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Phase transition of KDP observed by Resonant X-ray Diffraction at forbidden reflections

DOI: 10.1088/1742-6596/519/1/012006 DOI Help

Authors: Guillaume Beutier (SIMaP, Grenoble Institute of Technology – CNRS – Grenoble Alpes University; Diamond Light Source) , Steve Collins (Diamond Light Source) , Elena Ovchinnikova (Moscow State University) , Gareth Nisbet (Diamond Light Source) , Vladimir Dmitrienko (AV Shubnikov Institute of Crystallography)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Conference Series , VOL 519

State: Published (Approved)
Published: May 2014

Abstract: We report observations of space-group-forbidden Bragg reflections in Potassium (KH2PO4), at the potassium K edge. We find clear evidence for a transition from one class of space-group-forbidden reflections, where scattering is ruled out by the electric dipole approximation, to a second class, in the ferroelectric phase, where scattering can proceed due to resonant anisotropy within the dipole approximation. The change of symmetry is clearly evidenced by the sudden change of intensity and energy spectrum of the forbidden reflections.

Journal Keywords: Anisotropy; Approximations; Bragg Reflection; Electric Dipoles; Energy Spectra; Ferroelectric Materials; Hydrogen Compounds; Phase Transformations; Potassium; Potassium Phosphates; X-Ray Diffraction

Subject Areas: Physics


Instruments: I16-Materials and Magnetism