钐-富勒烯插入化合物的拉曼光谱

Raman Spectra of Samarium-Fullerene Intercalation Compounds

采用固态反应法合成了名义组分为SmxC60 (x =1 ,2 ,...,6 )的插入化合物 ,获得了具有正交结构的Sm2 .75C60 超导相和具有体心立方结构的Sm6C60 相。较高Sm浓度的SmxC60 (x≥ 3 )的拉曼谱峰的展宽与减弱可归因于C60 分子的畸变和电 -声子相互作用。拉曼光谱的结果还表明 ,尽管SmxC60 (x =2 ,3 ,4,5 )暴露空气后转变为非晶态 ,但C60 分子畸变反而减小 ;在Sm6C60 非晶态中C60 分子即使存在 ,但其畸变仍然很大 ,或C60

Samarium-fullerene intercalation compounds of nominal composition Sm xC 60 (x=1,2,...,6) has been synthesized by a solids-state reaction method. We obtain a Sm 2.75C 60 super conducting phase with orthogonal structure and a Sm 6C 60 phase with body-centered-cubic structure. The broadening and weakening of Raman peaks of the higher Samarium doped Sm 6C 60 (x≥3) compounds are due to the distortion of C 60 and electron-phonon interaction. The Raman measurements reveal that the distortion of C 60 decrease considerably in Sm xC 60 (x=2,3,4,5) exposed to air, although the fulleride solids have transformed into an amorphous state. The Raman results also show that even though there are the C 60 molecules in the Sm 6C 60 exposed to air, the distortion of C 60 is still very large or the C 60 molecules have been destroyed and become some amorphous carbonide.