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
| 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 | |
| Publication status | Published - 2002 Nov |
| Externally published | Yes |
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Keywords
- Coercive field
- Defect
- Defect engineering
- Ferroelectric properties
- Lattice distortion
- Neutron diffraction
- Remanent polarization
- SrBiTaO
- Vacancy
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
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
}
TY - JOUR
T1 - Defect engineering for control of polarization properties in SrBi 2Ta2O9
AU - Noguchi, Yuji
AU - Miyayama, Masaru
AU - Oikawa, Kenichi
AU - Kamiyama, Takashi
AU - Osada, Minoru
AU - Kakihana, Masato
PY - 2002/11
Y1 - 2002/11
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
KW - Coercive field
KW - Defect
KW - Defect engineering
KW - Ferroelectric properties
KW - Lattice distortion
KW - Neutron diffraction
KW - Remanent polarization
KW - SrBiTaO
KW - Vacancy
UR - http://www.scopus.com/inward/record.url?scp=0042159487&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0042159487&partnerID=8YFLogxK
U2 - 10.1143/JJAP.41.7062
DO - 10.1143/JJAP.41.7062
M3 - Article
VL - 41
SP - 7062
EP - 7075
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 11 B
ER -