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Probing the local atomic structure in CoLa0.15Fe1.85O4 as a function of the synthesis method by multi edge XAFS

Imam, N. G. LU ; Aquilanti, G. ; Mansour, S. F. ; Heiba, Zein K. and Meneghini, Carlo (2019) In Materials Research Express 6(11).
Abstract

We combined x-ray powder diffraction (XRD) and x-ray absorption fine structure spectroscopy (XAFS) to characterize the crystallographic and local atomic structure of nanosized La3+ substituted CoFe2O4 spinel ferrite of composition CoLa0.15Fe1.85O4 synthesized by different synthesis routes: standard ceramic technique, citric acid (citrate) precursor and urea assisted flash auto-combustion process. Rietveld refinement of XRD patterns allowed to describe the long-range atomic structure that was used as structural model for quantitative analysis of XAFS spectra collected at the Fe-K, Co-K and La-L3 and refined via a multi-edge approach, which provided details about... (More)

We combined x-ray powder diffraction (XRD) and x-ray absorption fine structure spectroscopy (XAFS) to characterize the crystallographic and local atomic structure of nanosized La3+ substituted CoFe2O4 spinel ferrite of composition CoLa0.15Fe1.85O4 synthesized by different synthesis routes: standard ceramic technique, citric acid (citrate) precursor and urea assisted flash auto-combustion process. Rietveld refinement of XRD patterns allowed to describe the long-range atomic structure that was used as structural model for quantitative analysis of XAFS spectra collected at the Fe-K, Co-K and La-L3 and refined via a multi-edge approach, which provided details about local atomic structure and coordination chemistry around the absorbers. Combining the complementary information from XRD and XAFS it was possible to reliably describe the cation distribution over the two spinel sublattices (tetrahedral and octahedral) as a function of the synthesis routes. We demonstrated that the inversion parameter, the cation distribution, and the local atomic structure depend strongly on the synthesis method which in particular affects the La3+ lattice-site and vacancies. In particular the citrate synthesis appears to provide a pure single pure phase with highest coordination number of La and lowest inversion parameter.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
EXAFS, La: Co FeO, local atomic structure, synchrotron radiation, XAFS, XANES, XRD
in
Materials Research Express
volume
6
issue
11
article number
115502
publisher
IOP Publishing
external identifiers
  • scopus:85073876150
ISSN
2053-1591
DOI
10.1088/2053-1591/ab44e5
language
English
LU publication?
yes
id
74b7f4cc-b7e5-4bc7-9140-63d8f854d024
date added to LUP
2019-11-06 10:37:28
date last changed
2022-04-18 18:45:53
@article{74b7f4cc-b7e5-4bc7-9140-63d8f854d024,
  abstract     = {{<p>We combined x-ray powder diffraction (XRD) and x-ray absorption fine structure spectroscopy (XAFS) to characterize the crystallographic and local atomic structure of nanosized La<sup>3+</sup> substituted CoFe<sub>2</sub>O<sub>4</sub> spinel ferrite of composition CoLa<sub>0.15</sub>Fe<sub>1.85</sub>O<sub>4</sub> synthesized by different synthesis routes: standard ceramic technique, citric acid (citrate) precursor and urea assisted flash auto-combustion process. Rietveld refinement of XRD patterns allowed to describe the long-range atomic structure that was used as structural model for quantitative analysis of XAFS spectra collected at the Fe-K, Co-K and La-L<sub>3</sub> and refined via a multi-edge approach, which provided details about local atomic structure and coordination chemistry around the absorbers. Combining the complementary information from XRD and XAFS it was possible to reliably describe the cation distribution over the two spinel sublattices (tetrahedral and octahedral) as a function of the synthesis routes. We demonstrated that the inversion parameter, the cation distribution, and the local atomic structure depend strongly on the synthesis method which in particular affects the La<sup>3+</sup> lattice-site and vacancies. In particular the citrate synthesis appears to provide a pure single pure phase with highest coordination number of La and lowest inversion parameter.</p>}},
  author       = {{Imam, N. G. and Aquilanti, G. and Mansour, S. F. and Heiba, Zein K. and Meneghini, Carlo}},
  issn         = {{2053-1591}},
  keywords     = {{EXAFS; La: Co FeO; local atomic structure; synchrotron radiation; XAFS; XANES; XRD}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{11}},
  publisher    = {{IOP Publishing}},
  series       = {{Materials Research Express}},
  title        = {{Probing the local atomic structure in CoLa<sub>0.15</sub>Fe<sub>1.85</sub>O<sub>4</sub> as a function of the synthesis method by multi edge XAFS}},
  url          = {{http://dx.doi.org/10.1088/2053-1591/ab44e5}},
  doi          = {{10.1088/2053-1591/ab44e5}},
  volume       = {{6}},
  year         = {{2019}},
}