Structure, Glass Stability and Crystallization Activation Energy of SrO-CaO-B2O3-SiO2 glasses doped with TiO2

Autor(es)

Alencar, Maria V. S. ^[1] ; Bezerra, Glauco V. P. ^[1] ; Silva, Lais D. ^[2] ; Schneider, Jose F. ^{[3, 2]} ; Jesus Pascual, M. ^[4] ; Cabral, Aluisio A. ^{[1, 5]}

Afiliação do(s) autor(es)

^[1] Fed Inst Maranhao IFMA, Postgrad Program Mat Engn, BR-65030001 Sao Luis, Maranhao - Brazil

^[2] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, Postgrad Program Mat Sci & Engn PPGCEM, Ctr Res Technol & Educ Vitreous Mat CeRTEV, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil

^[4] CSIC, Inst Ceram & Vidrio, C Kelsen 5, Campus Cantoblanco, Madrid 28049 - Spain

^[5] Fed Inst Maranhao IFMA, Dept Phys DEFIS, BR-65030001 Sao Luis, Maranhao - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Non-Crystalline Solids; v. 554, FEB 15 2021.
• Citações Web of Science: 0

Resumo

By the first time the correlation between glass stability (GS), activation energy for crystallization (E-c) and structural data was investigated for some TiO(2)doped CaO-SrO-B2O3-SiO2 glasses obtained from the same batch. B-11 NMR spectra demonstrated that the boron changes from tetragonal to trigonal configuration for TiO2 contents higher than 4 mol%, while the Si-29 NMR spectra showed the absence of Q(4) species, in addition to an increase in Q(2) at the expense of Q(3) units. Both observations are consistent with Ti acting as a network modifier. It was demonstrated that all these glasses crystallize mainly from the surface, and the crystal growth changes with the TiO2 content. Most of the GS parameters increase with the TiO2 content, while E-c decreases for larger TiO2 contents. This dramatic reduction in E-c is strongly correlated to the change in the role of Ti cation in the glass matrix. (AU)

• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs