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Glasses of composition xAsO-NaO and xAsO-KO have been prepared and Raman and i.r. spectra studied in relation to the vitreous AsO spectra, previously examined. In glasses richer in AsO, structural centers of vitreous AsO-namely of the claudetitic type-are present together with centers, typical of alkaline metaarsenite structure, which increase as the alkaline oxide percentage increases. Differently from vitreous AsO, which, in time, modifies its structure passing from a claudetitic type to an arsenolitic...
U.r. spectra of NaHPO - 2HO samples at room temperature and after heating at 175,235 and 370 °C, are reported. At these temperatures thermogravimetric analysis indicates the loss of 2, 1/2 and 1/2 water molecules, respectively. U.r. spectra agree with NaHPO formula for the salt heated at 175 °C, with NaHPO for that heated at 235 °C and with NaPO for that heated at 370 °C. Bands corresponding to typical vibrations are discussed for each species. Particularly, in the case of NaPO, u.r. spectra makes...
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