Browsing by Author "Jivov B."

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    Structure and Electrochemical Performance of Glasses in the Li2O-B2O3-V2O5-MoO3 System
    (2025-09-01) Milanova M.; Yang X.; Vargas P.; Rosero-Navarro N.C.; Harizanova R.; Jivov B.; Aleksandrov L.; Iordanova R.; Shopska M.; Koleva S.
    Applying the melt quenching method (cooling rate 101–102 K/s), new multicomponent vanadate glasses were synthesized, containing different amounts of MoO3 at the expense of B2O3 with the composition 20Li2O:(30 − x)B2O3:50V2O5:xMoO3, x = 10, 20 mol%. The obtained samples were characterized by X-ray diffraction, infrared spectroscopy, differential scanning calorimetry and impedance spectroscopy. The density of the glasses was measured by the Archimedes method, on the basis of which the physicochemical parameters molar volume, oxygen molar volume and oxygen packing density were calculated. It was found that the replacement of B2O3 with MoO3 leads to changes in electrical conductivity, which are a consequence of the increase in non-bridging oxygen atoms in the amorphous structure. The electrochemical characterization of the 20Li2O:(30 − x)B2O3:50V2O5:20MoO3 glass obtained was performed by assembling an all-solid-state cell, employing 20Li2O:(30 − x)B2O3:50V2O5:20MoO3 glass as a cathode active material. The obtained results show that the studied glass compositions are interesting in view of their potential application as cathode materials in all-solid-state lithium-ion batteries.
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    TECHNOLOGICAL APPROACH FOR PRODUCTION OF SILICATE INSULATING MATERIALS AND PANELS FOR THE DECORATIVE CLADDING OF BUILDINGS
    (2023-01-01) Toncheva K.; Jivov B.; Lakov L.; Staneva A.
    A conceptual model of an industrial unit for experimental application in a production environment of a technology approach developed in laboratory conditions for the production of various silicate composite materials has been developed. The separate production sections specialized for the implementation of different stages of the technological process and the necessary standard and innovative technical equipment are considered. The specific characteristics of the various products and the existing potential opportunities for their application in different areas of construction are analyzed. The presented technological methodology allows efficient utilization of waste silicate raw materials and cost-effective production of various thermal insulation materials and colored decorative panels for cladding buildings.