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<p>Lithium–potassium–borate (LKB) glass was prepared by varying the concentrations of Cr<sup>3+</sup> dopant using the meltquenching technique. Further, UV-visible absorption, EPR, and FTIR spectroscopy processes were carried out on the prepared samples. Evaluations were also conducted on a wide range of physical parameters. Nonlinear variations in physical parameters were observed for different glasses, indicating Mixed Alkali Effect (MAE). Various optical parameters, including Urbach energy and optical band gap were derived from the optical absorption data. Data from optical absorption were used to evaluate the crystal field and Racah parameters. The calculated bonding parameters suggest a covalent nature. The EPR spectrum of LKB glass doped with Cr<sup>3+</sup> demonstrates significant signals that are characteristic of Cr<sup>3+</sup> ions in distorted octahedral symmetry. The FTIR spectrum conveys trigonal BO<sub>3</sub> and tetrahedral BO<sub>4</sub> structural components that exist in the glass material.</p>

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Mixed Alkali Effect in Cr3+-doped Li2O–K2O–B2O3 Glasses: Spectroscopic Investigations

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • G. Srinivasa Rao,
  • J. Kishore Babu,
  • K. Vagdevi,
  • Kishor Palle,
  • R. Vijay,
  • L. Vijayalakshmi,
  • Jiseok Lim,
  • R. V. S. S. N. Ravikumar

摘要

Lithium–potassium–borate (LKB) glass was prepared by varying the concentrations of Cr3+ dopant using the meltquenching technique. Further, UV-visible absorption, EPR, and FTIR spectroscopy processes were carried out on the prepared samples. Evaluations were also conducted on a wide range of physical parameters. Nonlinear variations in physical parameters were observed for different glasses, indicating Mixed Alkali Effect (MAE). Various optical parameters, including Urbach energy and optical band gap were derived from the optical absorption data. Data from optical absorption were used to evaluate the crystal field and Racah parameters. The calculated bonding parameters suggest a covalent nature. The EPR spectrum of LKB glass doped with Cr3+ demonstrates significant signals that are characteristic of Cr3+ ions in distorted octahedral symmetry. The FTIR spectrum conveys trigonal BO3 and tetrahedral BO4 structural components that exist in the glass material.