High Pressure Studies of Nano/Sub-Micrometer C70 Rods

WANG Lin; LIU Bing-Bing; LIU De-Di; HOU Yuan-Yuan; YAO Ming-Guang; ZOU Guang-Tian; LI Hui; LUO Zong-Ju; LI YAN; LIU Jing

Chinese Physics C> 2005, Vol. 29> Issue(S1) : 112-115

High Pressure Studies of Nano/Sub-Micrometer C70 Rods

National Lab of Physics, Superhard Materials of Jilin University, Changchun 130012, China2 Institute of High Energy of Physics, Chinese Academe of Sciences, Beijing 100049, China3 Department of Experimental Physics, Ume\aa University, 90187 Ume\aa, Sweden

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Abstract：
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 26.1GPa, 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.

References

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. Kroto H W, Heath J R, OBrien S C et al. Nature, 1985,318: 1622. Kra.tschmer W, Lamb L D, Fostiropoulos K et al. Nature,1990, 347: 3543. Sundqvist B, Structure, Bonding. 2004, 109: 854. Sundqvist B. Advances in Physics, 1999, 48(1): 15. Duclos S J, Brister K, Haddon R C et al. Nature, 1991,351: 3806. Nú.z-Regueiro M, Monceau P, Hodeau J L. Nature, 1992,355: 2377. Núez-Regueiro M, Abello L, Lucazeau G et al. Phys. Rev.,1992, B46: 99038. Blank V, Popov M, Buga S et al. Phys. Lett., 1994, A188:2819. Maksimov A A, Meletov K P, Osipyan Yu A et al. JETP Lett., 1993, 57: 81610. Sood A K, Chandrabhas N, Muthu D V S et al. Philos.Mag., 1994, B70: 34711. Wasa S, Suito K, Kobayashi M et al. Solid State Communications,2000, 114: 20912. WANG Lin, LIU Bing-Bing, LIU De-Di et al. to be published

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WANG Lin, LIU Bing-Bing, LIU De-Di, HOU Yuan-Yuan, YAO Ming-Guang, ZOU Guang-Tian, LI Hui, LUO Zong-Ju, LI YAN and LIU Jing. High Pressure Studies of Nano/Sub-Micrometer C70 Rods[J]. Chinese Physics C, 2005, 29(S1): 112-115.

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Received: 2005-10-31
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

High Pressure Studies of Nano/Sub-Micrometer C70 Rods

Corresponding author: LIU Bing-Bing,

National Lab of Physics, Superhard Materials of Jilin University, Changchun 130012, China2 Institute of High Energy of Physics, Chinese Academe of Sciences, Beijing 100049, China3 Department of Experimental Physics, Ume\aa University, 90187 Ume\aa, Sweden

Received Date: 2005-10-31

Accepted Date: 1900-01-01

Available Online: 2005-01-02

Abstract: 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 26.1GPa, 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.

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High Pressure Studies of Nano/Sub-Micrometer C70 Rods

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