Electrical relaxation of superionic conducting glasses AgX-AgPO3(X=I, Br, Cl)

✍ Scribed by Y. M. Moustafa

• Publisher: Springer US
• Year: 1995
• Tongue: English
• Weight: 440 KB
• Volume: 6
• Category: Article
• ISSN: 0957-4522
• DOI: 10.1007/bf00190543

✦ Synopsis

The complex impedance of superionic conducting glasses (AgX)o.3 -(AgPOa)0.7 (X= I, Br, CI) was measured in the frequency range 5 Hz-500 kHz and temperatures between 299 K and 348 K. The frequency dependence of ~' (the real part of complex conductivity) shows two regions: low and high frequencies. The first is attributed to the electrode-electrolyte polarization, while the second is attributed to the bulk conduction. The replacement of AgCI by AgBr or Agl at the same molar fraction is found to improve the bulk conductivity of the studied glasses. The electrical conductivity spectra exhibit one relaxation peak associated with dielectric loss which arises from the thermally activated jumps of Ag ÷ ions. The dependence of the relaxation time upon the halogen type is discussed in terms of the structural aspects, where the silver halides tend to form microdomains. The special characteristic of fast ionic conduction depending upon halide type is emphasized.