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Nanoreactor Engineereng and SPS Consolidation of Nanostructured Multimetal Oxides
|Oleg Vasylkiv 1, Hanna Borodianska 2, Yoshio Sakka 2|
1. ICYS, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
Engineering of multimetal oxide-ceramic nanopowder with precise morphology and homogeneity of the compounds by multiple nanoexplosive technique of preliminary engineered nanoreactors will be described. The concept of in situ engineering of nanoreactors has been suggested. Nanoreactors are engineered aggregates of complex intermediate metastable products of synthesis. This allows localization of the reactions within the volume of a single nanoreactor, which provides the heredity of the final structure of the nanosize product. Nanoreactors were produced by morphology optimization technique and loaded by colloidal impregnation of the C3H6N6O6 into the engineered matrix porous nano-aggregates of intermediate complex compounds. The subsequent initiation of C3H6N6O6 form gaseous products with a temperature of 2500 ºC. The short-term high temperature generated during each explosion enhanced the solubility of the components. The rapid evolution of a large volume of gaseous products dissipates the heat of the process and limits temperature increase, reducing the premature local sinterability among the neighbor particles; and leads to the fragmentation of the surrounding agglomerates. Uniformly aggregated nanosize CGO and 8Y-SZ and CGZYOx were synthesized. Low-temperature SPS consolidation of nanosize engineered aggregates of produced CGO, 8Y-SZ and CGZYOx allows production of nanostructured ceramic for electrolyte application. Ionic conductivity data for nano-grained CGO, 8Y-SZ and CGZYOx solid electrolytes with different average grain size and thickness were obtained and attributed.
Presentation: Oral at E-MRS Fall Meeting 2007, Symposium A, by Oleg Vasylkiv
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-04-10 06:43 Revised: 2009-06-07 00:44