Processing of Controlled-Microstructure Nanosized Dielectricand Electrostrictive Powders: The Effect of Final Grain Size on Phase Transitions and Dielectric Properties

本研究的主要目的是研究晶粒尺寸对钛酸钡、钛酸铅和铌酸铅镁等重要介质和电致伸缩材料相变和介电性能的影响。这项研究是由新墨西哥大学微工程陶瓷工业/大学合作研究中心和罗格斯大学陶瓷工业/大学合作研究中心联合进行的。新墨西哥大学正在通过一种新的气溶胶分解工艺生产具有可控微观结构、化学纯度和纳米尺寸的前驱体粉末。使用光谱学、显微镜和表面积技术对粉末进行表征。所采用的加工技术包括干压，热等静压和医生刀片带铸造。用膨胀法研究致密化行为。介质性能也进行了表征。这种共同努力是一种自然的合作，因为它利用了每个机构的优势，并产生了比每个机构单独工作的输出总和更多的结果。这项研究对电子陶瓷行业来说是非常及时的。本研究的结果将对薄膜多层静电/压电器件的制造商有一定的参考价值。项目经理建议罗格斯大学通过与新墨西哥大学的“TIE”项目获得为期36个月的75,000美元奖励。

9417469 Safari The primary objective of this research is to study the effects of grain size on the phase transitions and dielectric properties of important dielectric and electrostrictive materials including: barium titanate, lead titanate, and lead magnesium niobate. The research is being performed jointly between the Industry/University Cooperative Research Center for Microengineered Ceramics at the University of New Mexico and the Industry/University Cooperative Research Center for Ceramics at Rutgers University. Precursor powders, with controlled microstructures and chemical purity and nanosized dimensions, are being produced via a novel aerosol decomposition process at the University of New Mexico. The powders are characterized using spectroscopy, microscopy, and surface area techniques. Processing techniques being employed include dry pressing, hot isostatic pressing, and doctor blade tape casting. Densification behavior will be studied using dilatometry. The dielectric properties are being characterized also. This joint effort is a natural collaboration , as it utilizes the strengths of each institution, and results in more than the sum of the output for each working separately. The research is very timely for the electronic ceramics industry. The results of this research will be of use to manufacturers of thin film multilayer electrostatic/piezoelectric devices. The Program Manager recommends Rutgers University be awarded $75,000 for 36 months through a "TIE" project with the University of New Mexico.