کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1809518 | 1525197 | 2014 | 4 صفحه PDF | دانلود رایگان |
• The tetragonal field parameters are associated with the local structures of the impurity V4+ center.
• Ligand contributions are taken into account from the cluster approach.
• EPR and optical spectra are analyzed for the impurity V4+ center in the MPPH crystal.
The optical absorption and electron paramagnetic resonance (EPR) parameters (g factors g||, g⊥ and hyperfine structure constants A||, A⊥) of a tetragonal V4+ center in MgKPO4·6H2O (MPPH) crystal are theoretically investigated using the perturbation formulas for a 3d1 ion in tetragonally compressed octahedra. In these formulas, the contributions from the s- and p-orbitals as well as the spin–orbit coupling coefficient of the O2− ligand are taken into account based on the cluster approach. The calculated results are in good agreement with the observed values. The local structure parameters of the [VO6]8− cluster are obtained from the calculation. The magnitudes of the metal–ligand distances parallel and perpendicular to the C4-axis are, respectively, R||≈1.846 Å and R⊥≈2.032 Å. The validity of the calculated results has also been discussed.
Journal: Physica B: Condensed Matter - Volume 449, 15 September 2014, Pages 225–228