Low-Temperature Sintering of LiBiO2-Coated Pb(Mg1/3Nb2/3)O3-PbZrO3-PbTiO3 Powders Prepared by Surface Chemical Modification Method and Their Piezoelectric Properties

概要

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Low-temperature sintering of LiBiO2-coated 0.375Pb(Mg1/3Nb2/3)O3-0.25PbZrO3-0.375PbTiO3 (PMN-PZT) powders was investigated with surface modification through the hydrolysis of lithium ethoxide and bismuth tri-t-amiloxide on the surface of PMN-PZT powders, and their microstructure and piezoelectric properties were examined. By using the surface chemical modification method, PMN-PZT powders were homogeneously coated with LiBiO2 precursor fine particles of 20–30 nm. PMN-PZT bodies sintered at temperatures from 800 to 1000°C with a chemically added LiBiO2 sintering aid exhibited more homogeneous microstructures and improved piezoelectric properties than the specimens fabricated with LiBiO2 added by a conventional mixing method. 0.75 wt% LiBiO2-added PMN-PZT ceramics fabricated at 950°C for 4 h showed a high density of approximately 7.7 g/cm3, and their electromechanical coupling factor ($k_{\text{p}}$) and piezoelectric coefficient ($d_{33}$) were 61.8% and ${\sim}517$ pm/V, respectively. And also, a large field-induced strain of ${\sim}0.17$% and a well-saturated hysteresis loop with a remanent polarization ($P_{\text{r}}$) of 33.9 μC/cm2 were observed under an applied electric field of $\pm 40$ kV/cm.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-09-15