Near Room Temperature Synthesis of Ceria-Zirconia Solid Solution by Solid Phase Reaction
Near Room Temperature Synthesis of Ceria-Zirconia Solid Solution by Solid Phase Reaction
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近室温固相反应合成氧化铈-氧化锆固溶体
DOI：
10.2109/jcersj.108.1257_473
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发表时间：
2000
影响因子：
1.1
通讯作者：
M. Sugiura
中科院分区：
文献类型：
--
作者：
A. Suda;T. Kandori;Y. Ukyo;H. Sobukawa;M. Sugiura
研究了用氧化锆磨和氧化锆球(在乙醇和/或水中)球磨CeO2粉末，在-323K下合成CeO2-ZrO2固溶体的方法。得到了高达60mol%的氧化锆固溶体，它的形成是由于CeO2和氧化锆粉之间的固相反应，接触应力(无论是剪应力还是压应力)增强了固溶体的形成。此外，在固溶前后，CeO_2粉末发生了大的塑性变形、断裂和相互结合。CeO_2-ZrO_2固溶体的晶粒度为≤~(20)nm，在如此低的温度下，易使低扩散的Ce和Zr原子发生重排而形成固溶体。此外，在50mol%CeO_2-50mol%ZrO_2附近，可能存在一种固溶体，其组元的迁移速度比其他组份的迁移速度快得多(或固溶体的稳定性比其他组份高得多)。
The surprisingly low temperature (-323K) synthesis of the ceria-zirconia solid solution upon milling ceria powder with zirconia mill and zirconia balls (in ethanol and/or water) was studied. Solid solutions up to 60mol%ZrO2 were obtained, whose formation was proved to result from solid phase reaction between ceria and zirconia powders, enhanced by contact stress (either shear or compressive one). Furthermore, the occurrence of large plastic deformation, breaking and mutual combining was found on the ceria powder before and after solid solution. The grain size of ceria-zirconia solid solution was ≤20nm, which would cause on easy rearrangement of low diffusion atoms of cerium and zirconium to form the solid solution at such a low temperature. In addition, the possible existence of a solid solution for which the migration of the constituents is much faster (or the stability of the solid at the composition is much higher) than that of other composition, was suggested around 50mol%CeO2-50mol%ZrO2.