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Microdomain texture and microstructures of Fe4+-containing CaTi0.4Fe0.6O3-δ

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Author(s)

J Canales-Vazquez, FM Figueiredo, JC Waerenborgh, Wuzong Zhou, JR Frade, John Thomas Sirr Irvine

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Abstract

A study of the structure of Fe-1V CaTi0.4Fe0.6O3-delta is presented and compared to data on the Fe-III counterparts. The powder XRD pattern was dominated by a simple cubic perovskite unit cell;, however, some small peaks indicated an orthorhombic distortion. All peaks could be indexed using a space group analogous to the Fe-III phase Ca3TiFe2O8. From HRTEM the strong cubic peaks are well explained by the Superposition of three equivalent and mutually perpendicular orthorhombic unit cells. TEM analysis further revealed a microdomain structure consisting of disordered intergrowths of CaTiO3- and Ca3TiFe2O8-like phases. Mossbauer spectra show that ca. 4% of the Fe cations are in the 4+ oxidation state. Results suggest that the Fe 4+ cations are associated with octahedral coordination and hence are associated with the CaTiO3-like regions, transition regions between the CaTiO3- and Ca3TiFe2O8 intergrown phases and the domain boundaries. Structural models for the intergrowths are proposed based on HRTEM image simulations. (C) 2004 Elsevier Inc. All rights reserved.

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Original languageEnglish
Pages (from-to)3105-3113
Number of pages9
JournalJournal of Solid State Chemistry
Volume177
DOIs
Publication statusPublished - Sep 2004

    Research areas

  • titanates, structure, microdomains, HRTEM, image simulation, Mossbauer spectroscopy, CALCIUM LANTHANUM FERRITES, OXYGEN VACANCIES, CAFE(X)TI1-XO3-X/2 PEROVSKITES, MOSSBAUER-SPECTROSCOPY, ELECTRON-MICROSCOPY, CRYSTAL-STRUCTURE, SHORT-RANGE, TEMPERATURE, CATI1-XFEXO3-DELTA, CAXLA1-XFEO3-Y

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