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

被引：14
作者：
Kim, J [1 ]
Kim, JK
Heo, S
Lee, HS
机构：
[1] Ewha Womans Univ, Dept Chem, Div Nano Sci, Seoul 120750, South Korea
[2] Changwon Natl Univ, Dept Chem Technol, Inst Basic Sci, Chang Won 641773, South Korea
[3] Changwon Natl Univ, Dept Phys, Inst Basic Sci, Chang Won 641773, South Korea
来源：
THIN SOLID FILMS | 2006年 / 503卷 / 1-2期
关键词：
substituted bismuth titanate; sol-gel; ferroelectric properties; non ionic surfactant;
D O I：
10.1016/j.tsf.2005.11.050
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 EO20PO70EO20, and the remanent polarization (P-r) of the Nb-BLT film was 22 mu C/cm(2), which was superior to 10 and 15 mu C/cm(2) of Nb-BLT films prepared without surfactant or with EO20PO70EO20. 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/EO106PO70EO106 film Showed the best ferroelectric properties; its remanent polarization was 30 mu C/cm(2) and the polarization (P*-P<^>) shows no significant change up to 8 x 10(8) switching cycles. (c) 2005 Elsevier B.V. All rights reserved.
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页码：60 / 63
页数：4
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