Site definition and characterization of La-substituted Bi4Ti3O12 thin films prepared by metalorganic chemical vapor deposition

Takayuki Watanabe; Hiroshi Funakubo; Manabu Mizuhira; Minoru Osada

doi:10.1063/1.1417988

Site definition and characterization of La-substituted Bi₄Ti₃O₁₂ thin films prepared by metalorganic chemical vapor deposition

Takayuki Watanabe, Hiroshi Funakubo, Manabu Mizuhira, Minoru Osada

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

46 Citations (Scopus)

Abstract

The effects of La content on crystal structure and ferroelectric property of La-substituted Bi_4-xLa_xTi₃O₁₂ were investigated. We utilized as-deposited thin films prepared on (111)Pt/SiO₂/Si substrates at 680 °C by metalorganic chemical vapor deposition. The films showed (117) preferred orientation, and the lattice spacing of the (117) plane increased with increasing La content. With the aid of Raman spectroscopy, we found a pronounced site selectivity of La ions for the Bi site (A site) in the pseudoperovskite layer. Even for a small content (x=0.2), an incorporation of La ion into the pseudoperovskite layer greatly enhanced both remanent polarization and coercive field, but improved properties were almost irrespective of La content for x>0.2. For (Bi_3.27La_0.73)Ti₃O₁₂ thin film, we confirmed a good fatigue endurance up to 2×10¹⁰ switching cycles.

Original language	English
Pages (from-to)	6533-6535
Number of pages	3
Journal	Journal of Applied Physics
Volume	90
Issue number	12
DOIs	https://doi.org/10.1063/1.1417988
Publication status	Published - 2001 Dec 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physics and Astronomy (miscellaneous)

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title = "Site definition and characterization of La-substituted Bi4Ti3O12 thin films prepared by metalorganic chemical vapor deposition",

abstract = "The effects of La content on crystal structure and ferroelectric property of La-substituted Bi4-xLaxTi3O12 were investigated. We utilized as-deposited thin films prepared on (111)Pt/SiO2/Si substrates at 680 °C by metalorganic chemical vapor deposition. The films showed (117) preferred orientation, and the lattice spacing of the (117) plane increased with increasing La content. With the aid of Raman spectroscopy, we found a pronounced site selectivity of La ions for the Bi site (A site) in the pseudoperovskite layer. Even for a small content (x=0.2), an incorporation of La ion into the pseudoperovskite layer greatly enhanced both remanent polarization and coercive field, but improved properties were almost irrespective of La content for x>0.2. For (Bi3.27La0.73)Ti3O12 thin film, we confirmed a good fatigue endurance up to 2×1010 switching cycles.",

author = "Takayuki Watanabe and Hiroshi Funakubo and Manabu Mizuhira and Minoru Osada",

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AU - Watanabe, Takayuki

AU - Funakubo, Hiroshi

AU - Mizuhira, Manabu

AU - Osada, Minoru

PY - 2001/12/15

Y1 - 2001/12/15

N2 - The effects of La content on crystal structure and ferroelectric property of La-substituted Bi4-xLaxTi3O12 were investigated. We utilized as-deposited thin films prepared on (111)Pt/SiO2/Si substrates at 680 °C by metalorganic chemical vapor deposition. The films showed (117) preferred orientation, and the lattice spacing of the (117) plane increased with increasing La content. With the aid of Raman spectroscopy, we found a pronounced site selectivity of La ions for the Bi site (A site) in the pseudoperovskite layer. Even for a small content (x=0.2), an incorporation of La ion into the pseudoperovskite layer greatly enhanced both remanent polarization and coercive field, but improved properties were almost irrespective of La content for x>0.2. For (Bi3.27La0.73)Ti3O12 thin film, we confirmed a good fatigue endurance up to 2×1010 switching cycles.

AB - The effects of La content on crystal structure and ferroelectric property of La-substituted Bi4-xLaxTi3O12 were investigated. We utilized as-deposited thin films prepared on (111)Pt/SiO2/Si substrates at 680 °C by metalorganic chemical vapor deposition. The films showed (117) preferred orientation, and the lattice spacing of the (117) plane increased with increasing La content. With the aid of Raman spectroscopy, we found a pronounced site selectivity of La ions for the Bi site (A site) in the pseudoperovskite layer. Even for a small content (x=0.2), an incorporation of La ion into the pseudoperovskite layer greatly enhanced both remanent polarization and coercive field, but improved properties were almost irrespective of La content for x>0.2. For (Bi3.27La0.73)Ti3O12 thin film, we confirmed a good fatigue endurance up to 2×1010 switching cycles.

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