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<p>Amorphous oxide glasses with compositions (5-<i>x</i>)Li<sub>2</sub>O-5Al<sub>2</sub>O<sub>3</sub>-75B<sub>2</sub>O<sub>3</sub>15MgF<sub>2</sub>-<i>x</i>Gd<sub>2</sub>O<sub>3</sub>where <i>x</i> = 0.0, 0.2, 0.4, and 0.6&#xa0;mol% were synthesized via melt-quenching technique. The structural characterizations of fresh samples are studied using measured XRD and IR spectra. Furthermore, in Gd free sample the deconvoluted IR showed that BO<sub>4</sub> is the dominant. Moreover, at higher doping levels of Gd resulted in an enhancement of the intensity of the transformed BO<sub>4</sub> into BO<sub>3</sub>. The measured dc conductivity showed that the free sample of Gd has the lowest conductivity. As the doping level increased to 0.2&#xa0;mol%, the dc conductivity increased many orders of magnitude This phenomenon is attributed to the high polarizability of Gd<sup>3+</sup> over Li<sup>+</sup>. The present study focused mainly on the correlation between Gd<sup>3+</sup> content and the electrical conductivity behavior. AC conductivity (σ<sub>ac</sub>) was measured at frequencies ranging from 100&#xa0;Hz to 5&#xa0;MHz and temperatures ranging from 293 to 373&#xa0;K. The frequency-dependent data were analyzed using Jonscher’s power law (σ<sub>ac</sub> ∝ ωˢ) and fitted with the Almond-West formalism to extract the frequency exponent (s) and hopping frequency (ω<sub>H</sub>). Among the various conduction models, the Overlapping Large Polaron Tunneling (OLPT) provided the most suitable description of the conduction mechanism. An examination of structural parameters including density, molar volume, average B–B separation, and non-bridging oxygen concentration, was undertaken to elucidate the underlying mechanisms. Introduction of Gd<sup>3+</sup> ions in the structural matrix of LAB contribute to the formation of localized states and enhance ionicity and ionic transport.</p>

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Ion transport and structural modifications in lithium aluminum Borate oxide glass doped with Gd2O3

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Fathy Abdel-Wahab,
  • M. A. Azooz,
  • M. Abdel-baki,
  • Ayman M. Mostafa,
  • A. M. Fayad,
  • Ashraf K. Eessaa,
  • Heba Abdelmaksoud

摘要

Amorphous oxide glasses with compositions (5-x)Li2O-5Al2O3-75B2O315MgF2-xGd2O3where x = 0.0, 0.2, 0.4, and 0.6 mol% were synthesized via melt-quenching technique. The structural characterizations of fresh samples are studied using measured XRD and IR spectra. Furthermore, in Gd free sample the deconvoluted IR showed that BO4 is the dominant. Moreover, at higher doping levels of Gd resulted in an enhancement of the intensity of the transformed BO4 into BO3. The measured dc conductivity showed that the free sample of Gd has the lowest conductivity. As the doping level increased to 0.2 mol%, the dc conductivity increased many orders of magnitude This phenomenon is attributed to the high polarizability of Gd3+ over Li+. The present study focused mainly on the correlation between Gd3+ content and the electrical conductivity behavior. AC conductivity (σac) was measured at frequencies ranging from 100 Hz to 5 MHz and temperatures ranging from 293 to 373 K. The frequency-dependent data were analyzed using Jonscher’s power law (σac ∝ ωˢ) and fitted with the Almond-West formalism to extract the frequency exponent (s) and hopping frequency (ωH). Among the various conduction models, the Overlapping Large Polaron Tunneling (OLPT) provided the most suitable description of the conduction mechanism. An examination of structural parameters including density, molar volume, average B–B separation, and non-bridging oxygen concentration, was undertaken to elucidate the underlying mechanisms. Introduction of Gd3+ ions in the structural matrix of LAB contribute to the formation of localized states and enhance ionicity and ionic transport.