It was noted that the conductivity of dolomite was a decreasing function of pressure; thus indicating that the predominant mechanism was ionic. A linear fit to the data indicated that the activation volume was 19cm3/mol. A curvature of the conductivity plots was explained in terms of the activation of additional conductivity mechanisms, or in terms of a pressure variation of the activation volume. Upon using a second-order polynomial fit, the zero-pressure value of the activation volume was deduced to be 16.5cm3/mol.

A.N.Papathanassiou, J.Grammatikakis: Physical Review B, 1996, 53[24], 16247-51