University of Chemical Technology and Metallurgy

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Browsing University of Chemical Technology and Metallurgy by Author "Abdel-Rehim W.M.F."

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    STRUCTURE, THERMAL, AND PHYSIC-CHEMICAL PROPERTIES OF SOME CHALCOGENIDE ALLOYS
    (2023-01-01) Adam A.M.; Abdel-Rehim W.M.F.; Petkov P.; El-Qahtani Z.M.H.; Alqannas H.S.; Alruqi A.B.; Hakamy A.; Ataalla M.
    Bulk products of crystalline Bi2Se3-xTex alloys (x =0.0, 0.1, 0.3, 0.5) were pre-pared using simple melting synthesis. Crystalline features, microstructure, and surface morphologies of the synthesized samples were examined via X-ray dif-fraction, scanning electron microscope, and energy dispersive X-ray spectrome-ter. Elemental distribution was studied by energy dispersive analysis of X-ray spectroscopy. Polycrystalline of rhombohedral crystal structure was observed for the concerned samples. Perfect crystallinity and micro-scalability of the prepared were also reflected by the physic-chemical properties of each sample. Thermal behavior was studied throughout differential scanning calorimetry and thermo-gravimetric analysis showing that the samples are of high stability over high temperature range. Physic-chemical properties were determined in terms of ex-perimental density. These properties were compactness value, molar volume and the percentage of free volume. Density of Bi2Se3 alloy was obtained at 7.37 gm/cm3. The Te doping enhanced the density of the Bi2Se3-xTex system. The most Te doped alloy showed density of 9.018 gm/cm3. All other physic-chemical prop-erties showed strong dependence on the Tea amounts in the system.