Dielectric Behavior of Perchloryl Fluoride—An Unusual Rotator Solid

Abstract

Abstract Perchloryl fluoride possesses one of the lowest molecular electric dipole moments, yet the solid exhibits appreciable dielectric absorption with maxima at low temperatures (90–110 K) and 500 Hz-200 kHz frequencies from a Debye relaxation process. The dielectric properties and activation energy of 24.8 kJ mol−1 for molecular reorientation are somewhat unusual for a rotator solid and are discussed in terms of free-volume theory. In the clathrate hydrate condition there is no apparent dielectric dispersion from orientation of the guest ClO3F, although the temperature dependence of the dielectric permittivity suggests possible contributions from dipole rotations and lattice vibrations at low temperatures.