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<p>In present study, Lithium borate glasses modified with iron oxide (FLB) having compositions xFe<sub>2</sub>O<sub>3</sub>.(40-x)B<sub>2</sub>O<sub>3</sub>.60Li<sub>2</sub>O (where <i>x</i> = 0, 1, 2, 3, 4, 5, and 6&#xa0;mol%) have been synthesized via melt quench technique. Differential Scanning Calorimetry (DSC) characterization was employed to examine the thermal behaviour of FLB glasses. The glass transition temperature of the series decreases from 413 to 391℃ as the ferric oxide concentration increases. The amorphous nature of the FLB series is confirmed by the X-Ray Diffraction (XRD) patterns. To gain insight into the physical properties of FLB glasses, variables like density, molar volume, Oxygen packing density, molar volume of boron, average separation of boron-boron atom, Fe ion concentration, interionic distance and field strength have been calculated. Density values (2.387—2.493&#xa0;g/cc) and Molar volume values (19.180–20.527&#xa0;mol/cc) increase as the concentration of Fe<sub>2</sub>O<sub>3</sub> increases. FTIR and Raman spectroscopic analyses indicated a progressive increase in the number of non-bridging oxygen (NBO) atoms with increasing Fe content. The optical attributes like refractive index, optical band gap (E<sub>g</sub>), Molar refractivity, Urbach energy (E<sub>u</sub>), etc., have been studied using UV–Visible spectroscopy. E<sub>g</sub> values decrease from 2.706 to 1.021&#xa0;eV and E<sub>u</sub> values increases from 0.309 to 0.597&#xa0;eV with increasing Fe<sub>2</sub>O<sub>3</sub> content. The third-order non-linear susceptibility (0.283–5.964 esu), electronic polarizability (2.657–3.514 Å<sup>3</sup>), optical basicity (1.041–1.195), exhibited a progressive increase with increasing Fe content, indicating the enhancement of the optical properties of the glass system. These tunable optical properties highlight the potential of these glasses for photonic and optoelectronic applications.</p>

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Unravelling the influence of ferric oxide on the structural, thermal, and optical properties of lithium borate glasses

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Jyoti Rana,
  • Anil Ohlan,
  • Sajjan Dahiya,
  • S. Murugavel,
  • R. Punia

摘要

In present study, Lithium borate glasses modified with iron oxide (FLB) having compositions xFe2O3.(40-x)B2O3.60Li2O (where x = 0, 1, 2, 3, 4, 5, and 6 mol%) have been synthesized via melt quench technique. Differential Scanning Calorimetry (DSC) characterization was employed to examine the thermal behaviour of FLB glasses. The glass transition temperature of the series decreases from 413 to 391℃ as the ferric oxide concentration increases. The amorphous nature of the FLB series is confirmed by the X-Ray Diffraction (XRD) patterns. To gain insight into the physical properties of FLB glasses, variables like density, molar volume, Oxygen packing density, molar volume of boron, average separation of boron-boron atom, Fe ion concentration, interionic distance and field strength have been calculated. Density values (2.387—2.493 g/cc) and Molar volume values (19.180–20.527 mol/cc) increase as the concentration of Fe2O3 increases. FTIR and Raman spectroscopic analyses indicated a progressive increase in the number of non-bridging oxygen (NBO) atoms with increasing Fe content. The optical attributes like refractive index, optical band gap (Eg), Molar refractivity, Urbach energy (Eu), etc., have been studied using UV–Visible spectroscopy. Eg values decrease from 2.706 to 1.021 eV and Eu values increases from 0.309 to 0.597 eV with increasing Fe2O3 content. The third-order non-linear susceptibility (0.283–5.964 esu), electronic polarizability (2.657–3.514 Å3), optical basicity (1.041–1.195), exhibited a progressive increase with increasing Fe content, indicating the enhancement of the optical properties of the glass system. These tunable optical properties highlight the potential of these glasses for photonic and optoelectronic applications.