The alternating-current conductivity was measured at temperatures of between 365 and 704K, under pressures of between 6.3 and 49.5kbar. A decrease in conductivity occurred with increasing pressure, as did a decrease in the conductivity jump at the phase transition, during 1atm differential scanning calorimetric and dilatometric studies. This behavior was consistent with the operation of a simple volume-controlled cationic conduction mechanism. A shift of the transition to higher temperatures, with increasing pressure, was in agreement with Le Chatelier’s principle.

R.A.Secco, E.A.Secco: Journal of the Physics and Chemistry of Solids, 1995, 56[8], 1045-51