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An investigation of β-alumina electrolytes by electric modulus spectroscopy

✍ Scribed by R.J. Grant; M.D. Ingram; A.R. West

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
490 KB
Volume
22
Category
Article
ISSN
0013-4686

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✦ Synopsis

Various types of p-alumina (including single-crystal cylindrical boules, Monofrax flakes and polycrystalline sinters) -have been investigated by electric modulus spectroscopy. The complex electric modulus is identical with the inverse complex permittivity, ie M* = (e*)-', and is also related to the complex impedance by the equation A4 * = joC,Z*; the modulus spectra are obtained by plotting the imaginary component, M", us log (frequency). The single-crystal specimens of p-alumina have spectra markedly broader than simple Debye curves, and in this respect they resemble vitreous and molten electrolytes rather than alkali halide crystals.

The more complicated spectra of the polycrystalline samples show the marked effects of anisotropic conductivity. At the lowest temperatures studied (-16O"C), the current appears to follow a series pathway through crystals in two distinct orientations, and it is apparently not able to seek out a preferred pathway as is the case at higher temperatures.

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