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Synthesis and Ferroelectric Properties of Sr- and Nb-codoped Bi4−xSrxTi3−xNbxO12 Thin Films by Sol-Gel Method

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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 δr increased.

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Authors and Affiliations

  1. Smart Struct. Res. Center, Natnl. Inst. Adv. Indust. Sci. Tech. (AIST), 1-1-1 Umezono, Tsukuba, 305-8568, Japan

    Hirofumi Matsuda & Takashi Iijima

  2. Dept. Chem., Sophia Univ., Tokyo, 102-8554, Japan

    Hiroshi Uchida & Isao Okada

  3. Dept. Innov. Eng. Mater., Tokyo Inst. Tech., Yokohama, 226-8502, Japan

    Takayuki Watanabe & Hiroshi Funakubo

Authors
  1. Hirofumi Matsuda
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  2. Takashi Iijima
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  3. Hiroshi Uchida
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  4. Isao Okada
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  5. Takayuki Watanabe
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  6. Hiroshi Funakubo
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Matsuda, H., Iijima, T., Uchida, H. et al. Synthesis and Ferroelectric Properties of Sr- and Nb-codoped Bi4−xSrxTi3−xNbxO12 Thin Films by Sol-Gel Method. MRS Online Proceedings Library 688, 4141 (2001). https://doi.org/10.1557/PROC-688-C4.14.1

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  • DOI: https://doi.org/10.1557/PROC-688-C4.14.1

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