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Abstract <p>Ferrotellurite with a composition of LuCaFeTeO<sub>6</sub> has been synthesized by ceramic technology from oxides Lu<sub>2</sub>O<sub>3</sub> (special purity grade), TeO<sub>2</sub> (reagent grade), Fe<sub>2</sub>O<sub>3</sub>, and calcium carbonate (analytical grade). The compound was identified X-ray diffractometry. The type of the crystal system, unit cell parameters, and X-ray and pycnometric densities were determined for the compound. The isobaric heat capacity of tellurite was studied by dynamic calorimetry in the temperature range of 298.15–673 K. The equations of the <i>C</i><sub><i>p</i></sub>(<i>T</i>) dependence were derived based on these data. The temperature dependences of the thermodynamic functions <i>S</i>°(<i>T</i>), <i>H</i>°(<i>T</i>) – <i>H</i>°(298.15), Ф<sup><i>хх</i></sup>(<i>Т</i>), and the heat capacity <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6134_Article_IEq1.gif" Format="GIF" Height="24" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\(C_{p}^{^\circ }\)</EquationSource> <!--PhysChA2570002Rustembekov-m1--> </InlineEquation>(<i>T</i>) were calculated.</p>

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Synthesis, X-ray Diffraction, and Thermodynamic Properties of Ferrotellurite LuCaFeTeO6

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • K. T. Rustembekov,
  • A. A. Toibek,
  • S. Zh. Davrenbekov

摘要

Abstract

Ferrotellurite with a composition of LuCaFeTeO6 has been synthesized by ceramic technology from oxides Lu2O3 (special purity grade), TeO2 (reagent grade), Fe2O3, and calcium carbonate (analytical grade). The compound was identified X-ray diffractometry. The type of the crystal system, unit cell parameters, and X-ray and pycnometric densities were determined for the compound. The isobaric heat capacity of tellurite was studied by dynamic calorimetry in the temperature range of 298.15–673 K. The equations of the Cp(T) dependence were derived based on these data. The temperature dependences of the thermodynamic functions S°(T), H°(T) – H°(298.15), Фхх(Т), and the heat capacity \(C_{p}^{^\circ }\) (T) were calculated.