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<p>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&#xa0;K at a frequency of 1&#xa0;kHz. The material exhibited semiconducting behavior, and the calculated activation energies of electrical conduction were found to be 0.49 and 0.56&#xa0;eV for the temperature intervals of 293–353&#xa0;K and 393–483&#xa0;K, respectively.</p>

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Synthesis and electrophysical characterization of a three-phase Ca–Nd–Mn–Ni–O oxide system

  • 期刊论文

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  • 发表日期：

    2026年6月25日

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  • Zhenisgul Sagintaeva,
  • Shuga Kasenova,
  • Bulat Kasenov,
  • Erbolat Kuanyshbekov,
  • Aigul Ordabaeva,
  • Zhanar Tursinova

摘要

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.