Synthesis and ferroelectric properties of Sr- and Nb-codoped Bi4-xSrxTi3-xNbxO12 thin films by sol-gel method

Hirofumi Matsuda, Takashi Iijima, Hiroshi Uchida, Isao Okada, Takayuki Watanabe, Hiroshi Funakubo

Research output: Contribution to journalConference articlepeer-review

Abstract

Ferroelectric Bi4Ti3O12 (BIT) thin films were modified by the substitution of Sr2+ ions for Bi3+ ions and of Nb5+ for Ti4+ (codoping) by spin-coating and decomposition of chemical solutions of metal-alkoxide materials (the nominal compositions of Bi4-xSrxTi3-xNbxO12 where x = 0.0, 0.5, 1.0, 1.5). Single-phase thin films were crystallized above 550°C with BIT-type structure. The ferroelectric properties were found, though, with the values of Pr = 10 μC/cm2, Ec = 100 kV/cm, εr = 300, and tanδ<5% for Bi3.5Sr0.5Ti2.5Nb0.5O12 (x = 0.5) annealed at 650°C. Perhaps due to the lowering of the Curie temperature with increasing x, the maximum value of εr increased.

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Volume688
Publication statusPublished - Jan 1 2002
Externally publishedYes
EventFerroelectric Thin Films X - Boston, MA, United States
Duration: Nov 25 2001Nov 29 2001

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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