Dielectric Relaxation Measurements in the Protonic Conductors SrCeO3 and SrZrO3

Abstract

Dielectric relaxation spectroscopy has been applied to the protonic conductors SrCe 0.95 Yb 0.05 O 3-α and SrZr 0.95 Y 0.05 0 3-α . In both systems two different types of relaxation peaks were observed which are characteristic of the wet (proton containing) and dry (proton free) state of the samples. They correspond to peaks found by mechanical relaxation. This shows that the defects underlying the relaxation mechanism possess both an electric and an elastic dipole moment thus giving rise to both dielectric and mechanical relaxation.