Direct x-ray synchrotron imaging of strains at 180° domain walls in congruent LiNbO[sub 3] and LiTaO[sub 3] crystals

Kim, Sungwon; Songwon Kim; Gopalan, Venkatraman; Steiner, B.
September 2000
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
Academic Journal
We present direct evidence for wide regions of strain on length scales of many micrometers associated with 180° domain walls in congruent LiNbO[sub 3] and LiTaO[sub 3] crystals. Strain contrast in symmetric high-resolution diffraction images of these crystals in Bragg geometry arises in part from curvature in the basal planes (0001) across a domain wall as well as from lateral variation in the lattice spacing of the basal planes extending over many micrometers in going across a wall. © 2000 American Institute of Physics.


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