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Characterization of Electrical Properties of Li(Fe x Al 1− x ) 5 O 8 Solid Solutions by Impedance Spectroscopy
Author(s) -
Arakawa Shuichi,
Sano Junya,
Hayashi Shinsuke
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01620.x
Subject(s) - polaron , conductivity , dielectric spectroscopy , solid solution , materials science , analytical chemistry (journal) , spectral line , spinel , exponent , electrical resistivity and conductivity , ionic conductivity , chemistry , physics , electrolyte , electrode , linguistics , philosophy , quantum mechanics , chromatography , astronomy , metallurgy , electrochemistry , electron
To examine polaronic transport properties in Li(Fe x Al 1− x ) 5 O 8 spinel solid solutions, a scaling analysis for their conductivity spectra and modulus spectra was performed. As in the case of ionic conductors, two significant parameters of a crossover frequency and a power‐law exponent were extracted from the conductivity spectra which displayed the universal dynamic response behavior. Both the mobility and the concentration of carriers were successfully determined from the crossover frequency. The power‐law exponent and the stretching parameter obtained from the modulus spectra varied with composition, implying that the increase in Fe concentration would enhance the Coulomb interactions between small polarons.