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Opis bibliograficzny

Autorzy (4)

• AGHŁagowska Barbara
• AGHWacławska Irena
• AGHSitarz Maciej
• AGHSzumera Magdalena

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Dane bibliometryczne

ID BaDAP	114553
Data dodania do BaDAP	2018-06-20
Tekst źródłowy	URL
DOI	10.1016/j.molstruc.2018.05.085
Rok publikacji	2018
Typ publikacji	artykuł w czasopiśmie
Otwarty dostęp
Czasopismo/seria	Journal of Molecular Structure

Abstract

Glass, in its various forms, represents one of the largest single outlet for boron products. Boron is a powerful glass component and also confers high chemical resistance for glasses in general. As a component it works by reducing melting point, viscosity, thermal expansion coefficient, and increasing transparency and brightness, and even heat resistance of the glass. Almost every time the use of boron improves fluxing capabilities of a batch, reduces glass batch melting temperature and also reduces the tendency of glass to crystallization. These specific properties arise from a structural role played by boron in the glass structure. Boron is a network former and is fully integrated to the glass structure in the form of different structural units, in which its coordination can be either three-fold and/or four-fold. Its role and influence on the glass structure is well known. It mainly concerns borosilicate and borophosphate glass, which contains two types of network formers i.e. SiO2 and P2O5. Due to the lack of literature data about glass additionally containing B2O3 in its composition, the structural features of boron in silicate-borate-phosphate glass are reviewed. The different boron-containing units and spectroscopic techniques (X-ray method, Raman and FTIR spectroscopy) used to identify them are described. Glasses from a SiO2P2O5K2OCaOMgO system modified by B2O3 addition were analysed. Using spectroscopic methods it was found that the analysed glass samples contained triangular and tetrahedral boron groups along with SiO and PO vibrations. The structural studies indicate the coexistence of BO3 and BO4 structural groups but only in the case of higher content of B2O3 in the glass chemical composition (above 12 mol%). The existence of SiOSi, POP and BOSi vibrations was also confirmed. In summary, it is concluded that the increasing content of B2O3 in the structure of glass from SiO2B2O3P2O5K2OMgOCaO system results in gradual increase of degree of silicate-borate-phosphate framework polymerization.

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