Controlled synthesis of lithium containing complex oxide powders for functional materials

大量的方法使用粉末作为起始材料。例如，导致陶瓷或复合材料生产的那些。在很大程度上，这种方法的成功取决于颗粒的性质。粒度分布、颗粒形状和表面性质是最突出的。本项目主要致力于合成具有良好颗粒形状的含锂复合氧化物功能材料粉末，如LiAl_5 O_8、LiAl_SiO_4。这一目标将通过开发新的和广泛采用的溶胶-乳液-凝胶程序来实现。通过适当选择工艺参数（起始材料、溶胶流变学和搅拌速度），将生产特定尺寸的凝胶球。为了调整颗粒的表面性质，将特别注意粉末表面官能团的反应性（例如通过硅烷化）。将使用X射线粉末衍射法和热分析（DTA/TG）方法研究凝胶球的热处理引起的相演变。将建立工艺参数和颗粒特性（形成的相、粒度分布、表面极性、适当悬浮液的流变行为）之间的关系，以优化合成条件。

A plethora of methods uses powders as starting materials. For example, those leading to the production of ceramic or composites. To a large extent, the success of such procedures depends on the particle properties. Grain-size distribution, particle shape and surface properties are the most prominent. The present project is mainly devoted to the synthesis of lithium containing complex oxide powders for functional materials, e.g LiAl5O8, LiAlSiO4, with well defined particles shape. This aim will be achieved by the development of new and well-adopted sol-emulsion-gel procedures. Gel spheres with specific sizes will be produced through an appropriate choice of the process parameters (starting materials, rheology of the sol and stirring speed). To tailor surface properties of the particles, special attention will be paid on the reactivity of functional groups at the powder surface (e.g. by silanisations). The phase evolution resulting from the thermal treatment of gel spheres will be studied using X-ray powder diffractometry and thermal analysis (DTA/TG) methods. Relations between process parameters and particle properties (formed phases, grain-size distribution, surface polarity, rheological behaviour of appropriate suspensions) will be established for the optimization of the synthesis conditions.