Abstract
The ESR powder spectra of both pure K3CrO8 and of K3NbO8, containing small amounts of K3CrO8, have been obtained. The spectra have yielded the values: g∥=1.9434, g‖=1.9848, for the two spin Hamiltonian parameters of chromium in the +5 oxidation state. It has been shown that the g factors can only be explained by assuming the ground state to be B1(dxy). Further, the optical spectrum of K3CrO8 in 30% H2O2 has been obtained and the single observed band at 20 000 cm—1, has been assigned to the B1→E transition. Both the ESR and the optical spectra indicate a strong degree of covalent character in the bond between the chromium atom and the peroxide ions.
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