Some Properties of Glasses in the System Barium Oxide–Boric Oxide–Silica

Abstract

Glasses in the System Barium Oxide-Boric Oxide-Silica 209havior of clear and opaque plates subjected to the same heattreatment. V. SummaryA method has been developed for calculating temperature It distributions in glass plates undergoing heat-treatment.has been programmed for a high-speed digital computer and is ready for application to practical problems of glass technology. the differences, both qualitative and quantitative, in the be- Acknow,edgmenhAcknowledgment is made to E. R. Michalik, formerly of Mellon Institute and now with the Pittsburgh Plate Glass Company, and to Carl Saalbach of the Westinghouse Electric Corporation for programming the high-speed digital computer. Densities, refractive indices, liquidus temperatures, and primary phases of glass compositions in the glassforming region of the system BaO-BtOrSiOz were determined. Anomalous changesin properties were observed for a continuous change in composition. The possibility that there is a relation between the compounds indicated by the phase diagram and the actual units in the glass is suggested.

Barium borosilicate glass – a potential matrix for immobilization of sulfate bearing high-level radioactive liquid waste

“…Before selecting the base glass compositions, relevant ternary phase diagrams i.e. BaO-B 2 O 3 -SiO 2 , Na 2 O-B 2 O 3 -SiO 2 , BaO-Na 2 O-SiO 2 have been studied [9][10][11]. Data related to the glass forming regions were collected for each of these systems.…”

Relaxation process of the 4I13/2 level of Er3+ in a borosilicate glass

“…4, and the highest phonon energy is 1415 cm À1 , which is due to the stretched vibration of [BO 4 ]. Since the total content of the modifiers is much higher than B 2 O 3 , boron would exist in the form of [BO 4 ] [23]. It connects non-bridging oxygens arising from the glass modifiers, and converts them into bridging oxygens.…”

Properties of zinc borosilicate glasses

“…The m elts we re made in platinum crucibles and stirred with platinum-l0 p ercen t-rhodium propeller-typ e stirrers. Th e details of th e melting procedure are published elsewher e [5,6]. rrhe sag points (accurate to ± 7° C) [7] of th e glasses were used to establish annealing temperat.ures from which the glasses wer e cooled at 2.5° C per hour to 350° C .…”

“…In a sear ch for heat-r esistan t glasses, for which a low coefficient of t h ermal expansion is desirable, it was found that Winklemann [1] 2 reported a low, expansion zinc borate glass containing 4] percent of B20 3 and 59 per cen t of ZnO by weigh t. H e r epor ted a coeffi cient of cub ic expansion of 110 X lO-i over the temperature range of 10.35 to 92.88° C, whi ch is eq uivalent to a coefficient of linear expansion of 3.7 X l0- 6 . The glass h as b een r eported to h ave other extrem e properti es including great hardness, large values of clastic modu l i, and Poisso n's r atio [1, p. 193].…”