TITLE

Domain structure and polarization properties of lanthanum-substituted bismuth titanate single crystals

AUTHOR(S)
Soga, Masayuki; Noguchi, Yuji; Miyayama, Masaru; Okino, Hirotake; Yamamoto, Takashi
PUB. DATE
January 2004
SOURCE
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p100
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Single crystals of bismuth titanate (BiT) and lanthanum-substituted BiT [Bi[sub 4-x]La[sub x]Ti[sub 3]O[sub 12] (BLT)] were grown by a self-flux method. BLT (x=0.85) showed a smaller remanent polarization (2P[sub r]) along the a(b) axis of 41 μC/cm[sup 2] than 98 μC/cm[sup 2] for BiT, which mainly originates in its smaller ionic displacements along the a axis. Striped 90° domain walls as well as head-to-head and tail-to-tail 180° domain walls were observed for both crystals, and La substitution led to a marked decrease in the 90° domain width from 8.5 μm (BiT) to 2.5 μm for BLT (x=1.20). Piezoelectric-force microscope observations suggested that antiphase domain boundary (ADB) is present only for BLT and the ADB plays an important role in the formation of the 90° domain. © 2004 American Institute of Physics.
ACCESSION #
11805666

 

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