Ricerche su vetri semiconduttori. - I. Indagine vibrazionale Raman e ultrarossa su materiali vetrosi semiconduttori del sistema $As_{2}O_{3}-V_{2}O_{5}-PbO$

Bertoluzza, Alessandro ; Simoni, Rosa ; Monti, Patrizia

Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 55 (1973) no. 5, pp. 477-490

Résumé

Vibrational spectra of binary glassy materials $As_{2}O_{3}-PbO$ (Ramanand u.r.), $V_{2}O_{5}-PbO$ (u.r.) and $As_{2}O_{3}-V_{2}O_{5}$ (u.r.) are reported and discussed. In the case of $As_{2}O_{3}-PbO$ systems, spectra interpretation suggests a modification of $As_{2}O_{3}$ and $V_{2}O_{5}$ structures and the formation of structural centers typical, respectively, of metaarsenites and metavanadates. For these demolitions, the probable mechanisms are proposed. In the case of $As_{2}O_{3}-V_{2}O_{5}$ system (64-30% of $As_{2}O_{3}$), the spectra agree with the ortho-, pyro-, metavanadates formation hypothesis together with a $V_{2}O_{5}$ littLe modification, while for the same system (30-10% of $As_{2}O_{3}$) the spectra are not in disagreement with the supposed presence of $V^{+4}$ species.