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Thermodynamic model and high temperature Raman spectra of Na2O-B2O3 glassforming melts
Authors: Chromcikova Maria | Osipov Armenak A. | Osipova Leyla M. | Hruska Branislav | Liska Marek | Svoboda Roman
Year: 2019
Type of publication: článek v odborném periodiku
Name of source: Journal of Alloys and Compounds
Publisher name: Elsevier Science SA
Place: Lausanne
Page from-to: 700-705
Titles:
Language Name Abstract Keywords
cze Termodynamický model a vysokoteplotní Ramanova spektra Na2O-B2O3 sklotvorných tavenin Vysokoteplotní Ramanova spektra pro sklotvorné taveniny Na2O-B2O3 s obsahem Na2O 10 až 50 molárních procent byla změřena a analyzována ve spojení s termodynamickým modelem SVTDM. borátová skla; Ramanova spektra; termodynamický model; MCR
eng Thermodynamic model and high temperature Raman spectra of Na2O-B2O3 glassforming melts The set of 33 baseline subtracted and thermally corrected Raman spectra of xNa(2)O center dot(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 degrees C to 1145 degrees 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, 3Na(2)O center dot B2O3 (N3B), 2Na(2)O center dot B2O3 (N2B), Na2O center dot B2O3 (NB), Na2O center dot 2B(2)O(3) (NB2), Na2O center dot 3B(2)O(3) (NB3), Na2O center dot 4B(2)O(3) (NB4), Na2O center dot 5B(2)O(3) (NB5), and Na2O center dot 9B(2)O(3) (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. (C) 2019 Elsevier B.V. All rights reserved. Borate glass melts; Raman spectra; Thermodynamic model; MCR

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