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Domain Boundary and Domain Switching in a Ceramic Rare‐Earth Orthoniobate LaNbO 4
Author(s) -
Jian Li,
Wayman C. Marvin
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08776.x
Subject(s) - boundary (topology) , diffraction , domain (mathematical analysis) , materials science , ceramic , lattice (music) , condensed matter physics , crystallography , geometry , chemistry , mathematics , mathematical analysis , physics , optics , composite material , acoustics
By using TEM and X‐ray diffraction, the domain structure in ceramic LaNbO 4 has been studied. It has been found that the domains have two different orientations, separated by a boundary with_irrational Miller indexes between (20) I / (402) II and (20) I /(602) II lattice planes, which is in good agreement with the boundary indexes calculated from elasticity theory and spontaneous strain tensor. The orientation relationship between the domains has been determined as a rotation of 95.6° about the [010] axis. A model for domain boundary configuration, a diffuse boundary with a transition zone, has been proposed according to TEM diffraction patterns and HRTEM images. Based on this domain boundary model, a domain switching mechanism is suggested, and the corresponding driving force for domain switching is considered.