摘要压电材料因为其压电性能在传感器及换能器等领域被广泛应用，而钛酸铋钠Bi0。5 Na0。5TiO3(BNT)基压电材料由于其优良的压电性能、较高的剩余极化强度、较高的居里温度、较强铁电性、介电常数较小等优点被认为最可能替代铅基材料，以减少铅基材料对环境和人体的危害。然而BNT基陶瓷有较高的矫顽场，以致极化困难，并且很难烧结致密，对其压电性能有很大影响。本论文选取Bi0。5 Na（1-x）TiO3-Bi0。5KxTiO3（x=0。14、0。16、0。18、0。20）基陶瓷为体系，考察了BKT作为第二组元的加入对陶瓷的相组成、微观形貌、压电性能和铁电性能等的影响。其中水热法制备工艺条件为：粉体制备时反应时间24h，反应温度200℃；陶瓷烧结温度1100℃，烧结时间6h。通过SEM分析可知水热法制备的粉末比传统工艺得到的在颗粒球形度、细密度上有了很大提升；结合XRD分析可知陶瓷d33＝131 pC/N ，Ec =31。4 kV/cm，并且在x=0。18附近发现了陶瓷的准同型相界；根据压电性和铁电性测试可得Kp=0。36，Pr=40μC/cm2，Pm =48 μC/cm2。87736

毕业论文关键词： 钛酸铋钠 水热合成 无铅压电陶瓷 压电性能 

毕业设计说明书外文摘要

Title   Study on the preparation and doping effect of BNT

Abstract Piezoelectric materials because of its electrical properties is widely used in the field of sensor and transducer, and sodium bismuth titanate Bi0。5 Na0。5TiO3 (BNT) - based pressure electric material due to its excellent piezoelectric properties, high remanent polarization, high Curie temperature, the advantages of strong ferroelectricity, dielectric constant is small is believed to the most likely alternative to lead based materials, in order to reduce the harm to environment and human lead based materials。 However BNT based ceramics have high coercive field, that polarization is difficult, and it is difficult to Sintering Densification and on the piezoelectric properties have great influence。 This paper selects Bi0。5 Na(1-x)TiO3-Bi0。5KxTiO3 (x=0。14,0。16,0。18,0。20) ceramic matrix for the system。 The effects of the BKT as the second component joining of ceramic phase composition, microstructure, electrical properties and ferroelectric properties of the influence of pressure。 The hydrothermal preparation process conditions for: powder preparation 24h of reaction time, reaction temperature of 200℃; sintering temperature of 1100℃, sintering time is 6h。 By SEM analysis powders prepared by hydrothermal method shows that compared with the traditional process, the obtained in spherical particles, thin density have greatly improved; XRD analysis shows that the ceramic d33＝131 pC/N ，Ec =31。4 kV/cm, and in the vicinity of x=0。18 found in the quasi phase of the ceramic phase; according to the piezoelectric and ferroelectric test can get Kp=0。36，Pr=40μC/cm2，Pm =48 μC/cm2。

Keywords  Lead-free piezoelectric ceramics   Bismuth sodium titanate   Hydro-thermal synthesis   Piezoelectric property

目   次

1  绪论 1源-于,优Z尔%论^文.网wwW.yOueRw.com 原文+QQ752018~766

1。1  压电材料概述 1

1。2  无铅压电陶瓷材料 3

1。3  BNT基压电陶瓷 5

1。4  主要研究内容 7

2  实验 8

2。1  实验原料及仪器 8

2。2  实验过程