Abstract:The electron paramagnetic resonance (EPR) parameters for K
2Zn(SO
4)
2·6H
2O:Cu
2+, i.e.
gfactors (
g
x,
g
y,
g
z) and hyperfine structure constants (
A
x,
A
y,
A
z), are theoretically investigated by using the high-order perturbation formulas of these parameters for Cu
2+in orthorhombically elongated octahedra. Based on the calculation, the Cu
2+-H
2O bond-lengths of theCu(H
2O)
6
2+cluster in K
2Zn(SO
4)
2·6H
2O crystal are found to be
R
x≈ 0.197 nm,
R
y≈ 0.213 nm,
R
z≈ 0.224 nm, and the mixing coefficients of the ground state wave function parameters are
α≈ 0.978 and
β≈ 0.209, respectively. The calculated EPR parameters show a good agreement with the experimental data.