Pressure induced dimerisation of C-70

被引:38
作者
Premila, M
Sundar, CS
Sahu, PC
Bharathi, A
Hariharan, Y
Muthu, DVS
Sood, AK
机构
[1] INDIRA GANDHI CTR ATOM RES,DIV MAT SCI,KALPAKKAM 603102,TAMIL NADU,INDIA
[2] INDIAN INST SCI,DEPT PHYS,BANGALORE 560012,KARNATAKA,INDIA
关键词
fullerenes; phase transitions; optical properties;
D O I
10.1016/S0038-1098(97)00317-7
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Solid C-70 has been subjected simultaneously to high pressures and temperatures (HPHT), with pressures upto 7.5 GPa and temperatures upto 750 degrees C. X-ray diffraction measurements on the recovered samples indicate that the initial h.c.p. solid C-70 transforms to a rhombohedral structure which recovers to an f.c.c. structure on annealing. The associated changes in the intra molecular vibrational modes have been probed through infrared: (IR) and Raman measurements. The IR measurements on these HPHT samples; show splitting of some of the pristine modes and occurrence of several new modes These sharp IR modes in the HPHT treated samples, which are seen to-be different from that reported for photopolymerised C-70, have been attributed to the formation of C-70 dimers. (C) 1997 Published by Elsevier Science Ltd.
引用
收藏
页码:237 / 242
页数:6
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