Böhmer, R.; Loidl, A.: Dielectric properties of fluoromethanes and fluoromethane mixtures. In: Journal of Chemical Physics Nr. 8, Jg. 89(1988), S. 4981-4986, doi: 10.1063/1.455641.

Dielectric measurements were performed on liquid and solid (CF4)1-x (CMF3)x with M=H, Cl, and Br. The dielectric behavior of the polar molecules in the liquid state is well described by an Onsager equation. At the melting point, pure hydrogenated and brominated fluoromethanes condense into dipolar rigid phases, while pure tetrafluoromethane forms a plastic crystal. CClF3 exhibits dipolar relaxational phenomena in the solid state. The data indicate that near the melting point this compound is close to a transition into a plastic phase. Mixtures of CF4 with CHF3 and CBrF3 exhibit monotectic phase diagrams with a limited solubility in the liquid state and complete immiscibility in the solid state. However, formation of mixed crystals is found in (CF4)1-x (CClF3)x which exhibits a eutectic phase diagram.