Double spin-glass-like behavior and antiferromagnetic superexchange interaction between Fe3+ ions in α-Ga2− xFe xO3 (0 ≤ x ≤ 0.4) |
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Lv Yi-Fei†, Xiang Jian-Yong†
 , Wen Fu-Sheng, Lv Wei-Ming, Hu Wen-Tao, Liu Zhong-Yuan |
| Diffuse reflectance spectra of α -Ga2− x Fe x O3 with x = 0, 0.1, 0.2, 0.3, and 0.4. (a) The Kubelka–Munk function F ( R ), which is proportional to the absorption coefficient, converts from the relative diffuse reflectance spectra R . The downside arrows denote definition of the bandgap at the absorption edge E g (edge). The vertical lines show the position of two absorption peaks corresponding to the d-d transition of octahedrally coordinated Fe3+ ions. (b) Optical bandgap E g and E g (edge) as a function of Fe3+ content. Inset is the Tauc plot of ( F ( R )× hν )2 versus hν showing the definition of the E g. The solid lines guide the eyes. |
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