An X-ray absorption spectroscopic study of the metal site preference in Al1-xGaxFeO3

作者：Walker James D S; Grosvenor Andrew P^*

来源：Journal of Solid State Chemistry, 2013, 197: 147-153.

DOI：10.1016/j.jssc.2012.09.015

• XANES
• Magnetoelectric
• Metal site preference
• Anti-site disorder

Magnetoelectric materials have potential for being introduced into next generation technologies, especially memory devices. The AFeO(3) (Pna2(1); A=Al, Ga) system has received attention to better understand the origins of magnetoelectric coupling. The magnetoelectric properties this system exhibits depend on the amount of anti-site disorder present, which is affected by the composition and the method of synthesis. In this study, Al1-xGaxFeO3 was synthesized by the ceramic method and studied by X-ray absorption spectroscopy. Al L-2.3-, Ga K-, and Fe K-edge spectra were collected to examine how the average metal coordination number changes with composition. Examination of XANES spectra from Al1-xGaxFeO3 indicate that with increasing Ga content, Al increasingly occupies octahedral sites while Ga displays a preference for occupying the tetrahedral site. The Fe K-edge spectra indicate that more Fe is present in the tetrahedral site in AlFeO3 than in GaFeO3, implying more anti-site disorder is present in AlFeO3.

• 出版日期2013-1