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Influence of SiO2 substitution for B2O3 on the properties of borosilicate glasses

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Glass samples with the molecular formula (mol%): (30+x) SiO2–(10–x)B2O3–5Al2O3–54Na2O–1MnO2 where x=0, 5, 7·5 and 10 mol% were prepared. The density, glass forming ability, fragility, Vickers hardness and magnetic susceptibility were measured and the results were used to investigate the changes caused by the replacement of boron oxide by silicon oxide. It was found that the density, glass forming ability, fragility and Vickers hardness at first increase at 5 mol% B2O3 (35 mol% SiO2) and then decrease at 2·5 mol% B2O3 (37·5 mol% SiO2) and increase again with increasing SiO2. The replacement of B2O3 by SiO2 increases the concentration of nonbridging oxygens and changes the ratio between BO4 and BO3. The higher density, glass forming ability and fragility of the sample containing 5 mol% B2O3 is due to the ratio between B2O3 and Al2O3 which equals 1, causing BO3 to change to BO4. The magnetic susceptibility increases as the silicon oxide content increases up to 37·5 mol% and then decreases.
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Document Type: Research Article

Publication date: February 1, 2013

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