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Reaction and Diffusion in Silver‐Arsenic Chalcogenide Glass Systems
Author(s) -
HOLMQUIST GLENN A.,
PASK JOSEPH A.
Publication year - 1979
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1979.tb19050.x
Subject(s) - amorphous solid , selenide , chalcogenide , valence (chemistry) , analytical chemistry (journal) , sulfide , chemistry , diffusion , metal , ion , materials science , inorganic chemistry , mineralogy , crystallography , thermodynamics , metallurgy , selenium , physics , organic chemistry , chromatography
The diffusion of Ag from the metal or Ag 2 Se in amorphous As 2 S 3 and As 2 Se 3 at 175°C is accompanied by the reduction of As from a valence of 3+ to 2+ or 2+ to 1 + to maintain charge neutrality in the glass. Only Ag + diffuses at this temperature; all other ions are essentially immobile. An amorphous reaction‐product phase is formed in the diffusion zone with a composition range of 28.6 to 44.4 at % Ag. The lower limit corresponds to all As cations of 2+ valence (equivalent to amorphous Ag 2 As 2 S 3 ); the upper limit, the maximum solubility of Ag in these glasses, corresponds to all As cations of 1 + valence (equivalent to amorphous Ag 1 As 2 S 3 ). The diffusivity of Ag in these glasses at 175°C for concentrations of 10 to 35 at.% Ag is Sulfide 4× 10 −14 exp[(+0.23±0.01)(at.% Ag)]cm 2 /s Selenide 2′ 10 −11 exp[(+0.14±0.01)(at.% Ag)]cm 2 /s