Investigating the physical and electrical of Non-Lead piezoelectric ceramics (Na,K)NbO3-Bi0.5(Na,K)0.5TiO3 by doping

• Main Authors: Wei-Zhi Chen, 陳威志
• Other Authors: Chun-Huy Wang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/04770290110680598313

碩士 === 南榮科技大學 === 工程科技研究所碩士班 === 102 === The main function of a piezoelectric material can make special materials convert mechanical energy to electrical energy with each other, B.Jaffe et al. U.S. National Bureau of Standards published its lead zirconate titanate (PZT) piezoelectric ceramic series, but the composition of materials containing lead points, resulting in the manufacturing process of lead pollution on the environment, in order to avoid this harm to human problems, is not lead-free piezoelectric ceramics future research priorities. This paper presents the system lead-free piezoelectric ceramics 0.97(Na0.5K0.5) NbO3-0.03Bi0.5(Na0.7K0.3)0.5TiO3 as the main doping 1 ~ 5wt% Li2CO3, Nb2O5, Mn2O3 to measure ceramic piezoelectric and dielectric properties changes to explore piezoelectric and dielectric properties of lead-free piezoelectric ceramics. This was found by the XRD patterns found by this Bi0.5 (Na0.75K0.25) 0.5TiO3 ceramic systems orthorhombic and tetragonal phases coexist in the systematic study of the composition of the doped ceramic material does not affect the crystal structure. For Bi0.5 (Na0.75K0.25) 0.5TiO3 ceramics no doping, kt value of about 0.41 kp value of about 0.27 a dielectric constant of about 1047 the piezoelectric constant d33 about 180pV / m. Doping 3wt.% Li2CO3 kt value of about 0.2 kp value of about 0.14 the dielectric constant of about 655 the piezoelectric constant d33 about 160pV / m. Doping 2wt% Nb2O5 kt value increased to 0.51, kp value of about 0.41, the dielectric constant of about 898 the piezoelectric constant d33 about 187pV / m. Doping 3wt% Mn2O3 kt value increased to 0.57 kp value of about 0.35 and the dielectric constant of about 1165 the piezoelectric constant d33 of about 189 pV / m. Keywords: lithium niobate, potassium sodium bismuth titanate, sintering, dielectric, properties, piezoelectric properties, polarization.