Title
Long-range ordering in the <tex>$Bi_{1-x}Ae_{x}FeO_{3-x/2}$</tex> perovskites: <tex>$Bi_{1/3}Sr_{2/3}FeO_{2.67}$</tex> and <tex>$Bi_{1/2}Ca_{1/2}FeO_{2.75}$</tex> Long-range ordering in the <tex>$Bi_{1-x}Ae_{x}FeO_{3-x/2}$</tex> perovskites: <tex>$Bi_{1/3}Sr_{2/3}FeO_{2.67}$</tex> and <tex>$Bi_{1/2}Ca_{1/2}FeO_{2.75}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London ,
Subject
Physics
Source (journal)
Journal of solid state chemistry. - London
Volume/pages
181(2008) :10 , p. 2601-2609
ISSN
0022-4596
ISI
000260441000008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Two-ordered perovskites, Bi1/3Sr2/3FeO2.67 and Bi1/2Ca1/2FeO2.75, have been stabilized and characterized by transmission electron microscopy, Mössbauer spectroscopy and X-ray powder diffraction techniques. They both exhibit orthorhombic superstructures, one with a≈b≈2ap and c≈3ap (S.G.: Pb2n or Pbmn) for the Sr-based compound and one with a≈b≈2ap and c≈8ap (S.G.: B222, Bmm2, B2mm or Bmmm) for the Ca-based one. The high-resolution transmission electron microscopy (HRTEM) images evidence the existence of one deficient [FeOx]∞ layer, suggesting that Bi1/3Sr2/3FeO2.67 and Bi1/2Ca1/2FeO2.75 behave differently compared to their Ln-based homolog. The HAADF-STEM images allow to propose a model of cation ordering on the A sites of the perovskite. The Mössbauer analyses confirm the trivalent state of iron and its complex environment with three types of coordination. Both compounds exhibit a high value of resistivity and the inverse molar susceptibility versus temperature curves evidence a magnetic transition at about 730 K for the Bi1/3Sr2/3FeO2.67 and a smooth reversible transition between 590 and 650 K for Bi1/2Ca1/2FeO2.75.
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