Mechanically induced cation redistribution in magnesium ferrite and its thermal stability

Synthesis of nanocrystalline Cd–Zn ferrite by ball milling and its stability at elevated temperatures

“…It can be seen from the plot that the lattice parameter of ferrite phase formed after 1 h of milling reduces rapidly within 3 h of milling from the value 0.859 nm to ∼0.849 nm ( Table 1) and then remained almost invariant up to 25 h of milling. It is a well known fact that the distribution of cations among the tetrahedral and octahedral sites plays an important role in lattice parameter variation of spinel lattice [17,18,25,26]. At the primary stage of milling Cd 2+ ions started to get into tetrahedral sites of ferrite lattice more rapidly than Zn 2+ ions.…”

Electrical and magnetic behaviour of nanostructured MgFe2O4 spinel ferrite

“…The variation of the Néel temperature with grain size [4,5], a high coercivity [6] and enhanced magnetic moments [7,8] has been observed in nanosized ferrite particles compared with those of bulk samples. The Néel temperature of Ni 0.5 Zn 0.5 Fe 2 O 4 spinel ferrite was shown to increase from 538 K in the bulk state to 611 K when the grain size was reduced to 14 nm using high-energy ball milling [9].…”

Cation distribution and magnetic behavior of Mg1 − x Zn x Fe2O4 ceramics monitored by Mössbauer Spectroscopy

“…The interaction is called "Fe 3+ (A)-O-Fe 3+ [B] superexchange interaction" which resulting in the amount of magnetization. The magnetic properties depend on magnetic cation distribution between (A) and [B] sites in MgFe 2 O 4 [11,12]. Flexibility of cation distribution in MgFe 2 O 4 is monitored by various techniques such as refinement of XRD and neutron diffraction patterns, magnetization measurement and Mössbauer spectroscopy.…”

“…Recently,Šepelák et al showed that changing in the magnesium ferrite was caused by the high-energy milling process. This process led to an enhancing in the magnetization of MgFe 2 O 4 corresponding to the mechanically induced cation distribution, redistribution and spin canting [4,11,12]. Lee [2].…”