摘要:
The electron paramagnetic resonance (EPR) technique has been used to study the Mn2+ paramagnetic impurity complexes in synthetic struvite (MgNH4PO4.6H2O) and the zinc isomorph (ZnNH4PO4.6H2O). EPR of VO2+ ion complexes in vanadyl doped crystals of the zinc isomorph of struvite has also been studied. Two differently oriented, but otherwise identical complexes of both Mn2+ ion and VO2+ ion are found in these crystals. The spin Hamiltonian parameters indicate a large orthorhombic distortion of the [Mn2+(H2O)6] octahedra and an axial symmetry of the vanadyl complexes. The results indicate that in both manganese and vanadyl complexes, the metal ions have covalent bonding with the ligands.