Abstract
An electron paramagnetic resonance (EPR) study of Cu2+ ions doped in zinc ammonium phosphate hexahydrate (ZAPH) (ZnNH4PO4·6H2O) single crystals at liquid nitrogen temperature (77 K) is reported here. EPR spectra are fitted to a spin Hamiltonian of orthorhombic symmetry with parameters of Cu2+: site I, gx=2.1135, gy=2.2216, gz=2.3937 (±0.0002) and Ax=37, Ay=47, Az=70 (±2×10−4 cm−1); site II, gx=2.0845, gy=2.1995, gz=2.3777 (±0.0002) and Ax=39, Ay=48, Az=73 (±2×10−4 cm−1). Copper enters the lattice substitutionally at two magnetically inequivalent sites. The ground state wave function of the Cu2+ ion in this lattice is determined to be predominantly |x2−y2⟩. The optical absorption spectra of the Cu2+ ion doped in ZAPH single crystals at room temperature are also recorded and the bands observed are assigned. Finally, from the optical and EPR data, the nature of the bonding in the complex is discussed.
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