High pressure phase transformations in ammonium halides emerged in conductivity

Abstract

Comparative studies of high pressure effect on the resistance of ammonium halides NH 4X (X = F, Cl, Br, I) at 77-400 K are presented. Conditions and characteristic times of various high-pressure phases formation are determined as a function of the time of pressure treatment duration and temperature. Conductivity and magnetoresistance of NH 4I at pressures above 10 GPa are studied for the first time. © Allerton Press, Inc., 2012.