The effects of neodymium content and site occupancy on spontaneous polarization of epitaxial (Bi 4-xNd x)Ti 3O 12 films

Takayuki Watanabe, Hiroshi Funakubo*, Minoru Osada, Hiroshi Uchida, Isao Okada

*この研究の対応する著者

研究成果: Article査読

28 被引用数 (Scopus)

抄録

Epitaxial (110) (Bi4-x Ndx) Ti3 O12 (x=0-0.73) films with a variety of neodymium content were grown by metal-organic chemical-vapor deposition, and the effects of neodymium content and site occupancy on spontaneous polarization along the a axis were systematically investigated. Raman spectra revealed that the neodymium is selectively substituted for the bismuth (A site) in the pseudoperovskite layer up to x=0.45; however, with further increasing neodymium content, neodymium is also incorporated into other bismuth sites in the (Bi2 O2) 2+ layer. The neodymium substitution led to a continuous decrease in the Curie temperature. The saturated coercive field showed slight dependency on the neodymium content, while the remanent polarization significantly improved to a maximum of 34 μC cm2 at x=0.35. The estimated value of the spontaneous polarization for the epitaxial films with x=0.26-0.45 exceeded 50 μC cm2, i.e., the reported value for pure Bi4 Ti3 O12 single crystal, but markedly decreased at x=0.73. The degraded spontaneous polarization appeared to be associated with the site occupancy of the neodymium at the two different kinds of bismuth sites.

本文言語English
論文番号024110
ジャーナルJournal of Applied Physics
98
2
DOI
出版ステータスPublished - 2005 7 15
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)
  • 物理学および天文学(全般)

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「The effects of neodymium content and site occupancy on spontaneous polarization of epitaxial (Bi <sub>4-x</sub>Nd <sub>x</sub>)Ti <sub>3</sub>O <sub>12</sub> films」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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