Browsing by Author "Kalishenko, Y. R."

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    Properties and Structural Characteristics of Glasses in the SrO–BaO–Al2O3–B2O3–SiO2 System for Dielectric Composite Materials
    (Ukrainian State University of Chemical Technology, Dnipro, 2024) Amelina, O. A.; Zaichuk, Oleksandr V.; Hordeieiv, Y. S.; Filonenko, D. V.; Kalishenko, Y. R.
    ENG: Ceramic materials synthesized within alkali-free aluminosilicate systems are widely used as dielectrics in microelectronics, radio engineering, aviation, and rocket technologies. The addition of glass binders to these ceramic compositions significantly reduces the sintering temperature by promoting liquid phase formation at lower temperatures. This study investigates the effect of substituting SrO with BaO on the properties and structural characteristics of glasses in the SrO–BaO–Al2O3–B2O3–SiO2 system. It is found that replacing up to 20 mol.% of SrO with BaO enhances the glass-forming ability and promotes the formation of monoclinic strontium anorthite during crystallization. Additionally, strontium anorthite forms a solid substitutional solution with celsian due to the close ionic radii of Sr2+ and Ba2+ ions. This similarity in ionic size and charge ensures that the basic structural units of the glass network remain unchanged. Moreover, increasing the BaO content to 20 mol.% reduces the coefficient of thermal expansion of the glass from 78⋅10–7 оС-1 to 71⋅10–7 оС-1, while slightly increasing the density from 3.20 g/cm3 to 3.34 g/cm3. The volumetric electrical resistance at 300 оС ranges between 1010.7 and 1011.6 ohm⋅cm, demonstrating the excellent insulating properties of these experimental glasses. The properties of the investigated glasses allow considering them as components of dielectric composite materials that can significantly intensify sintering processes.