The phase transition and transport properties of Sr<inf>0.56</inf>C<inf>60</inf>O<inf>1.5</inf>

Abstract

X-ray diffraction and dielectric measurement have been applied to investigate the phase transition and transport properties of Sr 0.56 C 60 O 1.5 which is obtained by the reaction of SrCl 2 with C 60 anion aquatic solution. The new compound has a similar structure, but different transport properties as compared with metallic Sr-doped C 60 . X-ray diffraction shows that a first-order phase transition around 100°C is related to the rearrangement of Sr 2+ in the interstitial sites of the C 60 lattice. The step change of ac conductivity near 100°C is also attributed to the hopping of Sr 2+ between interstitial sites. The ionic conductivity indicates the possibility of synthesizing superionic conductors based on C 60 and its derivatives.© 1995 American Institute of Physics.