Formation of crystalline MnFe2O4 powder by flame-combusting freeze-dried citrate precursors

Synthesis of complex ceramics by mechanochemical activation

“…Such decomposition of MF in the temperature range 600-750 • C has been reported by several workers who studied the stability of this compound at high temperatures [3][4][5].…”

Synthesis and Characterization of FeO/Ni0.5Mn0.5Fe2O4 Nano-Composite

“…Several investigations were reported to prepare mixed nickelmanganese ferrites using different preparation methods [8][9][10][11][12][13] . Some authors pointed that the addition of a certain amounts of Ni species to manganese ferrite at elevated temperatures resulted in a decrease in the conversion of Mn 2+ to Mn 3+ ions at the surface layer with subsequent an increase in the stability of the Ni-Mn ferrite 11,12 . In other words, the thermal stability of the mixed ferrite is greater than that of single ferrite.…”

“…Other investigators claimed that the increase in the content of Mn species involved in the mixed ferrite led to formation of iron oxide as a secondary phase 13 . However, the change in the molar ratio of the reacting species led to a significant modification in different properties of the as prepared mixed ferrites [8][9][10][11][12][13] .…”

Single‐Phase MnFe2O4 Powders Obtained by the Polymerized Complex Method

“…Ferrites are often prepared by high‐temperature solid‐state reactions 6 . Several methods including coprecipitation, 7–13 sol–gel, 14 hydrothermal, 15 combustion, 16,17 freeze drying, 18 and synthesis in reverse micelles which involve preparation at room or relatively low temperatures (typically below 100°C) 19–22 were applied up to now in order to develop high‐quality ferrite nanopowders. Spinel ferrite MnFe 2 O 4 nanoparticles were synthesized recently by means of a nanocasting technique using a low‐cost mesoporous silica gel as a hard template 23 and also in macroporous styrene–divinylbenzene copolymer 24 .…”