Defect engineering for control of polarization properties in SrBi 2Ta2O9

Yuji Noguchi; Masaru Miyayama; Kenichi Oikawa; Takashi Kamiyama; Minoru Osada; Masato Kakihana

doi:10.1143/JJAP.41.7062

Defect engineering for control of polarization properties in SrBi ₂Ta₂O₉

Yuji Noguchi, Masaru Miyayama, Kenichi Oikawa, Takashi Kamiyama, Minoru Osada, Masato Kakihana

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

110 Citations (Scopus)

Abstract

Defect engineering to design for remanent polarization (P_r) and coercive field (E_c) in SrBi₂Ta₂O₉ (SBT) is proposed. Cation vacancies coupled with substituents or oxide vacancies are shown to play an essential role in determining the polarization properties. High-resolution neutron powder diffraction studies revealed that trivalent-cation (Bi, La, and Nd) substitution induces Sr vacancies for the requirement of charge neutrality. Polarization measurements of dense ceramics indicated that Bi substitution led to an increase in 2 P_r and the 2P_r value for Sr_0.73Bi_2.18 Ta₂O ₉ was twice as large as that of SBT. Structural refinements revealed that Bi substitution enhances spontaneous polarization (P_s) and the improvement of P_s is responsible for the larger 2P_r observed. La substitution with Sr vacancies increased P_r slightly, but the 2E_c value (41 kV/cm) of La_0.33Sr _0.5Bi₂Ta₂O₉ was much smaller than that for SBT (57 kV/cm). Nd-substituted SBT showed almost the same P_r of La-SBT, while a high 2E_c (125 kV/cm) was attained for Nd _0.33Sr_0.5Bi₂Ta₂O₉. It is suggested that the higher E_c found in Nd-SBT is attributed to oxide vacancies produced by the substitution of a very small amount of Nd at the Ta site. Defect engineering is expected to open the way for the design of the polarization properties in SBT

Original language	English
Pages (from-to)	7062-7075
Number of pages	14
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	41
Issue number	11 B
DOIs	https://doi.org/10.1143/JJAP.41.7062
Publication status	Published - 2002 Nov
Externally published	Yes

Keywords

Coercive field
Defect
Defect engineering
Ferroelectric properties
Lattice distortion
Neutron diffraction
Remanent polarization
SrBiTaO
Vacancy

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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Defect engineering for control of polarization properties in SrBi ₂Ta₂O₉. / Noguchi, Yuji; Miyayama, Masaru; Oikawa, Kenichi; Kamiyama, Takashi; Osada, Minoru; Kakihana, Masato.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 41, No. 11 B, 11.2002, p. 7062-7075.

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

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title = "Defect engineering for control of polarization properties in SrBi 2Ta2O9",

abstract = "Defect engineering to design for remanent polarization (Pr) and coercive field (Ec) in SrBi2Ta2O9 (SBT) is proposed. Cation vacancies coupled with substituents or oxide vacancies are shown to play an essential role in determining the polarization properties. High-resolution neutron powder diffraction studies revealed that trivalent-cation (Bi, La, and Nd) substitution induces Sr vacancies for the requirement of charge neutrality. Polarization measurements of dense ceramics indicated that Bi substitution led to an increase in 2 Pr and the 2Pr value for Sr0.73Bi2.18 Ta2O 9 was twice as large as that of SBT. Structural refinements revealed that Bi substitution enhances spontaneous polarization (Ps) and the improvement of Ps is responsible for the larger 2Pr observed. La substitution with Sr vacancies increased Pr slightly, but the 2Ec value (41 kV/cm) of La0.33Sr 0.5Bi2Ta2O9 was much smaller than that for SBT (57 kV/cm). Nd-substituted SBT showed almost the same Pr of La-SBT, while a high 2Ec (125 kV/cm) was attained for Nd 0.33Sr0.5Bi2Ta2O9. It is suggested that the higher Ec found in Nd-SBT is attributed to oxide vacancies produced by the substitution of a very small amount of Nd at the Ta site. Defect engineering is expected to open the way for the design of the polarization properties in SBT",

keywords = "Coercive field, Defect, Defect engineering, Ferroelectric properties, Lattice distortion, Neutron diffraction, Remanent polarization, SrBiTaO, Vacancy",

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AU - Oikawa, Kenichi

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AU - Osada, Minoru

AU - Kakihana, Masato

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N2 - Defect engineering to design for remanent polarization (Pr) and coercive field (Ec) in SrBi2Ta2O9 (SBT) is proposed. Cation vacancies coupled with substituents or oxide vacancies are shown to play an essential role in determining the polarization properties. High-resolution neutron powder diffraction studies revealed that trivalent-cation (Bi, La, and Nd) substitution induces Sr vacancies for the requirement of charge neutrality. Polarization measurements of dense ceramics indicated that Bi substitution led to an increase in 2 Pr and the 2Pr value for Sr0.73Bi2.18 Ta2O 9 was twice as large as that of SBT. Structural refinements revealed that Bi substitution enhances spontaneous polarization (Ps) and the improvement of Ps is responsible for the larger 2Pr observed. La substitution with Sr vacancies increased Pr slightly, but the 2Ec value (41 kV/cm) of La0.33Sr 0.5Bi2Ta2O9 was much smaller than that for SBT (57 kV/cm). Nd-substituted SBT showed almost the same Pr of La-SBT, while a high 2Ec (125 kV/cm) was attained for Nd 0.33Sr0.5Bi2Ta2O9. It is suggested that the higher Ec found in Nd-SBT is attributed to oxide vacancies produced by the substitution of a very small amount of Nd at the Ta site. Defect engineering is expected to open the way for the design of the polarization properties in SBT

AB - Defect engineering to design for remanent polarization (Pr) and coercive field (Ec) in SrBi2Ta2O9 (SBT) is proposed. Cation vacancies coupled with substituents or oxide vacancies are shown to play an essential role in determining the polarization properties. High-resolution neutron powder diffraction studies revealed that trivalent-cation (Bi, La, and Nd) substitution induces Sr vacancies for the requirement of charge neutrality. Polarization measurements of dense ceramics indicated that Bi substitution led to an increase in 2 Pr and the 2Pr value for Sr0.73Bi2.18 Ta2O 9 was twice as large as that of SBT. Structural refinements revealed that Bi substitution enhances spontaneous polarization (Ps) and the improvement of Ps is responsible for the larger 2Pr observed. La substitution with Sr vacancies increased Pr slightly, but the 2Ec value (41 kV/cm) of La0.33Sr 0.5Bi2Ta2O9 was much smaller than that for SBT (57 kV/cm). Nd-substituted SBT showed almost the same Pr of La-SBT, while a high 2Ec (125 kV/cm) was attained for Nd 0.33Sr0.5Bi2Ta2O9. It is suggested that the higher Ec found in Nd-SBT is attributed to oxide vacancies produced by the substitution of a very small amount of Nd at the Ta site. Defect engineering is expected to open the way for the design of the polarization properties in SBT

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