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Title: The Effect of Synthetic Method and Annealing Temperature on Metal Site Preference in Al1-xGaxFeO3

Magnetoelectric materials couple both magnetic and electronic properties, making them attractive for use in multifunctional devices. The magnetoelectric AFeO3 compounds (Pna21; A = Al, Ga) have received attention as the properties of the system depend on composition as well as the synthetic method used. Al1–xGaxFeO3 (0 ≤ x ≤ 1) was synthesized by the sol–gel and coprecipitation methods and studied by X-ray absorption near-edge spectroscopy (XANES). Al L2,3⁻, 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 annealing temperature increases the average coordination numbermore » 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 Al1–xGaxFeO3 compounds have high Al content, and when annealed at higher temperatures.« less
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  1. Saskatchewan
Publication Date:
OSTI Identifier:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Inorganic Chemistry; Journal Volume: 52; Journal Issue: (15) ; 08, 2013
American Chemical Society (ACS)
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
Country of Publication:
United States