New synthetic processes and characterization of inorganic materials.

本课题组下设三个课题组，分别研究汽—滑反应过程、液—固反应过程和固—固反应过程。每个成员都属于其中一个，并试图在其他成员的持续合作下开发制造先进陶瓷的新工艺。举办了两次全员参加的专题讨论会，相互讨论三个小组的结果，揭示在原子和分子水平上控制反应过程的各种因素。值得注意的几点总结如下。(1)气固反应过程；采用等离子体工艺制备了非氧化物材料（BN， Diamond等）和固体电解质的薄膜。建立了控制膜的微观结构和性能的反应条件。采用激光CVD法制备非氧化物单晶薄膜。(2)液固反应过程；讨论了溶胶-凝胶法制备陶瓷纤维（Al_2O_3, Zro_2）的方法。详细介绍了金属氧化物的溶解度数据。在制备高离子导电率非晶态氧化物的过程中，熔体的快速淬火受到了广泛的关注。(3)固-固反应过程；重点介绍了自传播贡献法与HIPing法的结合。讨论了该工艺的特点和实用性。插层法近年来也引起了人们的兴趣，并应用该方法制备了各种新的功能材料。

This research group consists of three subgroups which concern with vappr to slid reaction process, liquid to solid reaction process and solid to solid reaction process, respectively. Each members has belonged to one of them and attempted to develop new process for fabrication of advanced ceramics with the continued cooperation of other members. Two symposia paticipated with whole members were held to discuss the results obtained in three subgroups with each other and to reveal various factors to controle the reaction process in the level of atom and molecule. Remarkable points are summerized as follows.(1) Vapor-Solid reaction process; Thin films of non-oxide materials (BN, Diamond et al.) and solid electrolytes were fabricated by applying plasma processes. The reaction conditions to controle the microstructure and properties of the films were established. Laser CVD method was also developed to fabricate single crystal films of non-oxides.(2) Liquid -Solid reaction process; Discussions on Sol-Gel methods were focused on the processing forming ceramic fibers (Al_2O_3, Zro_2). The details of the data about hvdrolvsis of metal alboxides were presented. Much attention was denoted to the rapid quenching of melts which was applied to preparation of amorphous oxides with high ionic condoctivity.(3) Solid-Solid reaction process; Self-Propagating Combution method combined with HIPing method was spotlighted. The characteristics and usefulness of the processing were discussed. Intercalation process has also become of interest in recent yeras and variuos new functional materials were prepared by applying the method.