钽铌酸钾系列材料的制备表征及其性质研究

发布时间：2018-05-15 06:22

  本文选题：功能材料 + 无铅铁电压电材料　； 参考：《东北师范大学》2017年硕士论文

【摘要】：当前,材料、能源和信息技术被人们誉为当代社会文明发展的三大支柱。而在现代材料科学领域里,功能材料一直都是科学研究的重点和热点。随着科技的发展,当今社会对性能优异和功能各异的功能材料的需求越来越迫切。铁电压电材料作为一类重要的功能材料,由于其优异的铁电压电性能、非线性光学性能和热释电性能等得到广泛的关注和研究。锆钛酸铅(PZT)作为传统铁电压电材料的典型代表,对光电力热的反应都非常敏感,在光电响应、吸收系数等诸多方面展现出优异性能,但是其中含有的铅对环境污染很大,同时对健康也有严重的危害。因此无铅铁电压电材料吸引了广大科研人员的兴趣,其中,钽铌酸钾(KTN)系列材料是一种重要的无铅铁电压电材料。KTN材料由于其具有良好的非线性光学效应、电光效应和热释电效应,因此在计算机显示、光存储、光通讯以及光电子等领域展示良好的应用前景。因此,探索和研究KTN铁电材料及其基本性能,对于基础研究和开拓新材料应用领域均具有重要意义。本文在系统总结和分析了KTN铁电压电材料研究现状的基础上,主要研究了:1.碱金属钽铌酸盐材料的制备条件,利用热失重分析等测试手段考察了反应原料Li2CO3、K2CO3、Ta2O5和Nb2O5各自的热解特性,对KT、KN、KTN和LN材料相应的化学计量比配置原料粉体进行了20~1000℃温度范围内的热失重和热流分析,探讨了上述反应过程中所涉及的机理,确定了相应材料的最佳合成条件,并制备获得了KT、KN、KTN和LN四种粉末材料。2.通过X射线衍射(XRD)研究了KT、KN、KTN和LN四种材料的晶体结构,研究发现KT为立方相,KN为正交相,KTN为四方相,LN为三角相,并分析了相应的晶格参数。电镜照片显示所制备的材料为颗粒状,尺寸在纳米至亚微米之间,同时,通过对其复介电常数的测试和分析研究,发现在微波高频率频段范围,系列材料具有较好的光电效应。3.使用第一性原理对KT、KN、KTN和LN进行了几何结构优化,能带态密度分析,并对其介电常数进行计算,将结果与实验结果进行比对分析,发现实验测试结果与模拟结果吻合较好,验证了KT、KN、KTN和LN测试结果的可靠性。计算和实验结果均显示:KTN系列材料在广义电磁波微波频率高频范围具有的介电常数特性,在光电响应领域具有良好的应用前景。
[Abstract]:At present, materials, energy and information technology are praised as the three pillars of the development of contemporary social civilization. In the field of modern material science, functional materials have always been the focus and hotspot of scientific research. With the development of science and technology, the demand for functional materials with excellent performance and different functions is becoming more and more urgent. As a kind of important functional materials, ferroelectric materials have been widely studied for their excellent ferroelectric properties, nonlinear optical properties and pyroelectric properties. As a typical representative of traditional ferroelectric materials, lead zirconate titanate (PZT) is very sensitive to photoelectrothermal reactions and exhibits excellent performance in many aspects, such as photoelectric response, absorption coefficient, etc. At the same time, there are serious health hazards. Therefore, lead-free ferroelectric materials have attracted the interest of many researchers. Among them, potassium tantalum niobate (KTNN) series is an important lead-free ferroelectric material. KTN has good nonlinear optical effect. The electro-optic effect and pyroelectric effect show a good prospect in the fields of computer display, optical storage, optical communication and optoelectronics. Therefore, it is of great significance to explore and study KTN ferroelectric materials and their basic properties for basic research and development of new materials applications. On the basis of systematically summarizing and analyzing the current research situation of KTN ferroelectric materials, this paper mainly studies the content of 1: 1. The preparation conditions of alkaline tantalum niobate materials were investigated by thermogravimetric analysis. The pyrolysis properties of Li2CO3 / K2CO3 / Ta2O5 and Nb2O5 were investigated. The thermogravimetric and heat flux analysis of the stoichiometric ratio of KTN KTN and LN materials was carried out in the temperature range of 20 鈩，

本文编号：1891335