...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >High-Pressure Studies on CeO2 Nano-Octahedrons with a (111)-Terminated Surface
【24h】

High-Pressure Studies on CeO2 Nano-Octahedrons with a (111)-Terminated Surface

机译：具有（111）端接表面的CeO2纳米八面体的高压研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In-situ high-pressure X-ray diffraction and Raman spectroscopies have been performed on well-shaped CeO2 nano-octahedrons enclosed by eight (111) planes. The CeO2 nano-octahedrons are shown to be more stable than their bulk counterparts and some other reported CeO2 nanocrystals of smaller size. The transition pressure from cubic to orthorhombic phase is approximately 10 GPa higher than that of 12 nm CeO2 nanocrystals even though they have similar volume expansion at ambient conditions. Additionally, the phase transi- tion to a-PbCl2 phase is very sluggish and uncompleted even up to 55 GPa. The TEM image of the sample after decompression from 55 GPa clearly shows that the nano-octahedrons preserve the starting shape. Such distinct high-pressure behaviors in CeO2 nano-octahedrons have been discussed in terms of their special exposure surface. Further analysis shows that the lower compressibility of the exposed (111) planes in the nano-octahedrons is believed to be the major factor to the elevation of the phase transition pressure and the sluggishness of the transition.
机译：原位高压X射线衍射和拉曼光谱已经在由八（111）个平面包围的形状良好的CeO2纳米八面体上进行了。显示出CeO2纳米八面体比它们的本体对应物和其他一些报道的较小尺寸的CeO2纳米晶体更稳定。从立方相到正交晶相的转变压力比12 nm CeO2纳米晶体的转变压力大约高10 GPa，即使它们在环境条件下具有相似的体积膨胀。此外，相转变为α-PbCl2相非常缓慢，甚至在55 GPa时也无法完成。样品从55 GPa减压后的TEM图像清楚地表明，纳米八面体保留了起始形状。在CeO2纳米八面体中，这种独特的高压行为已经根据其特殊的暴露表面进行了讨论。进一步的分析表明，纳米八面体中暴露的（111）平面的较低可压缩性被认为是导致相变压力升高和过渡缓慢的主要因素。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号