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An X-band EPR study on a Na_3(CrMo_6O_(24)H_6)·8H_2O single crystal diluted by its isomor-phic compound Na_3(AlMo_6O_(24)H_6)·8H_2O at room temperature is reported. Using the least squares-fitting method to simulate the EPR data for principal planes, the Hamiltonian parameterswere obtained. The principal values of the g tensors are g_(ZZ) = 1.904, g_(XX)= 1.973, g_(YY)=1.933. The zero field splitting tensor parameters are D = 0.275 cm~(-1), E = 0.05 cm~(-1). The fielddependence of Cr~(3+) energy levels with field at different angles from the principal axes whenthe field is along the principal planes is calculated based on these experimental parameters.The isofrequency plots of calculated field vs. angle are also shown. They agree well with theexperimental results.
An X-band EPR study on a Na_3 (CrMo_6O_ (24) H_6) · 8H_2O single crystal diluted by its isomor-phic compound Na_3 (AlMo_6O_ (24) H_6) · 8H_2O at room temperature is reported. The principal values of the g tensors are g_ (ZZ) = 1.904, g_ (XX) = 1.973, g_ (YY) = 1.933. The zero field splitting tensor parameters are D = 0.275 cm -1, E = 0.05 cm -1. The field dependence of Cr 3 + energy levels with field at different angles from the principal axes whenthe field is along the principal planes is calculated based on these experimental parameters. The isofrequency plots of calculated field vs. angle are also shown. Both agree well with the experimental result.