Dielectric and Calorimetric Properties of New Structurally-Predicted Ferroelectric Materials

新型结构预测铁电材料的介电和量热特性

• 批准号: 0137323
• 负责人: Panos Photinos
• 金额: $ 22.21万
• 依托单位: Southern Oregon University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0137323&HistoricalAwards=false
• 关键词: Dielectric; Calorimetric; Properties; New; Structurally

This project is integrates educational objectives with research in developing two major criteria to predict ferroelectricity in polar crystals. Differential scanning calorimetry and differential thermal analysis are used to determine the presence of the predicted phase transitions in new ferroelectric materials, followed by the measurements of the melting point, decomposition temperature, and the nonlinear dielectric susceptibilities of the new materials. Presently, 300 pure materials are known that exhibit ferroelectricity. This project focuses on 15 new potential ferroelectrics that have not been fully characterized.%%% Technological demand is strong for new ferroelectrics with superior figures of merit that can be used in a wide range of devices including piezoelectric transducers and actuators, pyroelectric sensors, high-permittivity dielectrics, electrooptic and nonlinear optic devices, nonvolatile dynamic random access memories, and positive temperature-coefficient-of-resistivity devices. The integration of education with research in this project will introduce undergraduate students to many chemical and physical processes important in the evaluation of ferroelectrics for various applications. This type of expertise will make these students very competitive in the job market.

这个项目是将教育目标与研究相结合，开发两个主要标准来预测极性晶体中的铁电性。用差示扫描量热法和差热分析来确定新铁电材料中是否存在预测的相变，然后测量了新材料的熔点、分解温度和非线性介电极化率。目前，已知的300种纯材料具有铁电性。该项目关注15种尚未完全表征的新型潜在铁电材料。%技术需求旺盛，需要具有优异品质因数的新型铁电材料，可用于各种器件，包括压电式换能器和致动器、热释电传感器、高介电常数电介质、电光和非线性光学器件、非易失性动态随机存取存储器和正温度-电阻系数器件。在这个项目中，教育和研究的结合将向本科生介绍许多化学和物理过程，这些过程在各种应用的铁电材料的评估中非常重要。这类专业知识将使这些学生在就业市场上非常有竞争力。