New Nanocomposite Materials With Novel Dielectric Properties

9319809 Komarneni研究将进行开发具有新颖的介电性能的新型纳米复合材料的基本理解。 我们将采用一种组成纳米复合材料的策略，使用两种或更多种溶胶的钡，锶，钛酸铅，以及锂和铅的钛酸盐，从根本上改变烧结行为和性能相比，从单相凝胶衍生自醇盐，和传统的氧化物混合物制成的材料。 除了这些工艺创新之外，我们还建议制造具有潜在不同特性的新材料，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;以及产品特性纳米复合材料。 在水解之前将纳米颗粒封装在第二溶液中将用于制造复合材料，并且溶胶-凝胶旋涂将用于制造具有不同铁电材料的超晶格结构。 %电瓷材料将使用一种新的加工方法制备，该方法涉及非常细的颗粒，这些颗粒反应形成所需材料的速度更快，温度比其他加工方法低得多。 具有新特性的新材料将通过在非常小的规模上设计混合物来制造。 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化，从而为电容器工业节省大量能源。 预计这项研究将产生的具有新特性的新材料可能会导致新的应用。 该计划的一个重要特点是在材料和加工研究的基本和技术重要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. ***