AN EPR STUDY OF MANGANESE(II) COMPLEXES IN POTASSIUM CHROMATE SINGLE-CRYSTAL

Electron paramagnetic resonance study of Mn2+-doped K2CrO4 single crys tals at room temperature and liquid nitrogen temperature revealed the presence of two pairs of inequivalent Mn2+ complexes. It is concluded that Mn2+ ions are incorporated in the host substitutionally at potass ium sites, and an equal number of K+ vacancies are created for charge compensation. The spin-Hamiltonian parameters are evaluated. The princ ipal directions of the crystalline field experienced by the manganese (II) ion are determined and they are found to be consistent with the e lectrostatic considerations. The hyperfine parameters indicate the sig nificant extent of covalent bonding of ligands with the metal ion.