Contrast anomaly of planar defects in synchrotron white-beam topography of Fe-doped KTa_1−xNb_xO₃

Z. W. Hu National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210008, P.R. China

S. S. Jiang National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210008, P.R. China

X. R. Huang National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210008, P.R. China

D. Feng National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210008, P.R. China

J. Y. Zhao Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Beijing, 100039, P.R. China

J. H. Jiang Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Beijing, 100039, P.R. China

Y. L. Ting Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Beijing, 100039, P.R. China

Y. Han Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Beijing, 100039, P.R. China

J. Y. Wang Institute of Crystals Materials, Shandong University, Jinan, 250100, P.R. China

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Abstract

The contrast anomaly of a set of planar defects in Fe-doped KTa_1−xNb_xO₃ with a Curie point near room temperature has been studied by synchrotron white-beam X-ray topography. A striking wavelength-dependent characteristic of the defect contrast is shown by tuning the synchrotron radiation, and the contrast reversal of the planar defects is displayed in antiparallel reflections. The intense anomaly in contrast is interpreted in terms of anomalous dispersion associated with antiparallel domains.

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Contrast anomaly of planar defects in synchrotron white-beam topography of Fe-doped KTa_1−xNb_xO₃

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Contrast anomaly of planar defects in synchrotron white-beam topography of Fe-doped KTa1−xNbxO3

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Contrast anomaly of planar defects in synchrotron white-beam topography of Fe-doped KTa_1−xNb_xO₃