| Dielectric Properties of Glasses in the
LiF-LizO-AI(P03)3 System |
A. R. KULKARNI, H. s. MAITI AND A. PAUL
Pages : 100-104
DOI : 10.1080/0371750X.1984.10822692 |
| Abstract |
| Electrical and electrochemical characterization of the ionic conductors
to be used in advanced electrochemical devices is generally
carried out by complex impedance/admittance analysis which separates
electrode polarisation effect from the bulk properties of the
conductor. The characteristic frequency dispersion in the bulk of the
vitreous electrolyte can also be examined by electric modulus which
is the inverse of complex permittivity. The modulus spectra of the
glasses in the LiF-Li20-AI(P03) 3 system have been studied over
wide ranges of frequency (1 00 Hz-1 OM Hz) and temperature (25°-
200°C), using three different electrode materials (Ag, C, Li). An
interesting feature of these modulus spectra is the appearance of a
nearly perfect Debye peak indicative of a single relaxation process.
This has been explained in terms of charge carrier density. The
dielectric constant and the loss tangent of the glasses have also been
calculated. An abrupt rise of dielectric constant at lower frequencies
has been explained by space charge theory and the maximum in the
loss tangent for blocking electrodes (silver and graphite) has been
attributed to the inter-facial polarisation. |
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