The origin of the unusual DSC peaks of supercooled barium disilicate liquid
| Autor: | T.R. Cunha, Alisson Mendes Rodrigues, Edgar Dutra Zanotto, D.V. Sampaio, Laís D. Silva, Paulo S. Pizani, Benjamin J.A. Moulton |
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| Rok vydání: | 2019 |
| Předmět: |
Exothermic reaction
Materials science Rietveld refinement Analytical chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences law.invention Amorphous solid symbols.namesake Differential scanning calorimetry law Phase (matter) symbols General Materials Science Crystallization 0210 nano-technology Glass transition Raman spectroscopy |
| Zdroj: | CrystEngComm. 21:2768-2778 |
| ISSN: | 1466-8033 |
| Popis: | It is known that barium disilicate (BS2) glass exhibits two prominent exothermic peaks between the glass transition and melting temperatures in calorimetric experiments, however, their cause is not known. In this work, glass-ceramic samples were produced inside a differential scanning calorimeter (DSC) and then investigated ex situ with X-ray diffraction (XRD) and Raman spectroscopy. We found that the first exothermic peak results from multiphase crystallization although a signature of residual glass is still observed. H-BaSi2O5, and Ba3Si5O13 were directly identified after the first exothermic peak, however, both L-BaSi2O5 and an unknown phase(s) are also formed. Rietveld analysis indicates |
| Databáze: | OpenAIRE |
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