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<p>Rare earth (RE) element Dy doped K<sub>0.<i>5</i></sub>Na<sub>0.5</sub>NbO<sub>3</sub> (Dy<sub><i>x</i></sub>(K<sub>0.5</sub>Na<sub>0.5</sub>)<sub>1-<i>x</i></sub>NbO<sub>3</sub>) perovskites were synthesized through solid-state reaction method. X-ray diffraction peak profile confirmed phase purity and the crystalline orthorhombic structure of the prepared samples, belonging to the Amm2 space group. The frequency dispersion was exhibited by dielectric constant (ε′) attributed to Maxwell Wagner Space charge polarization. The Dy-KNN1 sample demonstrated the highest dielectric constant (ε´⁓2250 at 100&#xa0;Hz frequency, at 400&#xa0;°C temperature) compared to all other prepared samples. Tangent loss (tan δ) also shows similar dispersion to that observed for dielectric constant. The ac conductivity exposed an upward trend with increasing frequency and temperature. The ac conductivity lies within the range of 10<sup>− 3</sup>(Sm<sup>-1</sup>) of prepared samples. The results of E<sub>a</sub> suggest that conductivity property can be attributed to presence of oxygen vacancies. The energy band gap of the samples ranged from 3.15 to 3.47&#xa0;eV. highlighting their potential for applications in energy conversion and sensing.</p>

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Tailoring dielectric and electrical conductivity in dy-doped K0.5Na0.5NbO3 ceramics: insights into rare Earth ion modified lead-free perovskites

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Pooja Dahiya,
  • Riya Malik,
  • Parveen Yadav,
  • Ashima Hooda,
  • Satish Khasa

摘要

Rare earth (RE) element Dy doped K0.5Na0.5NbO3 (Dyx(K0.5Na0.5)1-xNbO3) perovskites were synthesized through solid-state reaction method. X-ray diffraction peak profile confirmed phase purity and the crystalline orthorhombic structure of the prepared samples, belonging to the Amm2 space group. The frequency dispersion was exhibited by dielectric constant (ε′) attributed to Maxwell Wagner Space charge polarization. The Dy-KNN1 sample demonstrated the highest dielectric constant (ε´⁓2250 at 100 Hz frequency, at 400 °C temperature) compared to all other prepared samples. Tangent loss (tan δ) also shows similar dispersion to that observed for dielectric constant. The ac conductivity exposed an upward trend with increasing frequency and temperature. The ac conductivity lies within the range of 10− 3(Sm-1) of prepared samples. The results of Ea suggest that conductivity property can be attributed to presence of oxygen vacancies. The energy band gap of the samples ranged from 3.15 to 3.47 eV. highlighting their potential for applications in energy conversion and sensing.