EFFECTS OF PRESSURE ON THE IONIC-CONDUCTIVITY OF AGI-AGPO3 AND KI-AGPO3 GLASSES

Activation volumes (Delta V-A) and activation energies (E-A) are obtai ned for Ag+-ion motion in glasses in AgPO3-KI and ASPO(3)-AgI systems, from studies of the pressure and temperature dependent DC conductivit ies. In AgPO3-AgI glasses, Delta V-A and E-A both decrease monotonical ly with increasing AgI content whereas, in AgPO3-KI glasses, both Delt a V-A and E-A reach maximum values before decreasing at high KI conten ts. This apparently strong coupling between activation volumes and ene rgies is a new result, which suggests that free volume plays a dominan t role in conductivity enhancement in these strongly doped glassy elec trolytes.