Scholarlink

<p>This study presents Cr<sup>3+</sup>-doped 70B<sub>2</sub>O<sub>3</sub>+(30-x)Li<sub>2</sub>O+xCr(NO<sub>3</sub>)<sub>3</sub>.9H<sub>2</sub>O glasses prepared via melt-quenching to assess the influence of Cr<sup>3+</sup> concentration (0–1 mol%) on their structure, microstructure, optical, and electrochemical properties. The glasses exhibit a change in colour from transparent to deep green as Cr<sup>3+</sup> increases, indicating successful doping and improved visible-light absorption. XRD confirms amorphous structure, while Raman shows shifts in metal-oxygen vibrations from 324 to 372 cm<sup>−1</sup>, indicating stronger Cr<sup>3+</sup>-O<sup>2−</sup> bonds and more NBOs, leading to higher thermal stability (T<sub>g</sub> increased from 408 °C to 428 °C). Optical spectra display a redshift and a broad <i>d-d</i> transition ~600 nm. The band gap narrows from 3.13 eV to 2.11 eV with Cr<sup>3+</sup> doping, representing an approximate 32.6% decrease. Urbach energy varies non-linearly, suggesting changes in disorder. Electrochemical tests show improved charge storage and redox reversibility, with 1 mol% Cr<sup>3+</sup>-doped glass (LBCr1.0) exhibiting low charge-transfer resistance (~6.8 Ω) and high capacitance (57.2 Fg<sup>−1</sup> at 0.5 mA), indicating efficient ion transport and stability for photonic and energy storage applications.</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

Enhanced thermal stability, visible-light absorption, band gap narrowing and electrochemical performance of Cr3⁺-doped lithium borate glasses

  • 期刊论文

  • 发表日期：

    2025年12月19日

查看全文
  • Areej S. Alqarni,
  • N. Srinatha,
  • Yashwanth V. Naik,
  • M. B. Karthik Kumar,
  • P. R. Kousalya,
  • A. Madhu

摘要

This study presents Cr3+-doped 70B2O3+(30-x)Li2O+xCr(NO3)3.9H2O glasses prepared via melt-quenching to assess the influence of Cr3+ concentration (0–1 mol%) on their structure, microstructure, optical, and electrochemical properties. The glasses exhibit a change in colour from transparent to deep green as Cr3+ increases, indicating successful doping and improved visible-light absorption. XRD confirms amorphous structure, while Raman shows shifts in metal-oxygen vibrations from 324 to 372 cm−1, indicating stronger Cr3+-O2− bonds and more NBOs, leading to higher thermal stability (Tg increased from 408 °C to 428 °C). Optical spectra display a redshift and a broad d-d transition ~600 nm. The band gap narrows from 3.13 eV to 2.11 eV with Cr3+ doping, representing an approximate 32.6% decrease. Urbach energy varies non-linearly, suggesting changes in disorder. Electrochemical tests show improved charge storage and redox reversibility, with 1 mol% Cr3+-doped glass (LBCr1.0) exhibiting low charge-transfer resistance (~6.8 Ω) and high capacitance (57.2 Fg−1 at 0.5 mA), indicating efficient ion transport and stability for photonic and energy storage applications.