Scholarlink

<p>Co-doping glass matrices with two rare-earth (RE) ions is an effective strategy for tailoring and enhancing their electrical and dielectric properties. In the present work, a Pr<sup>3+</sup>/Ce<sup>3+</sup> co-doped sodium zinc phosphate glass was successfully synthesized using a conventional melt-quenching technique. The investigated glass has the nominal composition 50P<sub>2</sub>O<sub>5</sub>–20ZnO–29Na<sub>2</sub>O–0.5Pr<sub>2</sub>O<sub>3</sub>–0.5Ce<sub>2</sub>O<sub>3</sub> (mol%), corresponding to a total rare-earth oxide content of 1&#xa0;mol% introduced in an equimolar Pr<sup>3+</sup>/Ce<sup>3+</sup> ratio. The electrical transport properties were systematically analyzed, and the corresponding activation energies were determined. Dielectric relaxation processes were investigated through electric modulus analysis, providing insight into the relaxation dynamics over a wide range of frequencies and temperature. The results show that the dc conductivity follows Arrhenius behavior, while the ac conductivity obeys Jonscher’s universal power law, indicating thermally activated charge transport dominated by hopping mechanisms. A low apparent activation energy was observed for the investigated co-doped glass, suggesting the presence of energetically favorable transport pathways. At 393&#xa0;K, the electrical conductivity reaches 6.4 × 10<sup>–6</sup> (Ω&#xa0;m)<sup>−1</sup>, with a low activation energy of 0.16&#xa0;eV. The dielectric constant exhibits strong frequency and temperature dependence, reflecting pronounced polarization effects. Electric modulus analysis reveals temperature-dependent relaxation dynamics and confirms non-Debye relaxation behavior. The imaginary part of the electric modulus was successfully fitted using the Bergman-modified Kohlrausch–Williams–Watts (KWW) function, indicating a broad distribution of relaxation times in the co-doped glass.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mixed-cation (Pr3+/Ce3+) effects on the electrical and dielectric properties of sodium zinc phosphate glass

  • 期刊论文

  • 发表日期：

    2026年7月20日

查看全文
  • Kharroubi Mohamed

摘要

Co-doping glass matrices with two rare-earth (RE) ions is an effective strategy for tailoring and enhancing their electrical and dielectric properties. In the present work, a Pr3+/Ce3+ co-doped sodium zinc phosphate glass was successfully synthesized using a conventional melt-quenching technique. The investigated glass has the nominal composition 50P2O5–20ZnO–29Na2O–0.5Pr2O3–0.5Ce2O3 (mol%), corresponding to a total rare-earth oxide content of 1 mol% introduced in an equimolar Pr3+/Ce3+ ratio. The electrical transport properties were systematically analyzed, and the corresponding activation energies were determined. Dielectric relaxation processes were investigated through electric modulus analysis, providing insight into the relaxation dynamics over a wide range of frequencies and temperature. The results show that the dc conductivity follows Arrhenius behavior, while the ac conductivity obeys Jonscher’s universal power law, indicating thermally activated charge transport dominated by hopping mechanisms. A low apparent activation energy was observed for the investigated co-doped glass, suggesting the presence of energetically favorable transport pathways. At 393 K, the electrical conductivity reaches 6.4 × 10–6 (Ω m)−1, with a low activation energy of 0.16 eV. The dielectric constant exhibits strong frequency and temperature dependence, reflecting pronounced polarization effects. Electric modulus analysis reveals temperature-dependent relaxation dynamics and confirms non-Debye relaxation behavior. The imaginary part of the electric modulus was successfully fitted using the Bergman-modified Kohlrausch–Williams–Watts (KWW) function, indicating a broad distribution of relaxation times in the co-doped glass.