Dynamical behavior of Ag ions on structural and dielectric features of As2O3 glass ceramics containing chalcogenide oxides

In this work, As2O3 glasses mixed with two chalcogenide oxides (SeO2 and TeO2) and doped with varied contents of Ag2O were prepared and heat-treated. Characterized by various techniques suggested that these glasses were embedded with Ag3AsO4 crystal phases and Ag0 metallic particles (MPs). Later, different dielectric parameters viz., dielectric constant (ε′), electric modulus (M), electrical impedance (Z). conductivity a.c. conductivity a.c. conductivity and σac were measured over broad frequency (ω) and temperature (T) regions. Observed decrement in ε′, σac with Ag2O up to 0.5 mol% was understood due to the increased fraction o As5+ ions that occupy network-forming positions with AsO4 units. The observed increase o these parameters with Ag2O beyond 0.5 mol% was attributed to the growing fraction of Ag0 MPs that acted as modiers. The variation o σac with Ag2O content was analyzed using different conduction mechanisms. Overall, it is predicted that greater than 0.5 mol% of silver oxide is preferable for achieving better ionic conductivity in these glasses