The structure of glasses of the binary system CaO-P 2 O 5 was investigated by the comparison of the results of the thermodynamic model of Shakhmatkin and Vedishcheva constructed using the molar Gibbs energies obtained from the FACT database with the results obtained by the analysis of Raman spectra of xCaOÁ(100 -x)P 2 O 5 (x = 35, 40, 45, 50, 55) glasses performed by the principal component analysis (PCA) method and spectral decomposition by the method of Malfait. The PCA method identified three independent components in the studied spectral series. On the other hand, the thermodynamic modeling resulted in three components with significant abundance in the studied glasses, i.e., P 2 O 5 , CaP 2 O 6 , and Ca 2 P 2 O 7 . Using the method of Malfait, partial Raman spectra of P 2 O 5 , CaP 2 O 6 , and Ca 2 P 2 O 7 were calculated. The experimental spectra were reproduced with very good accuracy. The multivariate curve resolution (MCR) method was used for the analysis of the experimental spectra. It was found that MCR loadings are practically identical with the partial Raman spectra obtained from the results of thermodynamic model by the method of Malfait. All the obtained results confirmed the structural information acquired from the thermodynamic model.
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