四硼酸锂压电晶体的生长和孪晶研究

发布时间：2018-02-17 07:14

本文关键词： 四硼酸锂压电晶体坩埚下降法声表面波器件孪晶　出处：《上海应用技术学院》2015年硕士论文　论文类型：学位论文

【摘要】：LBO晶体是一种新型的压电材料,属于四方晶系,在声表面波方面有这优越的性能,并且原料来源广泛,没有环境污染,已经通过我国科学家首创的坩埚下降法实现了工业应用。但是缺陷依然严重影响了大尺寸LBO晶体的工业化生产。研究缺陷的形成机理可以从生产工艺上改进来减少缺陷的生成。我参与了部分的LBO晶体下降法生长,并在实验室长期以来的生产累积的基础上收集了许多含有开裂、气泡、云层和孪晶等宏观缺陷的LBO晶体样品,并对样品进行了抛光、腐蚀等处理。采用自己改良的坩埚下降炉,成功生长了110、011取向的LBO压电晶体,并初步掌握了LBO晶体下降法生长工艺。观察到了LBO晶体中的孪晶形貌是不一样的,但都遵从道芬规律,即可以通过一定的转换,沿着X轴或Y轴旋转180°形成孪晶。在这篇论文里,分析了LBO晶体的孪晶起源和形成机理,对LBO晶体的生长工作提出了一定的建议。
[Abstract]:LBO crystal is a new type of piezoelectric material, which belongs to tetragonal system. It has excellent performance in surface acoustic wave (saw), and has a wide range of raw materials and no environmental pollution. Industrial application has been realized by crucible descent method initiated by Chinese scientists. However, defects still seriously affect the industrial production of large-sized LBO crystals. The mechanism of defect formation can be improved to reduce the production process. Less defect generation. I was involved in partial LBO crystal descent growth, Many samples of LBO crystals containing cracks, bubbles, clouds and twins were collected on the basis of accumulated production in the laboratory for a long time. The samples were polished and corroded. 110,011 oriented LBO piezoelectric crystals were successfully grown, and the technique of LBO crystal descent growth was preliminarily mastered. It was observed that the twinning morphology in LBO crystals was different, but all of them obeyed the Daufen law, that is, they could be converted to a certain extent. Twinning is formed by rotating 180 掳along the X axis or Y axis. In this paper, the origin and formation mechanism of twins in LBO crystals are analyzed, and some suggestions for the growth of LBO crystals are given.
【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB34;O78

【参考文献】