Wydział Chemii

Mirosław Karbowiak

Eugeniusz Zych

J. Hölsä

2003

Journal of Physics-Condensed Matter

15

2169-2181

10.1088/0953-8984/15/13/303

Naukowa

Angielski

Artykuł

Low temperature (7 K) absorption spectra of polycrystalline sintered ceramic Lu₂O₃:Eu³⁺ were recorded between 3950 and 50000 cm⁻¹. There are two different intrinsic Eu³⁺ sites, C₂ and S₆ (C_3i), in this host. A total of 105 crystal-field (CF) energy levels were assigned and fitted to a semiempirical Hamiltonian representing the combined free-ion (FI) and CF interactions for a 4f⁶ ion in the C₂ symmetry site. 10 FI and 14 CF parameters were varied simultaneously in the least square adjustments yielding an rms deviation between the calculated and experimental levels of 15 cm⁻¹. The CF strength parameter, S, obtained from calculated B_q^k parameters is larger for Lu₂O₃ when compared to the Y₂O₃ host, which is in accordance with the smaller ionic radius of the Lu³⁺ ion. The CF splittings of the ⁷F ₁ and ⁵D ₁ levels were also determined experimentally for the Eu³⁺ ion in the centrosymmetric S₆ site and the value of the second-rank B₀² CF parameter was calculated.

https://doi.org/10.1016/10.1088/0953-8984/15/13/303

https://ioppublishing.org/