Optical and Magneto-Optical Properties of Na₀.₃₇₅Tb₀.₆₂₅F₂.₂₅ Crystal

doi:10.26565/2312-4334-2026-2-16

M.E. Malysheva National university of Uzbekistan, Tashkent, Uzbekistan https://orcid.org/0000-0002-4626-7398
R.R. Vildanov National university of Uzbekistan, Tashkent, Uzbekistan https://orcid.org/0000-0001-5334-9909
T. Akhmadjanov National university of Uzbekistan, Tashkent, Uzbekistan https://orcid.org/0000-0002-6484-1226
V.O. Pelenovich Institute of Technological Sciences of Wuhan University, Wuhan, China https://orcid.org/0000-0001-8663-3543
F.K. Turotov National university of Uzbekistan, Tashkent, Uzbekistan https://orcid.org/0000-0001-9008-4815
O.Z. Sultonov National university of Uzbekistan, Tashkent, Uzbekistan https://orcid.org/0000-0002-1375-3955
S.R. Reymbaeva National university of Uzbekistan, Tashkent, Uzbekistan https://orcid.org/0009-0003-5684-3509

DOI: https://doi.org/10.26565/2312-4334-2026-2-16

Keywords: Fluoride crystals, Rare-earth ions, Magneto-optical properties, Luminescence, Energy levels, Magnetic circular polarization, Verdet constant

Abstract

Optical and magneto-optical spectra of the Na_0.375Tb_0.625F_2.25crystal have been studied within the ultraviolet and visible spectral range. It has been established that within the wavelength range of 535-560 nm there is an intense luminescence band caused by intra-configurational 4f→4f transitions ⁵D₄→⁷F₅. In the luminescence band ⁵D₄→⁷F₅and ⁵D₄→⁷F₄the radiative 4f→4f transitions have been identified and it has been established that the magnetic dipole transitions dominate in the secondary emission spectra. Analysis of magneto-optical research data has demonstrated that the C-term of magneto-optical activity plays a significant role in the mechanism of occurrence of magneto-optical effects on luminescence bands caused by “forbidden” 4f→4f transitions. A comparative analysis of the dispersion dependence of the Verdet constant of the Na_0.375Tb_0.625F_2.25single crystal showed that it is about 90% of the Verdet constant of the well known Tb₃Ga₅O₁₂ crystal, which demonstrates a good magneto-optical properties of the new synthesized crystal.

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