ChemInform Abstract: Structure and Magnetic Properties of BiFe_0.75Mn_0.25O₃ Perovskite Prepared at Ambient and High Pressure.

Abstract

0.75 Mn 0.25 O 3 crystallizes in the space group R3c with Z = 6 and high pressure BiFe0.75Mn0.25O3 in the space group Pnma with Z = 16 (PbZrO3-related type structure). The structure of the high pressure phase is antiferroelectric and combines an intricate octahedral tilting pattern with displacements of the Bi atoms and deformations of the (FeMn)O6 octahedra. Both ambient and high pressure phases undergo an antiferromagnetic ordering at 485 and 520 K, resp., and develop a weak net magnetic moment at low temperatures. Ceramic samples of ambient pressure BiFe 0.75 Mn 0.25 O 3 show a peculiar phenomenon of magnetization reversal. -(BELIK*, A. A.; ABAKUMOV, A. M.; TSIRLIN, A. A.; HADERMANN, J.; KIM, J.; VAN TANDELOO, G.; TAKAYAMA-MUROMACHI, E.; Chem. Mater. 23 (2011) 20, 4505-4514, http://dx.

Mn substitution-induced revival of the ferroelectric antiferromagnetic phase in Bi1−x Ca x FeO3−x/2 multiferroics

“…1b) typical of the intermediate AFE phase of the Bi 1-x Ln x FeO 3 perovskites [12][13][14]. The isostructural phase can be stabilized in the high-pressure synthesized BiFe 1-y Mn y O 3 compounds [16]. The FE-AFE structural phase transition was also reported for pure BiFeO 3 under applied pressure [31].…”

“…The nature of the rhombohedral-orthorhombic transition should be related to the complex interplay of structural distortions due to the stereochemically active 6s 2 lone pair of the Bi 3? ions and rotations of hFe/Mni O 6 octahedra, as modified by the compression [16,31].…”

“…Lanthanide substitution, for instance, gives rise to the simultaneous ferroelectric-antiferroelectric (FE-AFE) and antiferromagnetic-weak ferromagnetic (AFM-wFM) transitions in the Bi 1-x Ln x FeO 3 series [12][13][14]. Decoupling of the structural and magnetic transformations resulting in the appearance of a weak ferromagnetic polar phase untypical of the Bi 1-x Ln x FeO 3 [12][13][14] and BiFe 1-y Mn y O 3 [15,16] series can occur in the (Bi,Ln)Fe 1-y Mn y O 3 systems upon the B-site substitution [17,18] (manganese possesses the highest solubility in BiFeO 3 [15] and thus can be conveniently used for the multiferroic properties tuning). A similar intermediate state exhibiting the spontaneous polarization and weak ferromagnetism has been reported for the Bi 1-x Ca x FeO 3-x/2 perovskites [19,20].…”

Magnetic interactions in BiFe0.5Mn0.5O3 films and BiFeO3/BiMnO3 superlattices

“…4(b)). With increasing doping concentration of Mn, T N of BFO continuously decreases26. T N of BFMO ceramics decreases to 440 K27.…”

Substitution-driven structural, optical and magnetic transformation of Mn, Zn doped BiFeO

“…Alexei A. Belik et al have reported BiFe 0.75 Mn 0.25 O 3 orthorhombic PbZrO 3 -type in Pnma space group structure, which shows an intricate octahedral tilting pattern with Bi atoms displacement and (FeMn)O 6 octahedra deformation. The transformation of the ferroelectric R3c structure into this new type of superstructure induces a weak net magnetic moment [12]. Mn 3 þ is chosen due to its similar size, different electronic structure and tendency toward ferromagnetic couplings (the end member BiMnO 3 with monoclinic structure is an orbitally ordered ferromagnetic [13] (T C ¼ À105 1C) or canted antiferromagnetic (T N ¼ À243 1C) depending on oxygen stoichiometry).…”