In situ HREM observation of crystalline-to-gas transition in nanometer-sized Ag particles
In situ HREM observation of crystalline-to-gas transition in nanometer-sized Ag particles
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DOI：
10.1103/physrevlett.96.075504
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发表时间：
2006-02-24
影响因子：
8.6
通讯作者：
Mori, H
中科院分区：
文献类型：
--
作者：
Lee, JG;Lee, J;Mori, H
银原子从纳米级银粒子的升华，即晶体到气体的转变，已经被高分辨率电子显微镜直接观察到。在950 K的温度下，石墨衬底上大约9纳米大小的结晶银粒子发生了银原子的显著升华。升华过程一直持续到整个银粒子消失。在此过程中未发生颗粒熔化。在950 K温度下，石墨表面的纳米级银粒子的高宽比约为0.65，并且在粒子的升华收缩过程中该比值变化不大。
Sublimation of silver atoms from a nanometer-sized silver particle, namely, the crystalline-to-gas transition, has been directly observed by high resolution electron microscopy. Remarkable sublimation of silver atoms took place at 950 K from an approximately 9-nm-sized crystalline silver particle on the graphite substrate. The sublimation continued until the whole silver particle disappeared. No melting of the particle occurred during this process. The height-to-width ratio of a nanometer-sized silver particle on graphite at 950 K was about 0.65, and the ratio did not change so much during the sublimation-induced shrinkage of the particle.