Diffraction and spectroscopic study of pyrochlores Bi2−xFe1+xSbO7

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The structural and electronic properties of the series Bi2−xFe1+xSbO7 (0 ⩽ x ⩽ 0.6) were investigated using a combination of diffraction and spectroscopy. Synchrotron and neutron diffraction analysis show that Fe3+ cations substitute for Bi3+ onto the A site with increasing x, which was further confirmed by analysis of the Fe K/L-edge X-ray absorption near-edge spectra. The diffraction analysis indicated the presence of displacive disorder along the A2O chains, likely the result of the Bi3+ 6s2 lone pair, as well as non-Vegard-like behaviour of the lattice parameters in the Fe-poor region. Fe K-edge extended X-ray absorption fine-structure analysis of Bi2FeSbO7 confirmed the displacive disorder of the Bi3+ cations as well as Sb5+ and Fe3+ disorder on the B site. © 2013 Elsevier B.V.
Neutron diffraction, X-ray diffraction, Pyrochlore, Bismuth oxides, Crystal lattices, Fine structure
Zhou, Q., Blanchard, P. E. R., Kennedy, B. J., Ling, C. D., Liu, S., Avdeev, M., Aitken, J. B., Tadich, A., & Brand, H. E. A. (2014). Diffraction and spectroscopic study of pyrochlores Bi2−xFe1+xSbO7. Journal of Alloys and Compounds, 589, 425-430. doi:10.1016/j.jallcom.2013.11.226