Slavov S.Kashchieva E.Parvanov S.Dimitriev Y.2024-07-162024-07-162024-07-162024-07-162015-01-011314-79781314-7471SCOPUS_ID:84937963089https://rlib.uctm.edu/handle/123456789/1114The paper reports data on glass formation in wider concentration ranges. The samples amorphous nature is characterized by x-ray diffraction analysis, their thermal characteristics and stability are determined by differential thermal analysis (DTA), while the transmission and absorption characteristics outlined are investigated by ultraviolet-visible spectroscopy (UV-Vis). SiO2 content increase leads to a shift of the absorption border to lower wavelengths. The experimental results show that it is possible to obtain low-melting glasses containing 5 mol % - 20 mol % SiO2 and 30 mol % - 63 mol % Bi2O3 with the synthesis technique applied. Substitution of Bi2O3 with Nd2O3 up to 10 mol% leads to the preparation of a complex multicomponent glasses and glass-crystalline materials of high thermal stability.enArticle