Crystal field parameters in USiO4 from temperature dependence of paramagnetic susceptibility

Based on the experimentally determined temperature dependence of the paramagnetic susceptibility of tetragonal USiO₄ within the temperature range 2–500°K, the crystal field parameters of D_2d symmetry have been estimated (in cm^?1): B⁰₂ = ?24, B⁰₄ = ?1.25, B⁴₄ = ?12.8, B⁰₆ = ?0.031, B⁴₆ = 0.51, and $\text{B}{}^4{}_4\text{B}{}^4{}_6\text{≈ ?25}$. The Γ₅ doublet with the approximate composition: 0.78|±1> + 0.63|?3> is the ground level of the U⁴⁺ ion. Singlet Γ₁ lying ca. 100 cm^?1 above is the first excited level. The total splitting of the ³H₄ term of the U⁴⁺ ion was estimated to be equal to ca. 7500 cm^?1.