Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

Постоянный URI для этого сообществаhttps://cris.qyzpu.kz/handle/123456789/1

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Автор: search.filters.author.Erbolat Ermekovich KuanyshbekovТема: search.filters.subject.electrical conductivity

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    Synthesis and electrophysical characterization of a three-phase Ca–Nd–Mn–Ni–O oxide system
    (Nature Portfolio, 2026-06-25)
    Zhenisgul Imangalievna Sagintaeva
    ;
    Shuga Bulatovna Kasenova
    ;
    Bulat Kunurovich Kasenov
    ;
    Erbolat Ermekovich Kuanyshbekov
    ;
    Aigul Tanirbergenovna Ordabaeva
    The three-phase Ca-Nd-Mn-Ni-O oxide system was synthesized by a conventional solid-state ceramic method. The phase composition was investigated by X-ray diffraction (XRD) analysis using the PDF-5+/Rigaku SmartLab Studio II software package and was further confirmed by Rietveld refinement employing the GSAS-II software suite. According to the WPPF/Rietveld refinement results, the synthesized material predominantly consists of the Nd₀.₂₅Ca₁.₇₅MnO₄ phase (67.2 wt%), together with the perovskite-like Ca₀.₅Nd₀.₅Mn₀.₉₇Ni₀.₀₃O₃ phase (25.6 wt%) and a minor (Ni₀.₉₄Mn₀.₀₆)O phase (7.2 wt%). SEM analysis revealed an agglomerated granular morphology with porous regions, while elemental mapping confirmed the presence of Ca, Nd, Mn, Ni, and O in the synthesized material. FTIR spectroscopy showed characteristic metal-oxygen vibrational bands associated with [MnO₆] and [NiO₆] octahedral units. The electrical properties were investigated in the temperature range of 293-483 K at a frequency of 1 kHz. The material exhibited semiconducting behavior, and the calculated activation energies of electrical conduction were found to be 0.49 and 0.56 eV for the temperature intervals of 293-353 K and 393-483 K, respectively.
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    Structural and Functional Properties of the Oxide System LaCaCuVMnO7.5 and Its Composites with YBa2Cu3Ox
    (Multidisciplinary Digital Publishing Institute, 2026-07-06)
    Zhenisgul Imangalievna Sagintaeva
    ;
    Shuga Bulatovna Kasenova
    ;
    Bulat Kunurovich Kasenov
    ;
    Erbolat Ermekovich Kuanyshbekov
    ;
    Aigul Tanirbergenovna Ordabaeva
    Oxide systems with the nominal composition LaCaCuVMnO7.5 and composites modified with the YBa2Cu3Ox phase were synthesized by the solid-state reaction method. The phase composition and structural features were systematically investigated by X-ray diffraction (XRD), Rietveld refinement, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM–EDX). The parent oxide was found to form a two-phase system, consisting of an orthorhombic perovskite-like phase and a cubic manganite–vanadate phase, whereas the introduction of 10 wt.% YBa2Cu3Ox resulted in the formation of a three-phase composite containing an additional cuprate phase. Thermophysical investigations in the 298–673 K range revealed λ-type-like anomalies in the heat capacity, which may be associated with possible structural or interphase transformations in the investigated oxide systems. The incorporation of YBa2Cu3Ox significantly modified the temperature dependence of heat capacity and increased its values over both low- and high-temperature regions. Electrophysical measurements in the 293–483 K range confirmed the semiconducting nature of conductivity, while the addition of YBa2Cu3Ox reduced electrical resistance and enhanced dielectric permittivity. These findings demonstrate that YBa2Cu3Ox modification provides an effective route for tuning the thermophysical and electrophysical properties of LaCaCuVMnO7.5-based oxide systems, suggesting their potential as promising candidates for multifunctional oxide materials with possible electronic and sensor-related applications.