Lee Jong-Sook, Lee Ju-Wook, Lee Jeong Yong, Adams Stefan, Guo Yu-Guo, Maier Joachim
School of Materials Science and Engineering and The Research Institute for Catalysis, Chonnam National University, Gwangju 500-757, Korea.
J Nanosci Nanotechnol. 2010 May;10(5):3341-5. doi: 10.1166/jnn.2010.2294.
The extraordinary high ionic conductivity and the phase transition with large thermal hysteresis of AgI:Al2O3 nanocomposites can be ascribed to the presence of unusual polytype 7H and 9R modification of AgI as mesoscopic heterostructures. In addition to the 7H AgI phase in the composites previously identified by a Rietveld analysis of X-ray diffraction, a new 9R AgI polytype with a characteristic three-fold contrast was directly evidenced by high resolution transmission electron microscopy. The epitaxial intergrowth of various polytypes was also microscopically evidenced which is in accordance with the Rietveld analysis.
AgI:Al₂O₃纳米复合材料具有极高的离子电导率以及具有大热滞的相变，这可归因于存在异常的7H和9R多型体修饰的AgI作为介观异质结构。除了先前通过X射线衍射的Rietveld分析确定的复合材料中的7H AgI相外，高分辨率透射电子显微镜直接证实了一种具有特征性三重对比度的新型9R AgI多型体。各种多型体的外延共生也通过显微镜得到了证实，这与Rietveld分析结果一致。
