70纳米/亚微米棒的高压相变研究
High Pressure Studies of nano/sub-micrometer C70 rods
通过溶剂挥发法获得了准一维C70纳米/亚微米棒状晶体，直径为～500 nm，长度为～10µm，呈六方密堆（hcp）结构。利用金刚石对顶砧（DAC）高压装置，采用同步辐射能量色散X光能量色散衍射方法（EDXD）和高压拉曼光谱，研究了压力对C70纳米/亚微米棒结构的影响，实验中最高压力为26.1GPa。结果表明，在准静水压条件下，在23.3-26.1GPa压力范围内，hcp结构的C70纳米/亚微米棒发生了由hcp结构向非晶化的相变，相变压力比体材料高约5GPa，该相变是不可逆相变，而且该相变是由于C70在高压下笼状结构被破坏所导致的。
We have successfully synthesized C70 rods in nano/sub-micrometers scale by evaporating solvent method. The diameter of the as grown C70 rods is～500 nm, and the length is ～10µm. The EDXD pattern and Raman spectroscopy for as –grown sample indicate that the as grown C70 rod is in hcp structure. The pressure-induced structural phase transition has been studied by using DAC combined with EDXD and Raman spectroscopy methods under quasi-hydrostatic pressure up to 26.1GPa. It is found that hcp structure transforms into amorphous phase for C70 rods in the pressure range from 23.3 to 26.1 GPa, which is higher than the transformation pressure for bulk C70 crystals. The phase transition is irreversible and it is induced by the collapse of C70 cage.
刘冰冰、侯元元、罗宗举、刘景、李延春、李晖、姚明光、王霖、B. Sundqvist、刘德弟、邹广田
物理学化学晶体学
70纳米/亚微米棒，同步辐射X光衍射，高压，相变，非晶化
70 rods in nano/sub-micrometer size synchrotron radiation X-ray diffraction high pressure phase transformation amorphous.
刘冰冰,侯元元,罗宗举,刘景,李延春,李晖,姚明光,王霖,B. Sundqvist,刘德弟,邹广田.70纳米/亚微米棒的高压相变研究[EB/OL].(2005-12-30)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/200512-790.点此复制
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