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

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Abstract

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.

Original languageEnglish
Article number024110
JournalJournal of Applied Physics
Volume98
Issue number2
DOIs
Publication statusPublished - Jul 15 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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