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<p>In this report, we have performed frequency dependent dielectric study of Sr<sub>2</sub>RuMn<sub>1−x</sub>Fe<sub>x</sub>O<sub>6</sub> (0 ≤ x ≤ 0.4) double perovskite materials synthesized by conventional solid-state route. The initial two samples of the series (x = 0 and 0.1) crystallized in tetragonal structure with space group P4/mmm and last two samples (x = 0.2 and 0.3) crystallized in cubic structure with Pm-3 space group. The frequency dependent dielectric studies of the compounds reveal colossal dielectric constant (~ 10<sup>7</sup>) at different temperatures. The dielectric constant of all the samples maintains a constant value up to 500&#xa0;kHz. The dielectric behavior of all the compounds is best interpreted using Maxwell–Wagner interfacial polarization model. The Cole–Cole model was used to study the dielectric relaxation of the samples which indicated a polydispersive nature of the dielectric relaxation. The temperature variation of mean relaxation time (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\tau\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>τ</mi> </math></EquationSource> </InlineEquation>) follows Arrhenius law with activation energy in the range of 0.013–0.152&#xa0;eV.</p>

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Evidence of colossal dielectric constant in ruthenium double perovskite oxide Sr2RuMn1−xFexO6 (0 ≤ x ≤ 0.4)

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Sipun Mohanty,
  • Sibasish Mandal,
  • Akshay Prajapati,
  • Samrat Mukherjee

摘要

In this report, we have performed frequency dependent dielectric study of Sr2RuMn1−xFexO6 (0 ≤ x ≤ 0.4) double perovskite materials synthesized by conventional solid-state route. The initial two samples of the series (x = 0 and 0.1) crystallized in tetragonal structure with space group P4/mmm and last two samples (x = 0.2 and 0.3) crystallized in cubic structure with Pm-3 space group. The frequency dependent dielectric studies of the compounds reveal colossal dielectric constant (~ 107) at different temperatures. The dielectric constant of all the samples maintains a constant value up to 500 kHz. The dielectric behavior of all the compounds is best interpreted using Maxwell–Wagner interfacial polarization model. The Cole–Cole model was used to study the dielectric relaxation of the samples which indicated a polydispersive nature of the dielectric relaxation. The temperature variation of mean relaxation time ( \(\tau\) τ ) follows Arrhenius law with activation energy in the range of 0.013–0.152 eV.