1. Structure and magnetic
property of ilmenites &
magnetoplumbites
SUMEET S. CHAVAN
MSC-II, SEM-IV
INORGANIC CHEMISTRY

2. contents
Structure and properties of
ilmenites.
Structure and magnetic
properties of magnetoplumbites.
References.

3. Ilmenites
Weakly magnetic titanium iron-
oxide mineral.
Crystalline iron titanium oxide
(FeTiO3)

4. Structure of ilmenites
 ABO3 type of group
A=Fe,Co,Ni,Cd,Mg
B=Ti,Rh,Mn
 Closely related to corundum, α-
Al2O3
 Symmetry is rhombohedral.

5. Properties of ilmenite.
 Ilmenite crystallizes in the trigonal system. The
ilmenite crystal structure consist of an ordered
derivative of the corundum structure.
 in corundum all cations are identical but in ilmenite
Fe2+ and Ti4+ ions occupy alternating layers
perpendicular to the trigonal C axis.
Containing high spin ferrous centers, ilmenite is
paramagnetic.

6. Magnetoplumbites
Structure
 Magnetoplumbite is mineral
PbFe12O19
 BaM
 Closely related to that of
β-alumina,NaAlO

7. Beta-alumina Magnetoplumbite

8. Magnetic property
• Magnetic structure of BaM is complex.
• Fe ions in 5 different sets of crystallographic
site.
• The net effect is that in formula BaFeO , 8 of
the Fe ions have their spins oriented in 1
direction & remaining 4 are antiparallel , giving
a resultant of 4 Fe ions with a moment of 20
BM .

9. References
Inorganic chemistry by A.R.West