Enhancement of magnetoelectric coupling in Cr doped Mn₂O₃

Abstract

The effect of Cr doping with nominal compositions Mn 2-x Cr x O 3 (0  x  0.10) has been undertaken to investigate its effect on structural, magnetic, dielectric and magnetoelectric properties. The Cr doping transformed the room temperature crystal structure from orthorhombic to cubic symmetry. Similar to -Mn 2 O 3 , two magnetic transitions have been observed in the Cr doped samples. The effect of Cr doping is significant on the low temperature transition i.e. the lower magnetic transition shifted towards higher temperature (25 K for pristine to 40 K for x=0.10) whereas the high temperature transition decreases slightly with increasing Cr content. A clear frequency independent transition is observed in complex dielectric measurements for all compositions around high temperature magnetic ordering. Interestingly, the magnetodielectric behaviour enhanced enormously 21% with Cr substitution as compared to pristine Mn 2 O 3 .

Structural Stability and Properties of Marokite-Type γ-Mn3O4

“…Synthetic manganese oxides and manganese oxide minerals play an important role in different technological processes and applications. , For example, some of them are utilized as effective catalysts, − as supercapacitors, as ferroelectrics or multiferroics, − as elements in ion batteries, − as semiconductors, and for many other purposes. − In general, manganese oxides, including Mn-based perovskites, − are inexpensive and highly functional materials, which combine interesting electronic and magnetic properties and, therefore, have remained in the focus of recent investigations.…”

Temperature dependent structural properties of Mn1.90M0.10O3 (M = Cr and Fe)

“…The detail discussion about this feature is given in [6]. Recently, we have observed that at RT Mn 1.90 Cr 0.10 O 3 (MCO) crystallized in cubic symmetry with Ia-3 space group and exhibit large magnetodielectric effect as compared to pristine Mn 2 O 3 [8]. The dc magnetic susceptibility of MCO also shows two magnetic transitions as observed for parent compound.…”

“…phenomena always emerge during the phase transition process. In recent years, manganese oxide Mn 2 O 3 is studied for its intriguing magnetic and dielectric properties [6][7][8]. The manganese oxide is also one of the important ingredients for multiferroic materials which offers the existence of two or more primary ferroic orders in single material and their tunability; especially magnetoelectric coupling.…”

Influence of Mg doping on the structural and optical properties of manganese oxide (Mn2O3) nanoparticles

“…There have been some results on Zn-doped manganese oxide nanoparticles for various applications reported in the literature [31]. Chandraet al [32] reported the consequences of Cr doping on the various properties of Mn 2 O 3 nanoparticles such as structural, dielectric, magneto-electric and magnetic properties. It has been observed that the symmetry changes to cubic with Cr doping from orthorhombic at room temperature.…”