Abstract
Model cluster calculations by discrete variational-Xα method for the Fe
3+ ions at 8
b and 24
d sites of the In
2O
3 crystal lattice demonstrated that the density of states of the Fe
3+ 3d electrons located around the center of the band gap, and the spin density of states for the Fe
3+ ions at 8
b and 24
d sites are asymmetric. For Fe-doped In
2O
3 powders, we found a cusp at ≈
30 K overlapping cluster glass behavior in dc susceptibility, though the cusp showed no frequency dependence in ac susceptibility. The cusp at ≈
30 K for the Fe-doped In
2O
3 powders can be attributed to superexchange interactions between Fe
3+ ions substituted for In
3+ ions of the In
2O
3 crystal lattice.