Browsing by Author "Slavov S.S."

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    Determination of the sensing characteristics of SiO2-Bi2O3-TiO2 system towards relative humidity
    (2018-01-01) Afify A.S.; Slavov S.S.; Mahmoud A.E.R.; Hassan M.; Ataalla M.; Staneva A.; Mohamed A.
    The aim of the present study is to determine the relative humidity (RH) sensing characteristics of the glass and glasscrystalline materials based on SiO2-Bi2O3-TiO2 system prepared by the melt quenching and controlled glass crystallization methods. Sensors were obtained by screen-printing of the prepared compositions onto alumina substrates with Pt electrodes. The sensors were tested in the range (0.0 - 96%) of the relative humidity at room temperature. The results have shown that most of the obtained glass ceramic materials had a lower sensitivity towards RH. The composition 20SiO2.30Bi2O3.50TiO2 has possessed the highest permittivity value (3000 F.m-1) and the lowest value of dielectric loss (0.0002) at room temperature which make it a promising candidate for some industrial applications such as energy storage, electronic capacitors as well as memory devices.
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    Structure and dielectric behaviour of glasses in the TeO2-BaO-V2O5system
    (2021-02-16) Tasheva T.R.; Slavov S.S.
    The rapid development of telecommunication and information technology aims to design and investigate new functional materials. Glasses in the TeO2-BaO-V2O5 seems to be promising materials within this purpose. In this connection the structure and dielectric properties of the glasses have been studied. Small polaron hopping of V4+ to V5+ ion in the vanadate chains and the influence of BaO and TeO2 on the dielectric permittivity, dielectric losses and frequency depended conductivity of the glasses measured at room temperature in the frequency range from 100 Hz to 1 MHz have been discussed.