Approach for enhanced polarization of polycrystalline bismuth titanate films by Nd3+/V5+ cosubstitution

Hiroshi Uchida, Hiroki Yoshikawa, Isao Okada, Hirofumi Matsuda, Takashi Iijima, Takayuki Watanabe, Takashi Kojima, Hiroshi Funakubo

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)

Abstract

Thin films of Nd3+-substituted bismuth titanate, (Bi 4.00-y,Ndy)Ti3.00O12 (BNT), Nd 3+/V5+-cosubstituted bismuth titanate, (Bi 4.00-y,Ndy)(Ti3.00-xVx)O 12 (BNTV), and La3+-substituted bismuth titanate, (Bi 3.25,La0.75)Ti3.00O12 (BLT) were fabricated on the (111)Pt/Ti/SiO2/(100)Si substrates by a chemical solution deposition technique. These films possessed random-oriented polycrystalline structure. The BNT film had larger remnant polarization (P r) than the BLT film; Pr and coercive field (E c) of the BNT film with y=0.50 were 32 μC/cm2 and 126 kV/cm, respectively. Furthermore, V5+ substitution improved the Pr value of the BNT film up to 37 μC/cm2 (BNTV film; y=0.50, x=0.02), while the BNTV film had an Ec value of approximately 119 kV/cm which was similar to that of the BNT film. Ferroelectric properties of the Pb-free polycrystalline BNT and BNTV films are comparable with those of conventional Pb-based ferroelectric films like a lead zirconate titanate.

Original languageEnglish
Pages (from-to)2229-2231
Number of pages3
JournalApplied Physics Letters
Volume81
Issue number12
DOIs
Publication statusPublished - Sep 16 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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