Nonlinear, Glassy, and Relaxor Behavior in Ferroelectrics

9805272施密特在这个项目中，三类铁电（FE）材料的性能。将被调查。 它们包括质子玻璃和相关的晶体，弛豫铁电体和钛氧铁电体。 质子玻璃和相关的氢键晶体表现出遍历性、质子隧穿、相共存和快离子导电性等现象。 钛氧家族，突出的，因为出色的二次谐波产生性能，有关于FE域和一维导电性的问题，而弛豫铁电体（晶体与不同价阳离子随机位于适当的网站）提出的问题，部分或完全抑制FE过渡。 将调查属于这三个类别中任何一个的不同材料。 具体的研究涉及使用各种技术，如量热法、四极微扰核磁共振、原子力显微镜、拉曼和布里渊光谱和光学测量等。 该研究受益于大量合作者的参与，他们为该项目带来了额外的实验和理论专业知识。 这项研究的好处之一是提高了对各种铁电材料行为的理解。这将有助于将其纳入先进的技术设备。 研究生和博士后研究助理将在21世纪具有特殊就业机会的重要技术领域接受培训。%这是晶体铁电材料的基础研究。这项研究是与研究生，博士后研究助理和外部合作者进行的。 这个项目的好处将是新的、改进的技术设备。学生和博士后研究人员将在21世纪世纪具有特殊就业机会的领域接受出色的培训。**

9805272SchmidtIn this project the properties of three classes of ferroelectric (FE) materials. will be investigated. They include proton glasses and related crystals, relaxor ferroelectrics, and titanyl ferroelectrics. Proton glasses and related H-bonded crystals show such phenomena as ergodicity, proton tunneling, phase coexistence, and fast ion conductivity. The titanyl family, prominent because of excellent second harmonic generation properties, has questions concerning FE domains and one-dimensional conductivity, while relaxor ferroelectrics (crystals with unlike-valence cations randomly located at appropriate sites) pose problems relating to partly or fully suppressed FE transitions. Different materials belonging to any one of these three categories will be investigated. Specific studies involve the use of various techniques such as, calorimetry, quadrupole-perturbed nuclear magnetic resonance, atomic force microscopy, Raman and Brillouin spectroscopy and optical measurements, and others. The research benefits from the participation of a large number of collaborators who bring additional experimental and theoretical expertise to this project. Among the benefits that will result from this research are improved understandings of the behaviors of a large variety of ferroelectric materials. This will facilitate their incorporation in advanced technological devices. Graduate students and post doctoral research associates will receive training in an technologically important area with exceptional employment opportunities in the 21st Century.%%%This is a fundamental study of crystalline ferroelectric materials. The research is conducted with graduate students, post doctoral research associates and external collaborators. The benefits accruing from this project will be new, improved technological devices. Students and post doctoral research associates will receive excellent training in an area with exceptional employment opportunities during the 21st Century.**