Morphotropic Phase Boundary Systems in Ferroelectric Tungsten Bronze Family

9510299郭本研究项目将探索铁电钨青铜材料家族中含有准同型相界区域的选定固溶体成分的合成和加工。采用激光加热基座生长技术，可以生长出尺寸较小(直径为毫米)的纤维状单晶。将进行材料表征，包括结构、化学、热、铁电(介电和热释电)和电光特性的测量。主要目标是评估这种相边界的特征，并对性质-结构-组成关系有基本的了解。在这一材料家族中有多种准同型相界系统，为具有增强的和可切换的性能的新材料提供了可能性。该项目有望为铁电和电光器件应用中具有所需和可控性能的铁电钨青铜材料的准同型相界的选择、合成和修改提供指导。将进行系统的研究，以全面掌握氧化物铁电钨青铜的准同型相界系统的特征，并对其物理化学性能、宏观和微观结构以及化学成分之间的相互关系有一个基本的了解。该方案的一个重要特点是在材料和工艺研究这一具有根本和技术意义的领域对研究生和本科生进行培训，并通过妇女的支持提高科学的多样性。这项研究将有助于提高用于信息存储和处理的先进光学器件的综合性能。***

9510299 Guo This research project will explore the synthesis and processing of selected solid solution compositions in the ferroelectric tungsten bronze materials family that contain morphotropic phase boundary regions. Single crystals in fiber form of small dimensions ( mm in diameter) will be grown using the laser heated pedestal growth technique. Material characterizations will be carried out that include measurements of structural, chemical, thermal, ferroelectric (dielectric and pyroelectric), and electrooptic properties. The primary goal is to assess the characteristics of such phase boundaries and to gain fundamental understanding of property-structure-composition relations. Various morphotropic phase boundary systems are potentially available in this materials family, and provide possibilities for new materials with enhanced and switchable properties. The project expects to provide guidelines for the selection, synthesis, and modification of the morphotropic phase boundaries of ferroelectric tungsten bronze materials with desired and controllable properties for ferroelectric and electrooptic device applications. %%% Systematic studies will be conducted to obtain an overall grasp of the characteristics of morphotropic phase boundary systems in oxide ferroelectric tungsten bronzes, and a fundamental understanding of the interrelation among physical and chemical properties, the macro- and micro-structure, and the chemical composition. An important feature of the program is the training of graduate and undergraduate students in a fundamentally and technologically significant area of materials and processing research, and to improve diversity in science through the support of women. This research will contribute to improving the general performance of advanced optical devices used in information storage and processing. ***