Publikace detail

Thermodynamic model and high temperature Raman spectra of Na2O-B2O3 glassforming melts

Rok: 2019

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Alloys and Compounds

Název nakladatele: Elsevier Science SA

Místo vydání: Lausanne

Strana od-do: 700-705

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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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