Dielectric and conductivity relaxation in AgI doped silver selenite superionic glasses
- Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032 (India)
Non-Debye relaxation in superionic AgI-Ag{sub 2}O-SeO{sub 2} glasses has been investigated as a function of frequency and temperature. The experimental data have been analyzed in the framework of complex dielectric permittivity and complex electric modulus formalisms. The dielectric permittivity data have been well interpreted using the Havriliak-Negami function. The electric modulus data have been analyzed by invoking Kohlrausch-Williams-Watts function and various parameters describing the relaxation mechanism have been obtained. The temperature and compositional variation in relaxation times and the activation energy, obtained from dielectric permittivity as well as from electric modulus data, have been compared. The low value of stretched exponential parameter implies a highly nonexponential nature of relaxation and is attributed to the correlated ionic motion. The values of the stretched exponential parameter are observed to be independent of temperature as well as composition. Different scaling formalisms have been applied to understand the temperature and compositional dependence of the relaxation mechanism. The scaling of dielectric loss spectra and electric modulus spectra results in master curves, which signifies that the relaxation mechanism is independent of temperature as well as composition.
- OSTI ID:
- 21476521
- Journal Information:
- Journal of Applied Physics, Vol. 108, Issue 7; Other Information: DOI: 10.1063/1.3491045; (c) 2010 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
CHEMICAL COMPOSITION
DIELECTRIC MATERIALS
DOPED MATERIALS
FREQUENCY DEPENDENCE
GLASS
PERMITTIVITY
RELAXATION
RELAXATION LOSSES
SELENIUM OXIDES
SILVER
SILVER IODIDES
SILVER OXIDES
TEMPERATURE DEPENDENCE
CHALCOGENIDES
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
ENERGY LOSSES
HALIDES
HALOGEN COMPOUNDS
IODIDES
IODINE COMPOUNDS
LOSSES
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SELENIUM COMPOUNDS
SILVER COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS