Journal of Chemical Physics, Vol.104, No.11, 4324-4329, 1996
Molecular-Reorientation in Ortho-Carborane Studied by Dielectric-Spectroscopy
The dielectric properties of ortho-carborane have been investigated in a broad frequency range of 20 Hz less than or equal to v less than or equal to 1 GHz and at temperatures 10 K less than or equal to T less than or equal to 380 K. At T>275 K the ortho-carborane molecules undergo fast and isotropic reorientations with frequencies larger than 1 GHz. Below a phase transition at T-c approximate to 275 K the reorientation is partly restricted and the dynamics of the remaining reorientational motion is reduced. At 160 K, the dielectric results reveal a small anomaly which we assign to a second phase transition. At temperatures 150 K