弛豫铁电单晶PMN-PT优异电光系数全矩阵测试及其机理研究

项目名称： 弛豫铁电单晶PMN-PT优异电光系数全矩阵测试及其机理研究

项目编号： No.11304061

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 孙恩伟

作者单位： 哈尔滨工业大学

项目金额： 25万元

中文摘要： 本项目将对近年来在国际压电、铁电学术领域引起广泛关注的热点材料体系，弛豫铁电单晶Pb(Mg1/3Nb2/3)O3-PbTiO3(PMN-PT)和In掺杂PMN-PT，的一般光学和线性电光性质进行实验测量与机理研究。首先，通过测量其吸收光谱，确定其光学吸收边位置、禁带宽度和电子跃迁等基本的光谱性质；其次，测量其在不同温度与不同波长情况下，单晶的折射率和电光系数全矩阵参量，讨论晶体的有效电光系数和半波电压等重要电光参数；然后，测量单晶的压电系数全矩阵参量，并在测量得到整套电光和压电参数的基础上，研究单晶的压电-电光联合效应，分析逆压电效应对铁电晶体电光调制性能的影响，以及如何充分利用铁电晶体巨大的逆压电应变去增强晶体的电光调制能力，并进行合理的理论优化设计，找到晶体最佳的电光调制状态；最后，研究此类单晶优异电光性能的机理及其与晶体巨大压电性能之间的关系。

中文关键词： 铁电晶体；电光性能；压电性能；介电性质；

英文摘要： This project will study the optical and linear electro-optic properties of the relaxor ferroelectric single crystals Pb(Mg1/3Nb2/3)O3-PbTiO3(PMN-PT) and In-doped PMN-PT, which are very important functional materials and cause widespread concern in the international piezoelectric and ferroelectric academic fields. Firstly, we will determine the basic spectroscopic properties including the optical absorption edge position, forbidden band width, and the electronic transition by absorption spectrum. Secondly, the refractive indices and full matrix linear electro-optic coefficients of the single crystals will be measured in the case of different temperatures and different wavelengths. The effective electro-optic coefficient of the crystal and the half-wave voltage will be discussed, which are important electro-optic parameters. Then, full matrix piezoelectric constants will be measured, and the combined piezoelectric and electro-optic effects will be studied based on the complete set of electro-optic and piezoelectric constants. We will also study the influence of the inverse piezoelectric effect on the electro-optic modulation of ferroelectric crystals and find the way of how to enhance the electro-optic modulation performance by means of huge inverse piezoelectric effect. We will carry out a reasonable theory for o

英文关键词： Ferroelectric crystal；electro-optic performance；piezoelectric performance；dielectric property；