Octahedral Rotation‐Induced Ferroelectricity in Cation Ordered Perovskites

• DOI: 10.1002/adma.201104674
• Publication Date: 2012-04-10T10:11:03Z
• Authors: James M. Rondinelli; Craig J. Fennie
• Keywords: Models, Molecular; Titanium; Condensed Matter - Materials Science; Rotation; Molecular Conformation; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; Oxides; 02 engineering and technology; Calcium Compounds; 01 natural sciences; 7. Clean energy; 0104 chemical sciences; Oxygen; Electricity; Cations; Transition Elements; 0210 nano-technology

Increasing demands for electric field-tunable electric, magnetic, and orbital (EMO) materials has renewed interests in ferroelectricity its coupling to EMO properties complex perovskite oxides. The historic design strategy achieve a spontaneous polarization involves the incorporation of second-order Jahn-Teller (SOJT) active cations. challenge, however, is that this mechanism limited specific chemistries polar distortions arise are largely decoupled from properties, limiting their use as multifunctional technology materials. Here we report crystal-chemistry criteria which circumvents those restrictions enables rational new displaying octahedral rotation-induced - an innovative route realize without need SOJT cations non-polar building blocks. exploits centric rotation patterns, strongly couple cation ordering commonly observed $AB$O$_3$ perovskites. By uniting switchable polarizations connectivity transition-metal oxygen octahedra, electric-field control over possible.