New Nanocomposite Materials With Novel Dielectric Properties

9319809将开展科马尔内尼研究，以加深对具有新型介电性能的新型纳米复合材料的基本了解。我们将采用一种成分纳米复合策略，使用两种或两种以上的钡、锶、钛酸铅以及锂和铌酸铅溶胶，以从根本上改变由醇盐和传统氧化物混合物衍生的单相凝胶制成的材料的烧结行为和性能。除了这些工艺创新之外，我们还建议制造具有潜在不同性能的新材料，重点放在三类应用上：具有高介电常数和电致伸缩系数的弛豫铁电体；具有导电颗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。在水解前将纳米颗粒包裹在第二溶液中将被用于制备复合材料，而溶胶-凝胶旋涂将被用于制备具有不同铁电材料的超晶格结构。将使用一种新的加工方法来制备电子陶瓷材料，这种方法包括非常细的颗粒，与其他加工方法相比，反应速度更快，温度更低，从而形成所需的材料。通过设计非常小规模的混合物，将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增强致密化，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工艺研究的基础和技术方面对研究生和本科生进行培训。***

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. ***