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Ferroelectric properties of sol-gel prepared La- and Nd-substituted, and Nb-co-substituted bismuth titanate using polymeric additives

Title
Ferroelectric properties of sol-gel prepared La- and Nd-substituted, and Nb-co-substituted bismuth titanate using polymeric additives
Authors
Kim J.Kim J.K.Heo S.Lee H.S.
Ewha Authors
김진흥
SCOPUS Author ID
김진흥scopus
Issue Date
2006
Journal Title
Thin Solid Films
ISSN
0040-6090JCR Link
Citation
Thin Solid Films vol. 503, no. 1-2, pp. 60 - 63
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
La- or Nd-substituted bismuth titanate (BLT or BNT) and Nb-cosubstituted bismuth titanate (Nb-BLT or Nb-BNT) thin films were prepared in the presence of nonionic surfactants, poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (EOxPOyEOx) triblock copolymers, added as additives to the sol solution. For Nb-BLT films prepared with EO106PO70EO106, the (200) orientation relative to (117) was dominant as compared with Nb-BLT films produced without surfactant or with EO20PO70EO 20, and the remanent polarization (Pr) of the Nb-BLT film was 22 μC/cm2, which was superior to 10 and 15 μC/cm 2 of Nb-BLT films prepared without surfactant or with EO 20PO70EO20. The additional Nb cosubstitution in BLT and BNT affected particle orientation in the films and resulted in higher ferroelectricity than those of the BLT and BNT films. The Nb-BNT/EO 106PO70EO106 film showed the best ferroelectric properties; its remanent polarization was 30 μC/cm2 and the polarization (P*-P∧) shows no significant change up to 8 × 108 switching cycles. © 2005 Elsevier B.V. All rights reserved.
DOI
10.1016/j.tsf.2005.11.050
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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