科研之友
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摘要
Our investigations on porous Si (pi-Si) show that on increase of pressure it undergoes crystalline phase transitions instead of pressure-induced amorphization, as suggested earlier, and the amorphous phase appears only on release of pressure. This amorphous phase, when subjected to higher pressures, transforms reversibly to a higher-coordinated primitive hexagonal phase, showing a kind of memory effect which may be the only example of its kind in the elemental solids. First-principles calculations and thermodynamic arguments help understand these observations.
- 出版日期2011-3-15
