E_g (eV)

ν₅

ν₄

ν₃

ν₂

ν₁

Nano composites

4.67

2926

1637

1386

1112

576

Zn_0.5mg_0.5Fe₂O₄

4.63

2923

1633

1387

1114

576

Zn_0.5mg_0.4Cu_0.1Fe₂O₄

4.07

2922

1632

1384

1112

576

Zn_0.5mg_0.3Cu_0.2Fe₂O₄

4.29

2921

1630

1382

1116

583

Zn_0.5mg_0.2Cu_0.3Fe₂O₄

4.04

2922

1633

1387

1117

576

Zn_0.5mg_0.1Cu_0.4 Fe₂O₄