ACTA

EPR Spectroscopy of the Mn²⁺ and Cu²⁺ Centres in Lithium and Potassium-Lithium Tetraborate Glasses

B.V. Padlyak^a,b, W. Wojtowicz^b, V.T. Adamiv^a, Ya.V. Burak^a and I.M. Teslyuk^a
^aInstitute of Physical Optics, 23 Dragomanov Str., 79-005 Lviv, Ukraine
^bInstitute of Physics, University of Zielona Góra, 4a Szafrana Str., 65-516 Zielona Góra, Poland

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The electron paramagnetic resonance spectra of the glasses with Li₂B₄O₇ and KLiB₄O₇ compositions doped with Mn and Cu were investigated. On the basis of obtained EPR spectra analysis it was shown that the Mn and Cu impurities are incorporated into the glass network as Mn²⁺ (⁶S_5/2, 3d⁵) and Cu²⁺ (²D_5/2, 3d⁹) ions. The Mn²⁺ EPR spectra in the glasses with Li₂B₄O₇ and KLiB₄O₇ compositions are characterised by the following parameters, measured at T = 300 K: isotropic g-factor (g_iso = 2.00 ± 0.05), isotropic hyperfine constant (A_iso = (8.65 ± 0.05) mT) and peak-to-peak linewidth of hyperfine components ΔB_pp = (3.50 ± 0.05) mT. The Cu²⁺ EPR spectra in the glasses with Li₂B₄O₇ and KLiB₄O₇ compositions, registered at T = 300 K are characterised by the same g-values (g_∥ = 2.34 ± 0.05, g_⊥ = 2.06 ± 0.05) and peak-to-peak line width of hyperfine components (ΔB_pp^∥ = (5.11 ± 0.05) mT, ΔB_pp^⊥ = (1.80 ± 0.05) mT), whereas anisotropic hyperfine constants show some differences (A_∥ = (14.28 ± 0.05) mT, A_⊥ = (2.34 ± 0.05) mT for glass with Li₂B₄O₇ composition and A_∥ = (14.21 ± 0.05) mT, A_⊥ = (2.55 ± 0.05) mT for glass with KLiB₄O₇ composition). The possible local structure of the Mn²⁺ and Cu²⁺ centres in the lithium and potassium-lithium tetraborate glass network has been considered.

DOI: 10.12693/APhysPolA.117.122
PACS numbers: 76.30.Fc, 81.05.Kf