Synthesis, Crystal Structure, and Magnetic Properties of MnFe₃O₅

Abstract

MnFe3O5 was synthesized under a pressure of 10 GPa at 1400 °C. MnFe3O5 has an orthorhombic structure (space group Cmcm, a = 2.9137(1), b = 9.8565(7) and c = 12.6143(6) Å at 300 K) and is isostructural with Fe4O5. Magnetic measurements reveal an antiferromagnetic transition at 350 K and a broad Curie transition at 150 K, similar to the spin ordering temperatures of Fe4O5. Variable temperature synchrotron X‐ray diffraction shows that the structure undergoes anisotropic thermal expansion below 350 K, but no long range charge ordering is observed in the crystal structure.

Cation, magnetic, and charge ordering in MnFe3O5

“…1 ) show a maximum at 350 K and a broad magnetic upturn signifying a ferro- or ferri-magnetic ordering at 150 K as reported previously. 14 This is corroborated by the saturated magnetisations observed in hysteresis loops at 2 and 75 K.…”

“…We recently reported the synthesis at high pressures of the first n > 3 M = Mn material in this family, the n = 4 member MnFe 3 O 5 . 14 MnFe 3 O 5 is isostructural with Fe 4 O 5 and adopts the orthorhombic Sr 2 Tl 2 O 5 -type structure (space group Cmcm ) in which divalent cations occupy triangular prismatic sites within triangular channels in a network of corner and edge-sharing octahedra. MnFe 3 O 5 showed two magnetic transitions – an antiferromagnetic transition at 350 K and a broad ferromagnetic transition at 150 K – indicating that complex spin–spin interactions are present.…”

Long range electronic phase separation in CaFe3O5

“…Here, following recent studies of spin and charge ordering in non-spinel M Fe n –1 O n +1 ( n  ≥ 4) ferrites with M  = Fe 6,7 , Mn 8,9 and Ca 10,11 , we investigate n  = 4 CaFe 3 O 5 and discover long range electronic phase separation between a magnetite-like charge ordered phase and a charge averaged phase.…”

Complex Ferrimagnetism and Magnetoresistance Switching in Ca-Based Double Double and Triple Double Perovskites

“…Significant magnetic intensities are marked by "m". (a) CaMnFeR-eO6 and (b) Ca(Mn0.5Cu0.5)FeReO6 both show MnFe3O5 as a magnetic impurity,20 fit as an intensity matching le Bail phase. (c) CaMnMnReO6 with an MnO impurity (3.6(2)%).…”