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Abstract <p>The aim of this work was to prepare and characterize the compound Y<sub>2</sub>Fe<sub>4/3</sub>W<sub>2/3</sub>O<sub>7</sub> and pyrochlore-like solid solutions in the Y<sub>2</sub>O<sub>3</sub>–Fe<sub>2</sub>O<sub>3</sub>–Ta<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub> system. The Y<sub>2</sub>Fe<sub>4/3</sub>W<sub>2/3</sub>O<sub>7</sub> preparation method was developed based on the citrate process. The compound was found to have a pyrochlore-like layered structure described by space group <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(R\bar {3}\)</EquationSource> <!--InrgChem2560287Egorysheva-m1--> </InlineEquation>. Heat capacity measurements showed that Y<sub>2</sub>Fe<sub>4/3</sub>W<sub>2/3</sub>O<sub>7</sub>, unlike Y<sub>2</sub>FeTaO<sub>7</sub>, does not have polymorphic transitions over the entire temperature range from 25 to 1460°C. The <i>x</i>Y<sub>2</sub>FeTaO–(1–<i>x</i>)Y<sub>2</sub>Fe<sub>4/3</sub>W<sub>2/3</sub>O<sub>7</sub> continuous solid solutions and limited <i>x</i>Y<sub>1.85</sub>Fe<sub>1.15</sub>TaO<sub>7</sub>‒(1‒<i>x</i>)Y<sub>2</sub>Fe<sub>4/3</sub>W<sub>2/3</sub>O<sub>7</sub> solid solutions, where <i>x</i> = 0.7–1, were shown to exist. The Y<sub>2<i>x</i></sub>Fe<sub>4/3+<i>x</i></sub>&#xa0;W<sub>2/3</sub>O<sub>7</sub> solid solution was not realized. The IR and Raman spectra of the prepared solid solutions were considered. The absorption edge positions were determined.</p>

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Pyrochlore-Like Solid Solutions in the Y2O3–Fe2O3–Ta2O5–WO3 System

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • A. V. Egorysheva,
  • E. F. Popova,
  • V. S. Omelyanyuk,
  • O. G. Ellert,
  • S. Y. Kottsov,
  • E. S. Kulikova

摘要

Abstract

The aim of this work was to prepare and characterize the compound Y2Fe4/3W2/3O7 and pyrochlore-like solid solutions in the Y2O3–Fe2O3–Ta2O5–WO3 system. The Y2Fe4/3W2/3O7 preparation method was developed based on the citrate process. The compound was found to have a pyrochlore-like layered structure described by space group \(R\bar {3}\) . Heat capacity measurements showed that Y2Fe4/3W2/3O7, unlike Y2FeTaO7, does not have polymorphic transitions over the entire temperature range from 25 to 1460°C. The xY2FeTaO–(1–x)Y2Fe4/3W2/3O7 continuous solid solutions and limited xY1.85Fe1.15TaO7‒(1‒x)Y2Fe4/3W2/3O7 solid solutions, where x = 0.7–1, were shown to exist. The Y2xFe4/3+x W2/3O7 solid solution was not realized. The IR and Raman spectra of the prepared solid solutions were considered. The absorption edge positions were determined.