CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF PSEUDOBROOKITE Fe2-xNixTiO5 SYSTEM (x = 0, 0.1, 0.2, 0.3, 0.5 AND 1)

CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF
PSEUDOBROOKITE Fe
2-x
Ni
x
TiO
5
SYSTEM (x = 0, 0.1, 0.2, 0.3, 0.5 AND 1). Crystallographic structure
and magnetic properties of pseudobrookite Fe
2-x
Ni
x
TiO
5
system (x = 0, 0.1, 0.2, 0.3, 0.5 and 1) have been
performed through solid state reaction. Pseudobrookite Fe
2-x
Ni
x
TiO
5
system was synthesized by mixing of
Fe
2
O
3
, NiO, and TiO
2
with stoichiometry composition using wet mill. The mixture was milled for 5 hours and
sintered in the electric chamber furnace at 1000
o
C in the air at atmosphere pressure for 5 hours. The refinement
against of X-ray diffraction data shows that the sampless with composition of (x = 0) and (x = 0.1) have a single
phase with Fe
2
TiO
5
structure. However the samples with composition of (x > 0.1) consist of multiple phases,
namely Fe
2-x
Ni
x
TiO
5
, FeTiO
3
, Fe
2
NiO
4
and NiO. Particle morphologies of the composition x = 0 and x = 0.1 are
homogenous and uniform on the sample surface with a polygonal particle shape and particle size varies. At
room temperature, the sample with x=0 is paramagnetic and that with x=0.1 is ferromagnetic. Magnetic phase
transformation of this study is the caused by the present of Ni substituted Fe in the system. Thus substitution
Ni into Fe on the system pseudobrookite Fe
2
TiO
5
only capable of 0.1 at.% without changing the crystal
structure of the material. It means that there is an interaction between the magnetic spin Fe
3+
on the 3d
5
configurations and Ni
2+
on the 3d
3
configurations through the mechanism of double exchange. Double exchange
mechanism is a magnetic type of exchange that appears between the ions Fe
3+
and Ni
2+
adjacent in different
oxidation states