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Chemical diffusion in mixed conductors: α′-Ag2Te and β-Ag2Se

✍ Scribed by W. Sitte

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
458 KB
Volume
94
Category
Article
ISSN
0167-2738

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✦ Synopsis

The silver chalcogenides o'-Ag,+,Te and P-Ag,,, Se represent two contrary examples regarding the composition dependence of the chemical diffusion coefficient. Whereas in the vicinity of the stoichiometric composition the coulometric titration curve of P-Ag,Se is determined by the chemical potential of the silver ions (due to its cationic Frenkel disorder), the coulometric titration curve of cY-Ag,Te is determined by the chemical potentials of the electrons (due to its structural disorder). The experimentally determined maximum of the chemical diffusion coefficient, in the case of a-Ag, , ,Te, near the stoichiometric point as well as the monotonic decrease of the chemical diffusion coefficient with decreasing silver activity in the case of P-Ag z+RSe, can be explained in detail.

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