Mössbauer spectral analysis and magnetic properties of the superparamagnetic Mn0. 5Zn0. 5Fe2O4 ferrite nanocomposites

Manganese-zinc (Mn-Zn) ferrites of the composition Mn0.5Zn0.5Fe2O4 are synthesized by solid-state reactions.
Portions of the synthesized material are then ball milled for 1, 2, 4, 8, and 12 h. Their physical properties are
subsequently analyzed by XRD, M¨ ossbauer spectroscopy, and magnetization measurements. The XRD analysis
reveals the cubic spinel structure for all milled samples. Upon ball milling, however, the crystalline size
decreased while the microstrain increased significantly. Moreover, the magnetic order is enhanced by ball
milling, as shown by the M¨ ossbauer effect and magnetization measurements. The observed magnetic charac-
teristics are consistent with ball milling changing the chemical order at the two sites of the spinel structure. The
distribution of cations for the composition of these samples is suggested by considering the Fe3+ ions amounts
that exist at the octahedral and tetrahedral sites. Interestingly, the milling process played a crucial role in
enhancing the magnetization of these Mn-Zn ferrites. The remarkable magnetization of these Mn-Zn ferrites is
useful for energy-related applications.