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Title: The Effect of Synthetic Method and Annealing Temperature on Metal Site Preference in Al 1-xGa xFeO 3

Magnetoelectric materials couple both magnetic and electronic properties, making them attractive for use in multifunctional devices. The magnetoelectric AFeO 3 compounds (Pna2 1; A = Al, Ga) have received attention as the properties of the system depend on composition as well as the synthetic method used. Al 1–xGa xFeO 3 (0 ≤ x ≤ 1) was synthesized by the sol–gel and coprecipitation methods and studied by X-ray absorption near-edge spectroscopy (XANES). Al L 2,3⁻, Ga K-, and Fe K-edge XANES spectra were collected to examine how the average metal coordination number (CN) changes with the synthetic method. Al and Fe were found to prefer octahedral sites, while Ga prefers the tetrahedral site. It was found that composition played a larger role in determining site occupancies than synthetic method. Samples made by the sol–gel or ceramic methods (reported previously; Walker, J. D. S.; Grosvenor, A. P. J. Solid State Chem. 2013, 197, 147–153) showed smaller spectral changes than samples made via the coprecipitation method. This is attributed to greater ion mobility in samples synthesized via coprecipitation as the reactants do not have a long-range polymeric or oxide network during synthesis like samples synthesized via the sol–gel or ceramic method. Increasing annealingmore » temperature increases the average coordination number of Al, and to a lesser extent Ga, while the average coordination number of Fe decreases. This study indicates that greater disorder is observed when the Al 1–xGa xFeO 3 compounds have high Al content, and when annealed at higher temperatures.« less
Authors:
;  [1]
  1. Saskatchewan
Publication Date:
OSTI Identifier:
1089572
Resource Type:
Journal Article
Resource Relation:
Journal Name: Inorganic Chemistry; Journal Volume: 52; Journal Issue: (15) ; 08, 2013
Publisher:
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org:
FOREIGN
Country of Publication:
United States
Language:
ENGLISH