稀土钐掺杂钛酸铋钠基无铅压电材料的荧光特性

发布时间：2018-02-20 17:09

  本文关键词： 压电 稀土 发光 钛酸铋钠　出处：《内蒙古科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着能源的日益紧缺，多功能材料越来越受到人们的重视，并且在一些高新技术领域已经有了广泛的使用。 压电材料是科技领域中不可或缺的一种非常重要的材料，广泛应用于军事，航空航天，农业等各个领域。但是，目前使用较广泛的是铅基压电材料，，虽然性能优越，但是对人类的生活环境和自身健康都有严重的危害。近年来，学者们对无铅压电材料的研究越来越深入，并取得了可喜的成果。本文就是以被认为是最有希望取代铅基压电材料的钛酸铋钠无铅压电材料为基体，通过掺杂具有色纯度高、能量转换效率高、荧光寿命长以及对抗辐照稳定性强等优点的稀土，研究其光电性能。本论文采用传统的高温固相法，围绕Sm3+掺杂钙钛矿结构的钛酸铋钠材料的结构和发光性能进行了系统的研究。其主要内容包括以下： 采用高温固相法制备了(Bi0.5Na0.5)1-xSmxTiO3无铅压电陶瓷，对其相结构及发光性能进行了研究。首先研究了钐浓度及烧结温度对BNT:Sm3+发光性能的影响。发现其发光性能随钐浓度的增大而升高，并在掺杂浓度为x=0.015时达到最大值，之后产生浓度猝灭效应发光强度迅速下降。烧结温度对发光性能也有很大影响，在900℃-1200℃范围内，随着烧结温度的升高，样品发光强度逐渐增强，并在1150℃时达到峰值，之后发光强度呈下降趋势。 另外，对样品发光强度最大即掺杂浓度为x=0.015时在不同温度下进行了发光性能的测试，在从室温开始加热时，发光强度迅速增强，在160℃左右达到最大值，之后随着测试温度的升高而降低。 根据电荷补偿原理在BNT:Sm3+样品A位掺杂碱金属离子形成(Bi0.5Na0.5)1-2xSmxMxTiO3（M=Li+、Na+、K+），结果发现一价碱金属离子的引入都能显著提高样品的发光强度，其中K+离子提升幅度最大。 本文还研究了铋的浓度和B位掺杂Zr4+取代Ti4+对钛酸铋钠基无铅压电陶瓷发光性能的影响，都显示除了规律性特征，只影响了样品的荧光发射强度，但是上述所有的掺杂取代并没有改变BNT:Sm3+发光的分布状况。依然保持三个强发射峰。
[Abstract]:With the increasing shortage of energy, multifunctional materials have been paid more and more attention, and have been widely used in some high-tech fields. Piezoelectric material is an indispensable and important material in the field of science and technology. It is widely used in military, aerospace, agriculture and other fields. However, at present, it is widely used as lead-based piezoelectric material, although its performance is superior. In recent years, scholars have studied lead-free piezoelectric materials more and more deeply. In this paper, the lead free piezoelectric material of bismuth sodium titanate, which is considered to be the most promising alternative to lead based piezoelectric material, is used as the matrix, which has high color purity and high energy conversion efficiency by doping. The optoelectronic properties of rare earths which have the advantages of long fluorescence lifetime and strong stability against irradiation are studied. In this paper, the conventional high temperature solid state method is used to study the optical and electrical properties of rare earths. The structure and luminescence properties of Sm3 doped sodium bismuth titanate are studied systematically. The main contents are as follows:. Bi0.5Na0.5Na-1-xSmxTiO3 lead-free piezoelectric ceramics were prepared by high temperature solid state method. The phase structure and luminescence properties of the PZT were studied. Firstly, the effects of samarium concentration and sintering temperature on the luminescence properties of BNT:Sm3 were studied. It was found that the luminescence properties increased with the increase of samarium concentration. The luminescence intensity of the concentration quenching effect decreases rapidly when the doping concentration is x = 0.015, and the sintering temperature also has a great effect on the luminescence properties. The sintering temperature increases with the increase of the sintering temperature in the range of 900 鈩

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