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Ferroelastic domain structures and phase transitions in barium sodium niobate
Author(s) -
Jiang S. S.,
Surowiec M.,
Tanner B. K.
Publication year - 1988
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889887010471
Subject(s) - orthorhombic crystal system , tetragonal crystal system , domain (mathematical analysis) , condensed matter physics , phase (matter) , materials science , phase transition , synchrotron radiation , barium , domain wall (magnetism) , ferroelasticity , crystallography , optics , ferroelectricity , chemistry , crystal structure , dielectric , physics , magnetization , optoelectronics , mathematical analysis , mathematics , organic chemistry , quantum mechanics , magnetic field , metallurgy
Ferroelastic domains in barium sodium niobate (Ba 2 NaNb 5 O 15 ) have been studied by X‐ray Lang and white‐beam synchrotron‐radiation topography. In Lang topographs contrast was observed from domain walls and the domains themselves, the latter being due to anomalous dispersion. Most ferroelastic domain boundaries lay on (110) or (10) planes. The contrast from the ferroelastic domain walls suggests that displacements exist within the walls, probably due to walls zigzagging between {110} planes. As the temperature was raised, significant changes occurred in the domain configuration, and a single‐domain state was formed at 559 K, well below the orthorhombic‐to‐tetragonal phase transition at 573 K. No evidence for an incommensurate phase or an associated domain structure could be found in the samples studied.