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Explanation of diffuse scattering mechanism based on the structure of polar nanoregions in Ba(Ti1−x
D. B. Williams and C. B. Carter, Transmission Electron Microscopy: A Textbook for Materials Science, 2nd ed. ( Springer Science & Business Media Press, USA, 2009), p. 487.
S. J. Pennycook et al., in Scanning Transmission Electron Microscopy Imaging and Analysis, edited by S. J. Pennycook and P. D. Nellist ( Springer Science & Business Media Press, USA, 2011), p. 163.
J. M. Cowley, Diffraction Physics ( Elsevier Press, The Netherlands, 1995), p. 296.
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In addition to the excellent dielectric and piezoelectric properties of Ba(Ti1−
xSnx)O3, the special diffuse scattering phenomena observed in its electron diffraction patterns have attracted much attention. Herein, a model of the microstructure of the polar nanoregions in Ba(Ti1−
xSnx)O3 was established and used to simulate the diffuse scattering patterns from several major zones that agreed well with the experimental patterns. The direct relationship between the magnitude of the diffuse scattering strings and the size of the polar nanoregions was also discussed in detail. This analysis method is also suitable for other relaxor systems that contain coherent polar nanoregions at the atomic scale, such as Ba(Ti1−
xZrx)O3. Thus, these results provide a better understanding of the origin and formation of diffuse scattering phenomena and a universal method to deal with nano-sized polar nanoregions in relaxed materials.
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