Vibrational study of thermally ion-exchanged sodium aluminoborosilicate glassesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 16 июня 2015 г.
Аннотация:Thermally ion-exchanged M+-for-Na+ (M = K and Ag) aluminoborosilicate glasses were obtained from the glass (SiO2)(60)(B2O3)(10)(Al2O3)(6)(Na2O)(20.2)(ZrO2)(3.7)(Sb2O3)(0.1) (in mol%) and studied by infrared reflectance and micro-Raman spectroscopy. The results of both techniques are consistent with local structural rearrangements induced by ion-exchange below glass transition temperature, T-g, and are expressed for the silicate network by the chemical equilibrium Q(2) + Q(4) double left right arrow 2Q(3) where Q(n) represents a silicate tetrahedron with n bridging oxygen atoms. Replacement of Na+ by K+ was found to shift this equilibrium to the right, while the introduction of Ag+ ions causes the opposite effect. Micro-Raman depth profiling showed that these structural changes occur within a layer whose thickness depends on the type of the guest cation and the conditions of ion-exchange; the thickness is about 50 pm for Ag+ ions exchanged at 340 degrees C for 180 min and about 40 mu m for K+ exchanged at 325 degrees C for 6 h. (C) 2013 Elsevier B.V. All rights reserved.