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Structure and Properties of Silver Borate Glasses
Author(s) -
BOULOS E. N.,
KREIDL N. J.
Publication year - 1971
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.1151-2916.1971.tb12324.x
Subject(s) - boron , alkali metal , molar volume , infrared spectroscopy , analytical chemistry (journal) , mineralogy , sodium , materials science , infrared , absorption (acoustics) , crystallization , phase (matter) , chemistry , inorganic chemistry , thermodynamics , metallurgy , optics , composite material , organic chemistry , physics
Clear glasses form in the system Ag 2 O‐B 2 O 3 up to about 35 mol% (65 wt%) Ag 2 O. Infrared absorption, thermal expansion, and density data indicated an analogy to the Na 2 O‐B 2 O 3 system. Pentaborate‐triborate group pairs appear to be formed on addition of Ag 2 O to B 2 O 3 up to 20 mol% Ag 2 O and diborate groups from 20 to 33 mol% Ag 2 O. This interpretation is supported by the comparison of the infrared absorption spectra of quenched and crystallized glasses. One crystallization product, Ag 2 O‐4B 2 O 3 , was identified previously. A new compound starts to appear at 28 mol% Ag 2 O. The theory that silver is generally present as a network modifier like sodium was substantiated by the comparison of the molar volume of sodium and silver borate glasses. Above 27 mol% Ag 2 O some atomic silver is assumed to be present; below 15 mol%, exploratory studies indicate a two‐phase structure within an immiscibility gap. A low‐temperature internal friction peak in the glasses up to 28 mol% Ag 2 O corresponds to the alkali peak in other glasses; a high temperature peak appearing in the 34 mol% Ag 2 O glass is associated with the appearance of nonbridging oxygen in the system.