摘要压电陶瓷是一种重要的功能材料，在很多领域有着广泛的应用。现在使用的压电陶瓷材料主要是以含铅陶瓷为主，随着人们的环境保护意识和可持续发展观念的逐渐提高，无铅压电陶瓷成为一个主要的研究方向。钛酸铋钠(Na0.5Bi0.5TiO3系列压电材料作为一种新型的无铅压电材料引起人们越来越多的关注。本课题选择Na0.5Bi0.5TiO3为研究对象，通过溶胶-凝胶法成功制备了(1-x)Na0.5Bi0.5TiO3-xBa0.5TiO3压电陶瓷，研究了溶胶-凝胶法制备(1-x)Na0.5Bi0.5TiO3-xBa0.5TiO3压电陶瓷的工艺过程，并对陶瓷的结构和性能进行了研究。67482

XRD测试表明在x=0.06附近存在三方、四方相共存的晶体结构，称为准同型相界(MPB)；陶瓷样品的电学性能随着BaTiO3含量的增加而呈现先变大后减小的变化趋势，在其准同型相界处具有最佳电学性能：压电常数达到166.8pC/N。铁电性能测试表明，样品的漏电流较小，绝缘性好，能够测出较饱和的电滞回线。随着掺杂量的增多，矫顽场增大，剩余极化强度减小。

毕业论文关键词   压电陶瓷    溶胶-凝胶法    压电常数    电滞回线

毕业设计说明书（论文）外文摘要

Title  Preparation and Characterization Of BNT-BT Piezoelectric Ceramics

Abstract

Piezoelectric ceramics are very important functional materials,which have wide application in various fields.From the viewpoint of environmental consciousness and sustainable development,lead-free piezoelectric ceramics received more and more attention world-wide in recent years.Bismuth sodium titanate (Na0.5Bi0.5TiO3)is thought to be a promising lead-free ceramic.In this thesis,BNT-BT ceramics was successfully prepared by sol-gel method and the characterization of it was studied.

It was found that the morphotropic phase boundary(MPB)with rhombohedral and tetragonal co-exist crystalline structure for the ceramics lies in x=0.06 by XRD.The addition of BaTiO3 causes a promoted grain growth and densification.The piezoelectric constant d33 of the (1-x)Na0.5Bi0.5TiO3-xBa0.5TiO3 ceramics show an obvious improvement by a small amount of BaTiO3 substitution.Around the MPB composition, the sample exhibits optimal electrical properties(d33=166.8pC/N).Ferroelectric properties of the samples were measured,which revealed that the samples with small leakage current had the good insulation and the saturated P-E loop.With the addition increasing ,the coercive field  enhanced and the saturation polarization decreased.

Keywords  piezoelectric ceramics   sol-gel   d33   P-E loop

目录

摘要 2

1 绪论 2

1.1 引言 2

1.2 压电陶瓷概述 2

1.2.1 压电效应 2

1.2.2 压电陶瓷的主要性能参数 4

1.2.3 压电陶瓷的发展历史 5

1.2.4 压电陶瓷的应用 6

1.3 钛酸铋钠无铅压电陶瓷 6

1.3.1 钛酸铋钠陶瓷的结构和性能 6

1.3.2 Bi0.5Na0.5TiO3陶瓷研究现状 7

1.4 研究背景及研究内容 8

1.4.1 研究背景 8

1.4.2 研究内容 9

2 陶瓷的制备流程与性能测试方法 10

2.1 实验原料 10