OXIDE NANOMATERIALS WITH PROPERTIES ABSENT IN BULK (AUTHOR REVIEW)

  
V.V.Khist,
 
A.N.Morozovska
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #01/02
http://www.materials.kiev.ua/article/907

Abstract

A ferroelectric phase can be induced in otherwise nonferroelectric binary oxides like BaO, EuO, and Er2O3 by a strong enough intrinsic surface stress present under the curved surface in nanowires. Our analytical calculations performed within the Landau–Ginzburg–Devonshire theory prove that BaO nanowires can be ferroelectric at room temperatures. Undoped nanoparticles of incipient ferroelectrics SrTiO3 and KTaO3 without any magnetic ions can become ferromagnetic even at room temperatures due to the presence of a new type of magnetic defects, such as oxygen vacancies, inherent to nanostructures. Nanosized EuOxSr1–xTiO3 wires and tubes are shown to be the new multiferroics with “triple” the antiferrodistortive–ferroelectric–ferromagnetic phase, which is of interest for fundamental study and can be important for their potential applications. We hope that our predictions will stimulate experimental studies of the nanosized binary oxides and perovskites.


ANTIFERRODISTORTIVE PHASE, ANTIFERRODISTORTIVE–FERROELECTRIC–FERROMAGNETIC PHASE, BINARY OXIDES, NANOWIRES, PEROVSKITES, SURFACE TENSION