Medium-range order and physicochemical properties of (100 − x)(0.5PbO · 0.5P2O5) · xTeO2 glasses in terms of the constant stoichiometry grouping concept

• Published in: Glass physics and chemistry Vol. 36; no. 6; pp. 637 - 651
• Main Authors: Apakova, I. E., Goncharuk, V. K., Maslennikova, I. G., Polyakova, I. G., Anan’ev, A. V., Maksimov, L. V., Markova, T. S., Yanush, O. V.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.12.2010; Springer Nature B.V
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Glass; Materials Science; Natural Materials; Physical Chemistry; Raman spectra; constant stoichiometry groupings in glasses
• ISSN: 1087-6596; 1608-313X
• DOI: 10.1134/S1087659610060015

Glasses in the (100 − x )(0.5PbO · 0.5P 2 O 5 ) · x TeO 2 section of the PbO-P 2 O 5 -TeO 2 system have been synthesized over the entire composition range for the first time and their properties (Raman spectra, refractive index n , density d , glass transition temperature T g , and light scattering losses) have been investigated. It has been demonstrated that the Raman spectra can be represented as a superposition of constant spectral forms corresponding to constant stoichiometry groupings PbO · P 2 O 5 , TeO 2 · 2PbO · 2P 2 O 5 , TeO 2 · PbO · P 2 O 5 , 2TeO 2 · PbO · P 2 O 5 , and TeO 2 . The existence of crystals of the corresponding stoichiometry has been predicted using the constant stoichiometry grouping concept. The diagram of the constant stoichiometry grouping contents (determined from the Raman spectra) in glasses of the system under investigation has made it possible to determine the partial properties of constant stoichiometry groupings, to calculate the dependences of the refractive index and density on the composition, and to refine the values of n and d for vitreous tellurium dioxide and lead metaphosphate. The practical importance of glasses in the system under consideration for the use in photonic devices has been discussed.