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Exploration of novel fluoride anion conductors with rigid frameworks

Research Project

Project/Area Number 21K04659
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26020:Inorganic materials and properties-related
Research InstitutionKindai University

Principal Investigator

Oka Kengo  近畿大学, 理工学部, 講師 (80602044)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsフッ化物イオン伝導体 / 複合アニオン化合物 / 酸フッ化物 / ビスマス / 鉛 / フッ化物イオン伝導 / 層状構造 / フッ化物イオン / イオン伝導 / 層状化合物 / アパタイト / 構造相転移 / 負熱膨張 / 複合アニオン / トポタクティックな反応 / リートベルト解析
Outline of Research at the Start

酸フッ化物におけるフッ化物イオン伝導特性について研究を行う。特にPbやBiの有する6s2孤立電子対の存在がフッ化物イオン伝導性に大きな影響を与えている可能性に着目し、Pb/Bi含有酸フッ化物の合成とイオン伝導性の評価を行う。結晶構造を精密に構造解析することにより、酸フッ化物におけるフッ化物イオン伝導性およびそれに寄与するPbやBiの持つ6s2孤立電子対の効果を明らかにしていく。

Outline of Final Research Achievements

Fluoride anion conductors with rigid frameworks were investigated. We focused mainly on compounds containing Pb and Bi. The oxyfluoride Bi2VO5F has been reported as a fluoride anion conductor. While this material has been conventionally synthesized by solid-phase reactions, we have found that it can be synthesized at low temperatures and in a very short time by a topotactic fluorination reaction based on the oxide Bi4V2O11. We have also experimentally confirmed that this property is due to the high fluoride anion conductivity. For the apatite-type compound Pb5(VO4)3F, it was also found that the fluoride ionic non-stoichiometry exists, and that the fluoride ionic conductivity is expected to derive from this non-stoichiometry.

Academic Significance and Societal Importance of the Research Achievements

本研究では、安定かつ強固な酸化物骨格を持った化合物におけるフッ化物イオン伝導特性に着目して研究を行った。フッ化物イオン伝導体は、新しいフッ化物イオン二次電池に必要な材料として注目を集めている。従来は、フッ化物イオンのみをもつ化合物が正極材料として着目されていたが、フッ化物イオンの脱離吸収過程における化学的安定に問題がった。本研究で見いだしたBi2VO5FおよびPb5(VO4)3Fは、安定な酸素骨格を持ち、フッ素の脱離吸収の繰り返しに関して安定である。PbやBiは6s孤立電子対を安定的に有する元素であり、その特性が安定的なフッ化物イオンの保持に寄与している可能性が期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2021

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Site preference of fluoride anion and potential ionic conductivity in fluorapatites <i>A</i><sub>5</sub>(VO<sub>4</sub>)<sub>3</sub>F (<i>A</i> = Pb, Sr, and Ba)2022

    • Author(s)
      OKA Kengo、NISHIKI Wataru、TAKASU Miho、NOMA Naoki、IWASAKI Mitsunobu
    • Journal Title

      Journal of the Ceramic Society of Japan

      Volume: 130 Issue: 1 Pages: 35-38

    • DOI

      10.2109/jcersj2.21092

    • NAID

      130008139169

    • ISSN
      1348-6535, 1882-0743
    • Year and Date
      2022-01-01
    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Anionic order in Pb2Ti4O9F2 Revisited by nuclear magnetic resonance and density functional theory2022

    • Author(s)
      Oka Kengo、Ichibha Tom、Kato Daichi、Noda Yasuto、Tominaga Yusuke、Yamada Kosei、Iwasaki Mitsunobu、Noma Naoki、Hongo Kenta、Maezono Ryo、Reboredo Fernando A.
    • Journal Title

      Dalton Transactions

      Volume: 51 Issue: 40 Pages: 15361-15369

    • DOI

      10.1039/d2dt00839d

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Negative Thermal Expansion in Fluoroapatite Pb<sub>5</sub>(VO<sub>4</sub>)<sub>3</sub>F Enhanced by the Steric Effect of Pb<sup>2+</sup>2022

    • Author(s)
      Oka Kengo、Takasu Miho、Nishiki Wataru、Nishikubo Takumi、Azuma Masaki、Noma Naoki、Iwasaki Mitsunobu
    • Journal Title

      Inorganic Chemistry

      Volume: 61 Issue: 32 Pages: 12552-12558

    • DOI

      10.1021/acs.inorgchem.2c01300

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Exploring novel functional properties arose from anion order in mixed anion compounds2021

    • Author(s)
      OKA Kengo
    • Journal Title

      Journal of the Ceramic Society of Japan

      Volume: 129 Issue: 9 Pages: 555-560

    • DOI

      10.2109/jcersj2.21070

    • NAID

      130008082630

    • ISSN
      1348-6535, 1882-0743
    • Year and Date
      2021-09-01
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Bi2VO5F の合成とフッ化挙動の解明2023

    • Author(s)
      水谷 博香・野間 直樹・岡 研吾・岩崎 光伸
    • Organizer
      日本セラミックス協会 第36回秋季シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 新物質 SrBi3O5F の合成および構造解析2023

    • Author(s)
      澤田 康平・野間 直樹・岡 研吾 ・岩崎 光伸
    • Organizer
      日本セラミックス協会 第36回秋季シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 新物質SrBi3 O 5Fの合成および構造解析2023

    • Author(s)
      澤田康平,岡 研吾,岩崎光伸
    • Organizer
      色材研究発表会2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] Spin reorientation in layered perovskite oxyfluoride Pb3Fe2O5F22023

    • Author(s)
      K. Oka, Y. Nambu, M. Ochi, N. Hayashi, Y. Kusano, T. Aoyama, Y. Ishii, K. Kuroki, S. Mori, M. Takano, N. Noma, M. Iwasaki and H. Kageyama
    • Organizer
      Adv. Materials Science 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] アパタイト構造物質の組成制御における結晶構造解析とイオン伝導特性2021

    • Author(s)
      西木 渉・岡 研吾・岩崎 光伸
    • Organizer
      日本セラミックス協会関西支部第15回 学術講演会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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