Metal Oxides with spinel structures
- P.Y.53 (Ni/Sb/Ti-Oxide)
- P.Br.24 (Cr/Sb/Ti-Oxide)
- P.Y.164 (Mn/Sb/Ti-Oxide)
- P.O.82 (Sn/Ti/Zn-Oxide)
- P.B.28 (Co/Al-Oxide)
- P.G.50 (Co/Ti/Ni/Zn-Oxide)
- P.Br.29 (Cr/Fe-Oxide)
- P.Y.119 (Zn/Fe-Oxide)
- P.Bk. 27 (Co/Cr/Fe/Mn-Oxide)