Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 11, Pages 1692-1698Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2009.02.008
Keywords
BiFeO3; Multiferroics; Ferroelectricity; Magnetism
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Investigation of crystal structure, dielectric, magnetic and local ferroelectric properties of the diamagnetically substituted Bi(1-x)A(x)FeO(3-x/2) (A = Ca, Sr, Pb, Ba; x = 0.2, 0.3) polycrystalline samples has been carried out. It has been shown that the heterovalent A(2+) substitution result in the formation of oxygen vacancies in the host lattice. The solid solutions have been found to possess a rhombohedrally distorted perovskite structure described by the space group R3c. Piezoresponse force microscopy has revealed signs of existence of the ferroelectric polarization in the samples at room temperature. Magnetization measurements have shown that the magnetic state of these compounds is determined by the ionic radius of the substituting elements. A-site substitution with the biggest ionic radius ions has been found to suppress the spiral spin structure of BiFeO3 giving rise to the appearance of room-temperature weak ferromagnetism. (C) 2009 Elsevier B.V. All rights reserved.
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