Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 13, Pages 18433-18440Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.03.112
Keywords
Niobium oxide; Aluminoborosilicate; Glass network structure
Categories
Funding
- Coordination of Superior Level Staff Improvement (CAPES)
- CAPES-Eletronuclear project [81/2013]
- Sao Paulo Research Foundation (FAPESP) [1999/01924-2, 2000/02483-9]
- National Council for Scientific and Technological Development (CNPq) [481260/2012, 312135/2016-5]
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The effect of adding niobia to borosilicate glasses was studied. It was found that niobium can integrate into the glass structure, causing changes in thermal and structural properties, and also reducing the viscosity of the glass melt.
The addition of small amounts of niobia (Nb2O5) in borosilicate glasses was explored. By analysis on thermal and structural changes, we found evidences that niobium integrates the glass structure in octahedral NbO6 coordination. Adding up to 8.0 mol% of Nb2O5, the oxide partially ruptured the glass structure, interfering in the BO3/BO4 ratio, but the predominant network configuration was maintained. Thermally, there was an increase in the processing interval and the glasses became more resistant against crystallization, with the presence of niobia. Also, the oxide contributed to a notable decrease in the viscosity of the melts. The improvement of such properties were obtained by the controlled dispersion of the oxide in the glass network structure, avoiding large areas of phase-to-phase separation to preserve the desired ability of these glasses to incorporate a wide range of elements.
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