The conductivities of hydrated Li-, Na- and K-A zeolites were measured at room temperature, at pressures of up to 4.8GPa. Anomalous increases in conductivity were observed, at pressures of up to 1.7-1.9GPa, for all of the zeolites. Within this pressure range, the activation volumes for conduction were -1.4, -3.9 and -6.8cm3/mol for the Li-, Na- and K-A zeolites, respectively. The conductivity went through a maximum, at which pressure-induced amorphization occurred. Beyond the maximum, there was a rapid decrease in conductivity; due to the collapse of long-range ordering. Upon decompression, the conductivity increased to values that were higher than the conductivity values at the same pressure during compression.

Ionic Conduction in Hydrated Zeolite Li-, Na- and K-A at High Pressures. M.C.Reuter, R.A.Secco, Y.Huang: Chemical Physics Letters, 2000, 331[2-4], 189-95