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Determination of displacement vector on 180° domain boundary and polarization arrangements in lead titanate crystals

Published online by Cambridge University Press:  31 January 2011

Chen-Chia Chou  and
C. Marvin Wayman
Chen-Chia Chou
Affiliation:
Materials Science and Technology Center and Department of Mechanical Engineering, National Taiwan Institute of Technology, 43 Keelung Road Section 4, Taipei, Taiwan 10672, Republic of China
C. Marvin Wayman
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
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Abstract

180° domain boundaries in flux-grown lead titanate single crystals show intriguing domain boundary extreme fringe contrast using transmission electron microscopy. Symmetrically distributed domain boundaries with alternate contrast have been observed, indicating that opposite displacement vectors exist one by one at boundaries. If appropriate reflection vectors were employed, an inclined domain boundary shows reversed fringe contrast. An analysis based upon the two-beam dynamical theory and a rule similar to stacking-fault contrast analysis was employed to predict the geometric configuration of a 180° domain boundary using the extreme fringe contrast (EFC) behavior. Appropriately choosing reflection vectors and utilizing the EFC reversal, a displacement vector as well as the polarization vector arrangement across a 180° domain boundary can be unambiguously identified. Employing the information derived from diffraction patterns and a tilting experiment across a nearby 90° boundary, the whole polarization configuration can be uniquely determined.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 457 - 466
Copyright
Copyright © Materials Research Society 1997

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