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Journal of Materials Science

, Volume 41, Issue 7, pp 2045–2053 | Cite as

EPR and optical absorption studies of Cr3+ ions in alkaline earth alumino borate glasses

  • V. Ramesh Kumar
  • J. Lakshmana Rao
  • N. O. Gopal
Article

Abstract

Electron paramagnetic resonance (EPR) and optical absorption spectra of Cr3+ ions in Calcium alumino borate (CaAB) glasses have been studied. The EPR spectra exhibit weak resonance signal at g ≈ 4.50 and intense resonance signal at g ≈ 1.98. A sharp resonance signal at g ≈ 1.97 was also observed at lower concentrations of chromium. The concentration dependence of the linewidth of the resonance signal at g ≈ 1.98 suggests the formation of Cr3+ ion clusters by magnetic superexchange interactions. The temperature dependence of the peak to peak intensity and the linewidth of the resonance signal at g ≈ 1.98 suggests that the exchange interactions between Cr3+ ions in the present sample were antiferromagnetic in nature with Néel temperature, TN = 233 K. From the number of spins participating in the resonance at g ≈ 1.98, the paramagnetic susceptibility (χ) was calculated at different temperatures (233–295 K). A plot of 1/χ and T was found to obey Curie-Weiss law with negative Curie temperature. By measuring the relative intensities of the resonance signal at g ≈ 1.98, at different temperatures, the value of antiferromagnetic coupling constant (J) has been estimated. The optical absorption spectrum of chromium doped CaAB glass exhibits four bands, characteristic of Cr3+ ions, in nearly octahedral symmetry. From the band positions, the crystal field splitting parameter, Dq and the Racah interelectronic repulsion parameters, B and C were evaluated. The optical band gap (Eopt) and the Urbach energy (ΔE) were calculated from the ultraviolet absorption edges.

Keywords

Electron Paramagnetic Resonance Electron Paramagnetic Resonance Spectrum Optical Absorption Spectrum Resonance Signal Borate Glass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • V. Ramesh Kumar
    • 1
  • J. Lakshmana Rao
    • 1
  • N. O. Gopal
    • 1
  1. 1.Department of PhysicsSri Venkateswara UniversityTirupatiIndia

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