| Novel Low Temperature Synthesis Method of Ceramic Oxide Materials |
| Kenji TODA |
| Niigata University |
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In generally, ceramic oxide materials were synthesized by a high-temperature solid-state reaction method because of simple and inexpensive preparation techniques. However, the synthesis at high temperature leads to increase in the processing cost and irregular particle morphology of the obtained powders [1]. In order to synthesize the ceramic oxide materials having uniform particle morphology at low temperature, therefore, liquid phase reaction methods, such as co-precipitation method, sol-gel method, reverse micelle process, hydrothermal process, and others, usually used on an industrial scale. In addition, some methods using organic acid as a solvent should be effectively synthesized in a single phase of ceramic oxide materials at room temperature without special equipment. However, the most of liquid phase reaction methods require special washing and separation processes because these method generally use the strong basic and acid or organic acids [2]. The special washing and separation processes also contribute to increase the processing cost.
In contrast, we have proposed the novel synthesis methods to synthesize the ceramic oxide materials in a single phase form at low temperature without after heat treatment and the basic and acids. We found that some compounds can be synthesized at room temperature just by mixing of raw materials and the reaction is promoted by a small amount of water addition [3-5]. We refer to this method as a water assisted room temperature solid state reaction (WASSR) method. Furthermore, we are also demonstrated that the some ceramic oxide materials can be synthesized in a single phase form with keeping the hydrate raw material mixtures in reactor shell at low temperature below 100 ¨¬C, so called solid hydrate thermal processing.
In this study, we presents the effect and availability of the our original novel solid state reaction methods on an industrial application in the ceramic oxide materials synthesis processing as the basis of the results obtained by these method.
References:
[1] J. H. Sharp, G. W. Brindley, and B. N. Narahari Achar, J. Am. Ceram. Soc., 49 (1966) 379.
[2] F. M. Nirwan, T. K. G. Rao, P. K. Gupta, and R. B. Pode, Phys. Stat. Sol. (a), 198 (2003) 447.
[3] K. Toda, M. Sato, K. Uematsu, and T. Ishigaki, Japanese Unexamined Patent Application Publication No. 2011-16670 (2009).
[4] A. Toda, K. Uematsu, T. Ishigaki, K. Toda, and M. Sato, Abstract of 216th ECS Meeting (2009), #3224.
[5] T. Kaneko, K. Uematsu, T. Ishigaki, S. W. Kim, K. Toda, M. Sato, J. Koide, M. Toda, and Y. Kudo, Abstract of Internationals Symposium on the Reactivity of Solids 2014 (ISRS-18) (2014), P258
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