Structural and thermal influence of niobia in aluminoborosilicate glasses

Autor(es)

Costa-silva, D. L. ; Bartolome, J. F. ; Silva, A. C. ; Mello-Castanho, S.

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 48, n. 13, p. 8-pg., 2022-05-26.

Resumo

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. (AU)

• Processo FAPESP: 00/02483-9 - Implantação da técnica de espectroscopia de absorção na região do infravermelho no Departamento de Engenharia de Materiais do IPEN/CNEN-SP
• Beneficiário: Sonia Regina Homem de Mello Castanho
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 99/01924-2 - Obtencao de materiais ceramicos incorporados com rejeitos solidos galvanicos.
• Beneficiário: Sonia Regina Homem de Mello Castanho
• Modalidade de apoio: Auxílio à Pesquisa - Regular