Dielectric and Calorimetric Properties of New Structurally-Predicted Ferroelectric Materials

该项目将教育目标与研究结合起来，制定两个主要标准来预测极性晶体中的铁电性。差示扫描量热法和差示热分析用于确定新铁电材料中预测相变的存在，然后测量新材料的熔点，分解温度和非线性介电磁化率。目前，已知有300种纯材料表现出铁电性。该项目侧重于15种尚未完全表征的新型潜在铁电体。对具有优异性能的新型铁电体的技术需求非常强劲，这些铁电体可以广泛用于各种器件，包括压电换能器和执行器、热释电传感器、高介电常数介质、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系数电阻率器件。本项目的教学与研究相结合，将向本科生介绍许多化学和物理过程，这些过程对铁电体的各种应用进行评估很重要。这种专业知识将使这些学生在就业市场上具有很强的竞争力。

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.