Structure and properties of a non-traditional glass containing TeO2, SeO2 and MoO3

A glass containing SeO2, TeO2, MoO3 and La2O3 was obtained at high oxygen pressure (P = 36 MPa) using pure oxides as precursors. The real bulk chemical composition of the glass according to LA-ICP-MS analysis is 17SeO2·50TeO2·32MoO3·1La2O3 (wt.%). The glass was characterized by X-ray diffraction, scanning electron microscopy (SEM), differential thermal analysis (DTA), UV–Vis, XPS, IR and EPR spectroscopy. According to DTA the glass transition temperature (Tg) is below 300 °C. By IR and X-ray photoelectron spectroscopy was determined the main building units (TeO3, TeO4, SeO3, Mo2O8) and the existing of mixed bridging bonds only, which build up the amorphous network. It was established by UV–Vis that the glass is transparent above 490 nm. As a result of a lengthy heat treatment, crystallization took place and crystals rich in SeO2 and TeO2 were found incorporated into the amorphous part containing all components.

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► A glass containing SeO2, TeO2, MoO3 and La2O3 was obtained.
► The real chemical composition was verified by LA-ICP-MS.
► By IR and X-ray photoelectron spectroscopy was determined the main building units.
► It was found that mixed bridging bonds only build up the amorphous network.
► By UV–Vis was established that the glass is transparent above 490 nm.