新型无铅Bi0.5(Na0.40K0.10)TiO3-(Ba0.7Sr0.3)TiO3压电陶瓷的研究

Investigation of a new lead-free Bi0.5(Na0.40K0.10)TiO3-(Ba0.7Sr0.3)TiO3 piezoelectric ceramic.

作者信息

Jaita Pharatree, Watcharapasorn Anucha, Jiansirisomboon Sukanda

机构信息

Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand.

出版信息

Nanoscale Res Lett. 2012 Jan 5;7(1):24. doi: 10.1186/1556-276X-7-24.

DOI:10.1186/1556-276X-7-24

PMID:22221833

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3275540/

Abstract

Lead-free piezoelectric compositions of the (1-x)Bi0.5(Na0.40K0.10)TiO3-x(Ba0.7Sr0.3)TiO3 system (when x = 0, 0.05, 0.10, 0.15, and 0.20) were fabricated using a solid-state mixed oxide method and sintered between 1,050°C and 1,175°C for 2 h. The effect of (Ba0.7Sr0.3)TiO3 [BST] content on phase, microstructure, and electrical properties was investigated. The optimum sintering temperature was 1,125°C at which all compositions had densities of at least 98% of their theoretical values. X-ray diffraction patterns that showed tetragonality were increased with the increasing BST. Scanning electron micrographs showed a slight reduction of grain size when BST was added. The addition of BST was also found to improve the dielectric and piezoelectric properties of the BNKT ceramic. A large room-temperature dielectric constant, εr (1,609), and piezoelectric coefficient, d33 (214 pC/N), were obtained at an optimal composition of x = 0.10.

摘要

采用固态混合氧化物法制备了(1 - x)Bi0.5(Na0.40K0.10)TiO3 - x(Ba0.7Sr0.3)TiO3体系（x = 0、0.05、0.10、0.15和0.20）的无铅压电组合物，并在1050°C至1175°C之间烧结2小时。研究了(Ba0.7Sr0.3)TiO3 [BST]含量对相、微观结构和电学性能的影响。最佳烧结温度为1125°C，此时所有组合物的密度至少为其理论值的98%。随着BST含量的增加，显示四方性的X射线衍射图谱增加。扫描电子显微镜照片显示，添加BST时晶粒尺寸略有减小。还发现添加BST可改善BNKT陶瓷的介电和压电性能。在x = 0.10的最佳组成下，获得了较大的室温介电常数εr（1609）和压电系数d33（214 pC/N）。