Interplay of inequivalent atomic positions in resonant x-ray diffraction of Fe3BO6

DOI: 10.1088/0953-8984/21/26/265402

Authors: E. Ovchinnikova (Moscow State University) , V. E. Dmitrienko (AV Shubnikov Institute of Crystallography) , J. E. Lorenzo (Institut Louis Néel, CNRS) , J-l. Hodeau (Institut Louis Néel, CNRS) , A. Kirfel (University of Bonn) , Y. Joly (Institut Louis Néel, CNRS) , A. A. A A Antonenko (Moscow State University) , G. Beutier (Diamond Light Source) , A. Bombardi (Diamond Light Source) , S. P. Collins (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter , VOL 21

State: Published (Approved)
Published: June 2009

Abstract: 'Forbidden' Bragg reflections of iron orthoborate Fe3BO6 were studied theoretically and experimentally in the vicinity of the iron K edge. Their energy spectra are explained as resulting from the interference of x-rays scattered from two inequivalent crystallographic sites occupied by iron ions. This particular structure property gives rise to complex azimuthal dependences of the reflection intensities in the pre-edge region as they result from the interplay of site specific dipole-quadrupole and quadrupole-quadrupole resonant scattering. Also evidenced is an anisotropic character of the absorption spectrum. Self-absorption correction to the diffraction data, as well as possible contributions of thermal vibrations and magnetic order, are discussed. Particular care is given to extracting clean spectra from the data, and it is demonstrated that excellent results can be obtained even from measurements that appear corrupted by several effects such as poor crystal quality and multiple scattering.

Journal Keywords: Absorption Spectra; Anisotropy; Borates; Bragg Reflection; Crystallography; Dipoles; Energy Spectra; Interference; Iron; Iron Compounds; Iron Ions; Multiple Scattering; Quadrupoles; Resonance Scattering; Self-Absorption; Simulation; X Radiation; X-Ray Diffraction

Subject Areas: Materials


Instruments: I16-Materials and Magnetism

Added On: 22/06/2009 12:51

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