A volumetric and dielectric study of m-fluoroaniline under pressure

We have studied the mass density and the dielectric permittivity of the glass forming liquid meta-fluoroaniline under hydrostatic pressure up to 700 MPa. Isothermal, isobaric, and isochoric glass transitions were induced which demonstrate the dependence of the glassy state on the thermodynamic path. The pressure dependence of the secondary relaxation and of the glass transition/melting temperature and the lower density of the pressure-induced glass compared to the liquid support a cluster model with defects for this hydrogen bonded glass.