as the fluid medium. The effects of ZT ratio on dielectric constant and dielectric loss of Pb(ZrxTi1-x)O3 ceramics were investigated using LCR meter at 1, 10, 100, 500 kHz and 1 MHz. It was found that, the value of density is in range of 6.67 – 7.72 g/cm3 and the Pb(Zr0.5Ti0.5)O3 ceramic was the highest density. The microstructure indicates that the increased ZT ratio in Pb(ZrxTi1-x)O3 ceramics could be significantly reduce the mean grain size from 4.3 to 1.3 m. The optimum of ZT molar ratio was found in 50/50. The highest dielectric constant and the lowest loss of dielectric of Pb(Zr0.5Ti0.5)O3 ceramic with all of measurement frequencies and corresponding of the highest densification ceramic.

Keywords: PZT ceramics, dielectric properties, calcinations, sintering


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