Microstructure control of functional ceramics ih double oxide system by homogeneous solution methods

功能陶瓷的优秀特性已经被形成多氧化物的多氧化物所发现，它们在软解决方案过程中的准备可能导致新的元稳定层化合物具有不同特性的堆叠结构单元的几种特性。这一过程也可以应用于微结构控制。在目前的研究中，我们已经开发了两种新的软件解决方案过程。（1）柑橘酸被添加到金属硝酸盐的混合溶液中，作为其凝胶剂，在350℃下燃烧的凝胶，导致功能陶瓷的精细粉末合成，其直径小于100纳米。此过程已应用于透明导电（ZnO）_3In_2O_3，也可用于barium十六进制ferrite。EDTA或乙酰丙酮酸复合体的使用对一种成分的羟基形成有影响，对不同源性产生影响。这种燃烧综合症也是非常有用的，可以用氧化锆涂上氧化铝粉末。（2）微重力条件被应用于混合金属盐的一个稳定解决方案后冻结。在这一过程中形成了有毒的冰。冰冻的产品是在真空中融化的。hh0线的相对x射线强度增强了ZrOCi_2·8H_2O和AlCl_3 6H_2O的四晶体限制。Liner Complex on unit ordered much better under micro gravity than在环境条件下改进的同源性已被观察到在危险性冰淇淋中发现的盐在环境条件下从冰冻产品中获得的盐。“同源性是有效的在高yield使用双氧化物。”

Excellent properties of functional ceramics have been attained by forming multinary oxides, Their preparation in soft solution process may lead to new meta-stable layered compounds having several kinds of stacking structural units with different properties. This process can also be applied to their micro-structure control. In the present study, we have developed two kinds of the following new soft solution process.(1) Citric acid was added to the mixed aqueous solution of metal nitrates as its geling agent The firing of the gel at 350℃ lead to combustion synthesis of fine powder of functional ceramics with a diameter of less than 100 nm. This process was applied to transparent conducting (ZnO)_3In_2O_3 and also to barium hex ferrite. Usage of EDTA or acetylacetonate complex was effective to avoid inhomogeniety due to the hydroxide formation of a component. This combustion synthesis was also useful to obtain zirconia coated alumina powder.(2) Microgravity condition was applied during freezing of aqueous solution of mixed metal salts. Dendritic ice was formed in this process. The frozen products were freeze dried in vacuum. Relative x-ray intensity of hh0 lines was enhanced in tetragonal crystal strictures ofZrOCi_2・8 H_2O and AlCl_3 6 H_2O. Liner complex ion units ordered much better under microgravity than in ambient condition. Improved homogeniety was observed on the precipitated metal salts in the dendritic ice in comparison to the salts obtained from the frozen product in ambient condition. The homogeniety was effective to obtain double oxide in high yield.