| The conventional acid-base concepts in glass are discussed and a new hypothesis
to define basicity of a borate or a silicate glass has been proposed. The role of nonbridging
oxygen in glass is compared with that of hydroxyl ion in aqueous solutions.
Chromium (VI), Vanadium (V), Uranium (VI), Cobalt (II), and Nickel (II) are found
to exist in glass in acidic and basic forms with very different optical absorption; these
ions can successfully be used as colour indicators to study the acid-base character
of a glass. The influence of acid-base property on oxidation-reduction equilibrium of
transition metal ions in glass is discussed. |
