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Abstract <p>Nickelite-manganite with a composition of NdLi<sub>2</sub>NiMnO<sub>5</sub> has been synthesized by solid-phase interaction of oxides Nd<sub>2</sub>O<sub>3</sub>, NiO, Mn<sub>2</sub>O<sub>3</sub>, and Li<sub>2</sub>CO<sub>3</sub> in the range of 600–1250°C. As shown by X-ray diffraction methods, this compound crystallizes in the cubic crystal system. The temperature dependence of heat capacity was studied by experimental calorimetry in the range of 298.15–673 K, and it was revealed that on the <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6297_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\({C}_{p}^\circ \)</EquationSource> <!--PhysChA2570191Kasenov-m1--> </InlineEquation> <i>~ f</i>(<i>T</i>) curve the compound has anomalous abrupt changes in the heat capacity at 348 and 423 K, probably related to second-order phase transitions. The standard entropy was calculated. The thermodynamic functions <i>S</i>°(<i>T</i>), <i>H</i>°(<i>T</i>) <i>– H</i>°(298.15), and Φ<sup><i>xx</i></sup>(<i>T</i>) were calculated in the range of 298.15–675 K<i>.</i> The temperature dependences of electric capacity, electric resistance, and permittivity were studied in the range of 293–483 K, and it was established that NdLi<sub>2</sub>NiMnO<sub>5</sub> has hole conductivity at 293–363 and 423–483&#xa0;K and metallic conductivity at 363–423 K.</p>

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Thermodynamic and Electrophysical Properties of New Neodymium and Lithium Nickelite-Manganite NdLi2NiMnO5

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • B. K. Kasenov,
  • Zh. I. Sagintaeva,
  • Sh. B. Kasenova,
  • E. E. Kuanyshbekov,
  • A. Nukhuly,
  • A. A. Mukhtar

摘要

Abstract

Nickelite-manganite with a composition of NdLi2NiMnO5 has been synthesized by solid-phase interaction of oxides Nd2O3, NiO, Mn2O3, and Li2CO3 in the range of 600–1250°C. As shown by X-ray diffraction methods, this compound crystallizes in the cubic crystal system. The temperature dependence of heat capacity was studied by experimental calorimetry in the range of 298.15–673 K, and it was revealed that on the \({C}_{p}^\circ \) ~ f(T) curve the compound has anomalous abrupt changes in the heat capacity at 348 and 423 K, probably related to second-order phase transitions. The standard entropy was calculated. The thermodynamic functions S°(T), H°(T) – H°(298.15), and Φxx(T) were calculated in the range of 298.15–675 K. The temperature dependences of electric capacity, electric resistance, and permittivity were studied in the range of 293–483 K, and it was established that NdLi2NiMnO5 has hole conductivity at 293–363 and 423–483 K and metallic conductivity at 363–423 K.