New Nanocomposite Materials With Novel Dielectric Properties

研究将对具有新型介电性能的新型纳米复合材料有一个基本的认识。我们将采用一种合成纳米复合材料策略，使用钡、锶、钛酸铅、锂和铌酸铅的两种或两种以上溶胶，从根本上改变烧结行为和性能，而不是由醇氧化物和传统氧化物混合物制成的单相凝胶。除了这些工艺创新之外，我们建议制造具有潜在不同性能的新材料，重点关注三类应用：具有高介电常数和电致伸缩系数的弛豫铁电体；具有导电晶粒和绝缘边界的纳米复合材料以及产品性能纳米复合材料。在水解之前将纳米颗粒封装在第二种溶液中用于制造复合材料，溶胶-凝胶自旋涂层将用于制造不同铁电材料的超晶格结构。电陶瓷材料将采用一种新的加工方法制备，这种方法涉及非常细的颗粒，与其他加工方法相比，这些颗粒可以在相当低的温度下更快地反应形成所需的材料。通过在很小的尺度上设计混合物，可以制造出具有新性能的新材料。这种制造铁电材料的策略有望在较低的烧结温度下提高致密性，从而为电容器行业节省大量能源。这项研究有望产生具有新性能的新材料，可能会带来新的应用。该计划的一个重要特点是在材料和加工研究的基础和技术上具有重要意义的领域培养研究生和本科生。＊＊＊

9319809 Komarneni Research will be carried out to develop a fundamental understanding of new nanocomposite materials having novel dielectric properties. We will employ a compositional nanocomposite strategy using two or more sols of the barium, strontium, lead titanates, as well as lithium and lead niobates to radically change the sintering behavior and properties compared to materials made from single phase gels derived from alkoxides, and traditional oxide mixes. In addition to these processing innovations, we propose to make new materials with potentially different properties focusing on three classes of applications: relaxor ferroelectrics with high permittivity and electrostrictive coefficients; nanocomposites with conducting grains and insulating boundaries; and product-property nanocomposites. Encapsulation of nanoparticles in a second solution before hydrolysis will be used to make composites, and sol-gel spin coating will be used to make superlattice structures with different ferroelectric materials. %%% Electroceramic materials will be prepared using a new processing approach which involves very fine particles that react to form the desired material faster and at considerably lower temperature than with other processing methods. New materials with novel properties will be made by designing mixtures on a very small scale. This strategy of making ferroelectric materials is expected to result in enhanced densification at lower sintering temperatures which can lead to considerable energy savings for the capacitor industry. New materials with novel properties that are expected to result from this research may lead to new applications. An important feature of the program is the training of graduate and undergraduate students in a fundamentally and technologically significant area of materials and processing research. ***