Abstract
The conductivity of single crystals of pure ammonium perchlorate and of ammonium perchlorate doped with Ba2+ and with [Formula: see text]ions has been measured at a frequency of 1591 Hz between room temperature and 260 °C. All three systems display a marked increase in conductivity at the temperature of the orthorhombic → cubic phase transition. It is suggested that this sudden increase in conductivity is more probably due to secondary effects (specifically, dislocation generation) than to the actual change in crystal structure. The general similarity between the results for pure and doped crystals tends to support a proton transfer mechanism for a.c. conductivity that does not involve vacancies. However, vacancies may be important in d.c. conductance mechanisms.
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