PMN-PT基高性能透明陶瓷电控光散射行为的微观机制研究

PMN-PT based high performance transparent electro-optic (EO) ceramics have attracted intensively research interests very recently due to their extraordinary EO properties and broad application prospects. The electric-field-induced light scattering effect in transparent ceramics closely link to the microstructure of materials, espcially the nanoscale polar nanoregions, i. e. nanodomain structures. Besides, field-induced reversible phase transition between ferrelectric and antiferroelectric state also has an remarkably impact on the electric-field-induced light scattering behavior. Therefore, it is of importance to perform the in-situ characterization of macroscopic properties and nanodomain structures under external field in transparent ceramics, in order to reveal the microscopic mechanism of electric-field-induced light scattering effect. In the planning project, multi-external field coupled piezoresponse force microscopy will be developed based on advanced scanning probe microscopy and the nanodomain dynamics in transparent ceramics under multi-external field will be studied. Our research will provied a novel method and experimantal evidences for exploring the microscopic mechanism of electric-field-induced light scattering performance, as well as understanding of novel EO effect in transparent ceramics.

PMN-PT基高性能透明电光陶瓷材料由于其优异的电光性能和广阔的应用前景，近年来成为透明陶瓷材料领域的研究热点。透明电光陶瓷的电控光散射效应与材料的微观结构，特别是纳米尺度极性微区即纳米电畴结构密切相关。此外，外场下反铁电相-铁电相之间的场致可逆相变也对材料的电控光散射效应有重要影响。因此，迫切需要在外场特别是外电场作用下对PMN-PT透明电光陶瓷材料的宏观性能与纳米电畴结构进行原位表征，以揭示材料电控光散射行为的微观机制。本课题拟在先进扫描探针显微术的基础上，针对透明电光陶瓷材料纳米电畴结构及其微区电学性能表征之急需，发展多外场耦合的压电响应力显微镜原位表征平台来开展透明陶瓷材料纳米电畴在多外场耦合作用下动态行为的原位表征研究。本课题研究将为当前迅猛发展的透明陶瓷材料电控光散射效应的微观机制探索提供新的表征手段和实验依据，并为对透明陶瓷材料电光特性的进一步认识和理解奠定基础。

由于其优异的电光性能和广阔的应用前景，钙钛矿相PMN-PT基高性能透明电光陶瓷材料近年来成为透明陶瓷材料领域的研究热点。由于透明电光陶瓷的电控光散射效应与材料纳米尺度极性微区即纳米电畴结构密切相关，而外场下反铁电相-铁电相之间的场致可逆相变也对材料的电控光散射效应有重要影响。因此，在外场特别是外电场作用下对透明电光陶瓷材料的宏观性能与纳米电畴结构进行原位表征，以揭示材料电控光散射行为的微观机制具有重要的研究意义。本项目在先进扫描探针显微术的基础上，针对透明电光陶瓷材料纳米电畴结构及其微区电学性能表征之急需，发展了多外场耦合的压电响应力显微镜原位表征平台，开展了透明陶瓷材料纳米电畴在多外场作用下动态行为的原位表征研究，对稀土元素掺杂的透明电光陶瓷材料中PNRs 的形成、演化及弛豫规律进行了深入探索。本项目研究为对进一步认识和理解透明陶瓷材料电光特性奠定了基础，也为未来透明陶瓷材料电控光散射效应的应用提供了新的理论与实验依据。