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

doi:10.1063/1.1507839

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 journal › Article › peer-review

160 Citations (Scopus)

Abstract

Thin films of Nd³⁺-substituted bismuth titanate, (Bi _4.00-y,Nd_y)Ti_3.00O₁₂ (BNT), Nd ³⁺/V⁵⁺-cosubstituted bismuth titanate, (Bi _4.00-y,Nd_y)(Ti_3.00-xV_x)O ₁₂ (BNTV), and La³⁺-substituted bismuth titanate, (Bi _3.25,La_0.75)Ti_3.00O₁₂ (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; P_r 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 P_r value of the BNT film up to 37 μC/cm² (BNTV film; y=0.50, x=0.02), while the BNTV film had an E_c 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 language	English
Pages (from-to)	2229-2231
Number of pages	3
Journal	Applied Physics Letters
Volume	81
Issue number	12
DOIs	https://doi.org/10.1063/1.1507839
Publication status	Published - Sep 16 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.1507839

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Approach for enhanced polarization of polycrystalline bismuth titanate films by Nd³⁺/V⁵⁺ cosubstitution. / Uchida, Hiroshi; Yoshikawa, Hiroki; Okada, Isao; Matsuda, Hirofumi; Iijima, Takashi; Watanabe, Takayuki; Kojima, Takashi; Funakubo, Hiroshi.

In: Applied Physics Letters, Vol. 81, No. 12, 16.09.2002, p. 2229-2231.

Research output: Contribution to journal › Article › peer-review

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title = "Approach for enhanced polarization of polycrystalline bismuth titanate films by Nd3+/V5+ cosubstitution",

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.",

author = "Hiroshi Uchida and Hiroki Yoshikawa and Isao Okada and Hirofumi Matsuda and Takashi Iijima and Takayuki Watanabe and Takashi Kojima and Hiroshi Funakubo",

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