Morphotropic Phase Boundary Systems in Ferroelectric Tungsten Bronze Family

铁电钨青铜族中的同形相界系统

• 批准号: 9510299
• 负责人: Ruyan Guo
• 金额: $ 22.2万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9510299&HistoricalAwards=false
• 关键词: Morphotropic; Phase; Boundary; Systems; Ferroelectric

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. ***

本课题将探索含形态取向相边界区的铁电钨青铜材料族中选定固溶体组分的合成与加工。利用激光加热支架生长技术，可以生长小尺寸（直径毫米）的单晶。材料特性将包括结构、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，并获得对性质-结构-组成关系的基本理解。在该材料家族中，各种形态取向相边界系统可能是可用的，并为具有增强和可切换性能的新材料提供了可能性。该项目希望为铁电和电光器件应用中具有理想和可控性能的铁电钨青铜材料的选择，合成和修饰偏向形态相边界提供指导。系统的研究将全面掌握氧化铁电钨青铜的亲晶相边界系统的特征，并对其物理化学性质、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认识。该计划的一个重要特点是在材料和加工研究的基础和技术上具有重要意义的领域培养研究生和本科生，并通过对妇女的支持来提高科学的多样性。该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。＊＊＊