In this study,piezoelectric materials 0.95 (Na0.5Bi05)TiO3-0.05 BaTiO3 (NBT-BT) composition with excess x wt% Bi2O3 (x=0,1,2,and 3) are investigated as a function of sintering temperatures.The sintering characteristics and dielectric characteristics of excess Bi2O3-doped 0.95 (Na0.5Bi0.5)TiO3-0.05 BaTiO3 ceramics are developed with the aid of SEM,XRD patterns,and dielectric-temperature curves.The sintering process is carried out in air for 2h from 1120℃ to 1200℃.Dielectric-temperature properties are investigated in the temperature range of 30℃~350℃ at the frequencies of 10KHz~1MHz.The maximum dielectric constants of NBT-BT ceramics first increase with the increase of Bi2O3 content,reach the maximum at 1wt%-Bi2O3-added NBT-BT ceramics,and then decrease with the further increase of Bi2O3 content.The maximum dielectric constants of NBT-BT ceramics are almost unchanged as the measured frequency increases.The Curie temperatures of NBT-BT ceramics are also developed.
Yin-Fang Wei Chia-Hsiung Kao Cheng-Fu Yang Ho-Hua Chung Hong-Hsin Huang Yao-Sheng Yang
Department of Electrical Engineering,National Sun Yat-Sen University,Kaohsiung,Taiwan Department of Chemical and Materials Engineering,National University of Kaohsiung,Kaohsiung,Taiwan Department of Mechanical and Automation Engineering,Kao Yuan University,Kaohsiung,Taiwan Department of Electrical Engineering,Cheng-Shiu University,Kaohsiung,Taiwan Department of Electronic Engineering,Kao Yuan University,Kaohsiung,Taiwan