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Influence of Pseudo‐Alkali Cations on Network Depolymerization in Mixed‐Cation Germanate Glasses
Author(s) -
RIEBLING E. F.
Publication year - 1973
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.1151-2916.1973.tb12344.x
Subject(s) - depolymerization , germanate , alkali metal , chemistry , inorganic chemistry , analytical chemistry (journal) , absorption (acoustics) , refractive index , mineralogy , materials science , ion , organic chemistry , optoelectronics , composite material
Mixed‐cation germanate glasses that contained ≥69 mol% GeO 2 and equimolar amounts of Na 2 O/K 2 O, Ag 2 O/Tl 2 O, Tl 2 O/K 2 O, or Ag 2 O/K 2 O were prepared. Densities, refractive indices, and infrared absorptions were measured and colors noted. In all glasses, the expected shift of the ir absorption to longer wavelengths is enhanced by the presence of the second cation. The mixed‐alkali glasses are less voluminous and the mixed‐cation glasses more voluminous than predicted. The mixed‐cation glasses in some cases also exhibit more intense colors than anticipated and deviations of the refractive index from additivity. These results are interpreted in terms of slight differences in the mode of network depolymerization which appear to be caused by the polarizing nature of Tl + and Ag +