Abstract
K2NiF4-like crystals A2MX4 with the space group I4/mmm are interesting in their low symmetry properties due to two-dimensional structure composed of AX and MX3 layers. The SHS analysis is useful to identify the magnetic impurity centers with low symmetry. This chapter reports the results of electron paramagnetic resonance (EPR) measurements on Cr3+ centres formed in K2MgCl4 at room temperature. EPR measurements have been made at room temperature on K2MgCl4 crystals doped with chromium. Spectrum observed has been analyzed by direct diagonalization method of spin-Hamiltonian matrix. Ligand octahedra in the uncompensated Cr 3+ centre are compressed tetragonally along the c axis although those in the pure matrix are elongated. By the use of the spin-Hamiltonian separation analysis, other low-symmetry centers are ascribed to the Cr3+ ions associated with the nearest Mg2+ vacancy, the nearest K+ vacancy and the next nearest K+ vacancy.
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