Shape change as an indicator of mechanism in the high-pressure structural transformations of CdSe nanocrystals
Shape change as an indicator of mechanism in the high-pressure structural transformations of CdSe nanocrystals
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DOI：
10.1103/physrevlett.84.923
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发表时间：
2000-01
影响因子：
8.6
通讯作者：
Wickham;Herhold;Alivisatos
中科院分区：
文献类型：
--
作者：
Wickham;Herhold;Alivisatos
使用X射线衍射来监测45 A直径的CdSe纳米晶体的结构，因为它们在四重和六重配位晶体结构之间反复转换。衍射图样的模拟显示，当晶体转变时，形状发生变化。他们还表明，堆垛层错产生的过渡，从高压阶段到低压阶段。形状变化和层错的产生对相变的可能微观机制产生了显着的限制。
X-ray diffraction was used to monitor the structure of 45 A diameter CdSe nanocrystals as they transformed repeatedly between fourfold and sixfold coordinated crystal structures. Simulations of the diffraction patterns reveal that a shape change occurs as the crystals transform. They also show that stacking faults are generated in the transition from the high- to the low-pressure phase. The shape change and stacking fault generation place significant constraints on the possible microscopic mechanism of the phase transition.