Abstract
By analyzing the EPR parameters D and ( a− F) of Fe 3+ ion located at octahedral site in yttrium gallium garnet, the local lattice structure around Fe 3+ ion in the crystal has been investigated on the basis of the complete energy matrices for a d 5 configuration ion in a trigonal ligand field. It is shown that there exists a slight expansion distortion in the local lattice structure and the distortion is different at 4.2 and 295 K. This result may be attributed to the fact that the radius of Fe 3+ ion is larger than that of Ga 3+ ion, and the Fe 3+ ion will push the two oxygen triangles to move upwards and downwards, respectively, along C 3-axis when the temperature decreases. From EPR calculation, the local lattice structure parameters R = 2.0068 Å, θ = 51.4691 ° at 295 K and R = 2.010 Å, θ = 51.3706 ° at 4.2 K for octahedral Fe 3+ centre in yttrium gallium garnet are determined.
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