Structural Chemistry and Properties of Ceramic Microwave Dielectrics

陶瓷微波电介质的结构化学和性能

• 批准号: 9421184
• 负责人: Peter Davies
• 金额: $ 28.5万
• 依托单位: University of Pennsylvania
• 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: 1995-05-15 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9421184&HistoricalAwards=false
• 关键词: Structural; Chemistry; Properties; Ceramic; Microwave

Davies 9421184 The studies in this proposal focus on the relation between the structures and loss properties of a series of perovskite dielectrics. While these tantalate-based oxides have the lowest losses of all the microwave ceramics, optimization of their properties requires careful control of their chemistry, processing, and degree of structural order. Preliminary investigations made on one of these systems have indicated that the dielectric losses associated with internal domain boundaries can be reduced by introducing selected chemical substituents. The proposal describes a series of experimental studies designed to understand and explain this effect, and outlines new approaches for improving the loss properties of other petrovskite dielectrics. Many aspects of this work are being conducted in close collaboration with scientists from industry, and several aspects of this study are expected to have a direct impact on the processing and production commercial ceramic resonator systems. %%% The goals of this work are to understand what aspects of the structures of the existing microwave dielectric materials are critical in realizing an optimized electronic performance, and to use these crystal chemical insights to enhance the performance of other oxide systems. ***

戴维斯9421184 本论文的研究重点是一系列钙钛矿结构陶瓷材料的结构与损耗性能之间的关系。 虽然这些钽酸盐基氧化物在所有微波陶瓷中具有最低的损耗，但其性能的优化需要仔细控制其化学、加工和结构有序度。 对这些系统之一进行的初步调查表明，与内部域边界相关的介电损耗可以通过引入选定的化学取代基来降低。 该提案描述了一系列旨在理解和解释这种效应的实验研究，并概述了改善其他岩石矿物损失特性的新方法。 这项工作的许多方面都是与工业界的科学家密切合作进行的，预计这项研究的几个方面将对商业陶瓷谐振器系统的加工和生产产生直接影响。 这项工作的目标是了解现有微波介电材料结构的哪些方面在实现优化的电子性能方面是至关重要的，并使用这些晶体化学见解来提高其他氧化物系统的性能。 ***