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Unusual transport and structural properties of mechanically treated polycrystalline silver iodide: Part II. Dielectric properties

✍ Scribed by N.F. Uvarov; E.F. Hairetdinov

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 421 KB
Volume: 96
Category: Article
ISSN: 0167-2738
DOI: 10.1016/s0167-2738(97)00005-2

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✦ Synopsis

Dielectric properties of mechanically treated AgI are studied within the frequency range 20 Hz-l MHz. Contribution of the electrode polarization was eliminated and the dielectric permittivity of polycrystalline Agl was extracted. Dielectric properties of mechanically treated AgI are typical of relaxor ferroelectrics with low-frequency dielectric constant E,/E,, ranging from 30 to 200 and high-frequency limit E/E~~ = 8?2 close to the dielectric constant of P-AgI single crystals, Non-linear correlation between conductivity and E, holds, ageing or heating lead to decrease of the both. Results are interpreted by formation of polytypes due to the mechanical treatment. The polytypes formed seem to be electrically active. High values of E, are assumed to be caused by polarization of space charges accumulated on boundaries of electric domains existing in the polytypes.

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