C＿（60）单晶生长及特性的研究

GROWTH AND CHARACTERIZTION OF C_(60) SINGLE CRYSTAL

用气相生长法生长了最大线度约为１．５ｍｍ的Ｃ＿（６０）单晶。单晶Ｘ射线衍射分析结果表明，该Ｃ＿（６０）单晶为ｆｃｃ结构，晶格常数为１．４１３ｎｍ，在２５１Ｋ附近与相变有关的电导率的尖锐跳变表明，Ｃ＿（６０）单晶具有很高的纯度和良好的均匀性。观察到在２７４Ｋ附近激活能的变化，这可能是另一个相变的反映。

The C_(60) single crystals up to mm-size were grown。x-ray diffraction result showsthat C_(60) single crystal is of fcc structure,with lattice parameter of 1.413 nm。Anabrupt change of conductivity(at 25 1K) related to the phase transition shows thatC_(60) single crystal is of high purity and homogeneity.A drop of activation energyaround 2 74K was observed.This activation energy drop may be an indication ofanother phase transition。