Abstract
In this study, oleylamine (OAm) capped FeMn
y
Co
y
Fe
2−2y
O
4
(0.0 ≤ y ≤ 0.4) nanocomposites (NCs) were prepared via the polyol route and the impact of bimetallic Co
3+
and Mn
3+
ions on the structural and magnetic properties of Fe
3
O
4
was investigated. The complete characterization of FeMn
y
Co
y
Fe
2−2y
O
4
@OAm NCs were done by different techniques such as XRD, SEM, TGA, FT-IR, TEM, and VSM. XRD analyses proved the successful formation of mono-phase MnFe
2
O
4
spinel cubic products free from any impurity. The average crystallite sizes were calculated in the range of 9.4–26.4 nm using Sherrer’s formula. Both SEM and TEM results confirmed that products are nanoparticles like structures having spherical morphology with small agglomeration. Ms continued to decrease up to Co
3+
and Mn
3+
content of y = 0.4. Although Mössbauer analysis reveals that the nanocomposites consist three magnetic sextets and superparamagnetic particles are also formed for Fe
3
O
4
, Co
0.2
Mn
0.2
Fe
2.6
O
4
and Co
0.4
Mn
0.4
Fe
2.2
O
4
. Cation distributions calculation was reported that Co
3+
ions prefer to replace Fe
2+
ions on tetrahedral side up to all the concentration while Mn
3+
ions prefer to replace Fe
3+
ions on the octahedral.