Bertoluzza, Morelli Bertoluzza, Fagnano: Indagine vibrazionale Raman e ultrarossa di vetri polifosfati sodici: sale di Graham e vetri oligofosfati

Bertoluzza, Alessandro and Morelli Bertoluzza, Maria Antonietta and Fagnano, Concezio:
Indagine vibrazionale Raman e ultrarossa di vetri polifosfati sodici: sale di Graham e vetri oligofosfati
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Serie 8 54 (1973), fasc. n.6, p. 944-956, (Italian)
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Raman Laser and I.R. spectra of vitreous (NaPO₃)_x (Graham's salt), crystalline ((NaPO₃)_x (Maddrell's salt), crystalline sodium trimetaphosphate Na₃P₃O₉ and vitreous sodium olygophosphates with molar ratios Na₂O/P₂O₅ between 1 and 1.625 are here reported. By comparison of Graham's salt spectra with those of Maddrell's salt and trimetaphosphate, it is possible to confirm, for Graham's salt, the polyphosphatic linear chain structure. Evidence is shown for the analogy between the I.R. and Raman spectra of vitreous (NaPO₃)_x and crystalline (RbPO₃)_x. An increase of the molar ratio Na₂O/P₂O₅ in the vitreous olygophosphates causes a demolition of the polyphosphatic chain which is shown in I.R. and Raman spectra when the Na₂O/P₂O₅ratio is $\ge 1.250$.

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Referenze Bibliografiche