Thermodynamic model and high temperature Raman spectra of Na2O-B2O3 glassforming melts
| Autor: | Roman Svoboda, Armenak A. Osipov, Leyla M. Osipova, Branislav Hruška, Mária Chromčíková, Marek Liška |
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| Rok vydání: | 2019 |
| Předmět: |
Imagination
Materials science Chemical substance media_common.quotation_subject Analytical chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention symbols.namesake Magazine law Materials Chemistry media_common Component (thermodynamics) Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology Decomposition 0104 chemical sciences Thermodynamic model Mechanics of Materials Principal component analysis symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Alloys and Compounds. 798:700-705 |
| ISSN: | 0925-8388 |
| Popis: | The set of 33 baseline subtracted and thermally corrected Raman spectra of xNa2O•(1-x)B2O3 (x = 0.10, 0.15, 0.20, 0.25, 0.30, 0.40, and 0.50) glassforming melts measured at temperatures ranging from 501 °C to 1145 °C was analyzed. The real error estimated by Principal Component Analysis indicated 3–4 independent components. The Multivariate Curve Analysis (MCR) performed for three components resulted in the Raman spectra (so called loadings) and relative abundances (so called scores) of each component. The thermodynamic model of Shakhmatkin and Vedishcheva (SVTDM) was evaluated for each studied melt. Ten following system components were considered: Na2O, B2O3, 3Na2O·B2O3 (N3B), 2Na2O·B2O3 (N2B), Na2O·B2O3 (NB), Na2O·2B2O3 (NB2), Na2O·3B2O3 (NB3), Na2O·4B2O3 (NB4), Na2O·5B2O3 (NB5), and Na2O·9B2O3 (NB9). The Malfait's spectral decomposition was performed considering the equilibrium molar amounts of the components with highest abundance, i.e. B, NB, and NB4. The obtained partial Raman spectra were compared with the loadings obtained by MCR. The acceptable coincidence was found. The MCR adjusted scores were close to the SVTDM equilibrium molar amounts of system components considered in the Malfait's decomposition. The obtained results validate the correctness of the SVTDM. |
| Databáze: | OpenAIRE |
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