(1-x)KNNS-xSrTiO3铁电陶瓷的制备和表征毕业论文
2022-01-13 10:01
论文总字数：19435字
摘 要
随着时代的发展以及人们越来越多地意识到含铅材料对人体和环境的危害，无铅压电陶瓷的迅速发展正在逐渐取代铅基压电材料的道路上不断前进。铌酸钾钠基压电陶瓷以其在无铅压电陶瓷中的优势，在储能和制动方面有着理想的应用可行性。铌酸钾钠陶瓷是由反铁电的铌酸钠与铁电的铌酸钾所组成的二元固溶体陶瓷，是一种有一定研究前景的无铅压电材料。并且在该材料的组分系统中，进行适当元素的掺杂可以更好的改善性能、扩大应用。
本论文在掺杂改性的基础上，继续采用传统固相法合成 (1-x)KNNS-xST 无铅压电陶瓷材料的制备工艺，主要研究的就是在不同钛酸锶掺杂浓度下，掺杂量x为0.00、0.01、0.02、0.03、0.04五种组分下研究所制备的铌锑酸钾钠压电陶瓷的性能改变情况，比如物相结构、晶粒尺寸分布、电性能等，研究添加钛酸锶对铌锑酸钾钠陶瓷结构、微观形貌和电学性能的影响，优化材料的成分组成。
研究发现，在实验的浓度范围内随着钛酸锶掺杂量的增加，陶瓷的颗粒大小的均匀性增加。通过分析该陶瓷P-E、S-E曲线，发现陶瓷在钛酸锶的掺入时，d33*和Smax呈现先升高后降低的趋势，当钛酸锶掺量为x = 0.02时，发现对(1-x)KNNS-xST陶瓷样品的综合性能较好。
关键词：压电效应 铌酸钾钠基压电陶瓷 掺杂改性 电滞回线
Preparation and Characterization of (1-x)KNNS-xST Ferroelectric Ceramics
ABSTRACT
With the development of times and more and more people realize the harm of lead-free materials to human body and environment the rapid development of lead-free piezoelectric ceramics is gradually replacing the lead based piezoelectric materials. Potassium sodium niobate based piezoelectric ceramics have ideal application feasibility in energy storage and braking because of its advantages in lead-free piezoelectric ceramics. Potassium sodium niobate ceramics is a kind of lead-free piezoelectric material which is composed of antiferroelectric sodium niobate and ferroelectric potassium niobate. Moreover, in the component system of the material, proper element doping can better improve the performance and expand the application.
This paper on the basis of doping modification, continues to use traditional solid-phase synthesis (1-x)KNNS-xST lead-free piezoelectric ceramic materials preparation, the main research is under the different strontium titanate doping concentration, doping concentration is 0.00, 0.01, 0.02, 0.03, 0.04 institute under five components preparation of niobium sodium potassium antimonate performance change situation of piezoelectric ceramics, such as phase structure, grain size distribution, electric properties and so on.The effect of adding strontium titanate on the structure, microstructure and electrical properties of sodium potassium stibiobate ceramics was studied.
It was found that the particle size uniformity of ceramics increased with the increase of strontium titanate doping in the experimental concentration range. By analyzing the P-E and S-E curves of the ceramics, it was found that when strontium titanate was added to the ceramics, d33* and Smax tended to increase first and then decrease increase.When the amount of strontium titanate was x=0.02, it was found that the comprehensive piezoelectric properties of (1-x)KNNS-xST ceramic samples are the better.
Key Words: Piezoelectric effect；Potassium niobate sodium-based ceramics；Piezoelectric ceramics；Hysteresis loop
目 录
摘 要 I
ABSTRACT II
第一章 绪论 2
1.1 压电材料 2
1.2 无铅压电陶瓷 2
1.2.1 含铋层状结构无铅压电陶瓷 2
1.2.2 钛酸铋钠基无铅压电陶瓷 2
1.2.3 钛酸钡基无铅压电陶瓷 2
1.2.4 铌酸盐基无铅压电陶瓷 2
1.3 铌酸盐系无铅压电陶瓷的掺杂与制备 2
1.3.1 水热法 2
1.3.2 放电等离子法 2
1.4 研究内容与目的 2
第二章 实验过程 2
2.1 实验设备与原料 2
2.2 实验设计与过程 2
2.2.1 实验方法 2
2.2.2 实验流程 2
2.2.3 实验测试与表征 2
第三章 实验结果与讨论 2
3.1 不同ST掺量陶瓷的XRD分析 2
3.2 不同ST掺量陶瓷的SEM二次电子像分析 2
3.3 不同ST掺量陶瓷的Pmax、Pr、Ec变化曲线 2
3.4 不同ST掺量陶瓷的S-E曲线 2
第四章 结论与展望 2
4.1 结论 2
4.2 展望 2
参考文献 2
致 谢 2
第一章 绪论
1.1 压电材料
在一定的外力作用下，具有非对称中心结构的晶体，通过晶体内部产生极化，受力面的两端会出现符号不同的电荷，这种效应就是正压电效应；而与之相反的逆压电效应是晶体在其两端施加电场的条件下体积和厚度会发生变化，这两种效应共同组成了压电效应[1]。图1-1展示了压电效应的示意图。
