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

Abstract

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

Authors:
;  [1]
  1. Saskatchewan
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1089572
Resource Type:
Journal Article
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 52; Journal Issue: (15) ; 08, 2013; Journal ID: ISSN 0020-1669
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Walker, James D.S., and Grosvenor, Andrew P. The Effect of Synthetic Method and Annealing Temperature on Metal Site Preference in Al1-xGaxFeO3. United States: N. p., 2013. Web. doi:10.1021/ic4007636.
Walker, James D.S., & Grosvenor, Andrew P. The Effect of Synthetic Method and Annealing Temperature on Metal Site Preference in Al1-xGaxFeO3. United States. https://doi.org/10.1021/ic4007636
Walker, James D.S., and Grosvenor, Andrew P. 2013. "The Effect of Synthetic Method and Annealing Temperature on Metal Site Preference in Al1-xGaxFeO3". United States. https://doi.org/10.1021/ic4007636.
@article{osti_1089572,
title = {The Effect of Synthetic Method and Annealing Temperature on Metal Site Preference in Al1-xGaxFeO3},
author = {Walker, James D.S. and Grosvenor, Andrew P.},
abstractNote = {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 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 Al1–xGaxFeO3 compounds have high Al content, and when annealed at higher temperatures.},
doi = {10.1021/ic4007636},
url = {https://www.osti.gov/biblio/1089572}, journal = {Inorganic Chemistry},
issn = {0020-1669},
number = (15) ; 08, 2013,
volume = 52,
place = {United States},
year = {Thu Aug 15 00:00:00 EDT 2013},
month = {Thu Aug 15 00:00:00 EDT 2013}
}