Structure, Glass Stability and Crystallization Activation Energy of SrO-CaO-B2O3-SiO2 glasses doped with TiO2
[EN] By the first time the correlation between glass stability (GS), activation energy for crystallization (E) and structural data was investigated for some TiOdoped CaO-SrO-BO-SiO glasses obtained from the same batch. B NMR spectra demonstrated that the boron changes from tetragonal to trigonal con...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/268920 |
| Acceso en línea: | http://hdl.handle.net/10261/268920 |
| Access Level: | acceso abierto |
| Palabra clave: | silicate glasses crystallization kinetics Glass stability Structure of glass |
| Sumario: | [EN] By the first time the correlation between glass stability (GS), activation energy for crystallization (E) and structural data was investigated for some TiOdoped CaO-SrO-BO-SiO glasses obtained from the same batch. B NMR spectra demonstrated that the boron changes from tetragonal to trigonal configuration for TiO contents higher than 4 mol%, while the Si NMR spectra showed the absence of Q species, in addition to an increase in Q at the expense of Q 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 TiO content. Most of the GS parameters increase with the TiO content, while E decreases for larger TiO contents. This dramatic reduction in E is strongly correlated to the change in the role of Ti cation in the glass matrix. |
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