Theoretical studies of the EPR parameters and local structures for Ni3+ and Cu2+ centers in MgNH4PO4·6H2O

The electron paramagnetic resonance (EPR) parameters of the impurity Ni3+ (and Cu2+) in MgNH4PO4·6H2O (MAPH) are theoretically studied from the perturbation formulas for 3d7 (and 3d9) ions under or...