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Frequency‐Dependent Conductivity Studies of the Ordered and Disordered Phases of Ag 2 HgI 4 and Cu 2 HgI 4
Author(s) -
Sudharsanan R.,
Clayman B. P.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280137
Subject(s) - conductivity , ion , reflection (computer programming) , spectral line , thermal conduction , analytical chemistry (journal) , materials science , chemistry , condensed matter physics , atomic physics , physics , organic chemistry , chromatography , astronomy , computer science , composite material , programming language
Far infrared reflection and transmission properties of Cu 2 HgI 4 are measured in the region 10 to 200 cm −1 for both, α‐ and β‐phases. The TO and LO mode frequencies are obtained from a Kramers‐Kronig analysis of the reflection spectra. Frequency‐dependent conductivity is calculated from the values of ε″ in the region 10 to 200 cm −1 for both phases. The conductivity spectra of α‐Ag 2 HgI 4 and α‐Cu 2 HgI 4 are analysed using the Kostadinov and Vu Thi Binh model. It is concluded that the mobile ions (Ag + and Cu + ) have two different sites ofo ccupation during their conduction process. It is suggested that other than regular tetrahedral sites, the mobile ions may occupy interstitial sites, in good agreement with the observations of Kasper and Browall and the Wiedersich and Geller model for the conduction process in these materials.