Indium‐Based Perovskites: A New Class of Near‐Room‐Temperature Multiferroics

Abstract

Die Temperatur steigt: Neue multiferroische Perowskite In1−xMxMO3 mit x=0.112–0.176 und M=Fe0.5Mn0.5 (siehe Bild) wurden mithilfe von Hochdrucktechniken hergestellt. Sie haben die gleiche Struktur wie BiFeO3 und hohe Curie‐Temperaturen; zudem handelt es sich bei ihnen um gekantete Antiferromagnete mit Néel‐Temperaturen nahe der Raumtemperatur.

New high Tc multiferroics KBiFe2O5 with narrow band gap and promising photovoltaic effect

“…S11). A similarly irreversible structural transition has been reported in a multiferroic perovskite in which both A site and B site are shared by In and Fe29.…”

Polar and Magnetic Mn2FeMO6 (M=Nb, Ta) with LiNbO3‐type Structure: High‐Pressure Synthesis

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Polar oxides are of much interest in materials science and engineering. [3] So far, several LN-type ABO 3 oxides have been discovered as metastable quenched phases, including ZnSnO 3 , [4a] [5] ScFeO 3 , [3b] and the high-pressure polymorphs of MnMO 3 (M = Ti, Sn) [6] and FeTiO 3 , [7] which show either SHG [4] or (near) room-temperature (RT) multiferroic behavior. [1] However, polar crystal design and synthesis is challenging, because multiple effects, such as steric or dipole-dipole interactions, typically combine to form non-polar structures; thus the number of known polar materials, especially polar magnetoelectric materials, is still severely restricted.

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“…Their symmetry-dependent properties, such as ferroelectricity/multiferroics, piezoelectricity, pyroelectricity, and second-order harmonic generation (SHG) effect are important for technological applications. [3,[5][6][7] Compared with the research in HP-stabilized LN-type ABO 3 oxides, there are few studies of systems with multiple B-site cations, such as A 2 BB'O 6 , containing small A-ions. [2] Therefore, it is necessary for the material science community to develop new strategies to create these materials.…”

Dielectric anomaly and magnetic properties of multiferroic GaFe0.75Mn0.25O3

“…This tilting occurs just to provide closer packing, and as a result the oxygen ions move closer to the rather small Y ions. Recently, Kan et al [6] tried to understand why (In 1À x M x )MO 3 (M¼Mn 0.5 Fe 0.5 ) has a significantly lower T N (about 270 K for xE0.176) [7] than does BiFeO 3 (650 K), and they expect that (Tl 1À x M x )MO 3 (M¼Mn 0.5 Fe 0.5 ) and (Ga 1À x M x )MO 3 (M¼Mn 0.5 Fe 0.5 ) compounds have T E lower than that of (In 1À x M x )MO 3 . In the present study GaFe 0.75 Mn 0.25 O 3 compound was prepared by the sol-gel method.…”