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Exploring of a new quantum ferroelectric caused by tetrahedral network structures

Research Project

Project/Area Number 17K14323
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics I
Research InstitutionOsaka Prefecture University

Principal Investigator

Ishii Yui  大阪府立大学, 工学(系)研究科(研究院), 助教 (50708013)

Research Collaborator Kawaguchi Shogo  
Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords間接型強誘電体 / 強誘電体 / 構造揺らぎ / 量子常誘電体 / ソフトモード / 構造相転移 / 誘電体 / 量子常誘電性
Outline of Final Research Achievements

We focused on a new ferroelectric materials Ba1-xSrxAl2O4 and investigated structural fluctuation caused by suppression of the ferroelectric phase transition in terms of structural analyses and macroscopic physical properties. By means of structural analyses and characterization of macroscopic physical properties, we clarified that this system exhibits glass-like features in its lattice heat capacity which are unusual in crystalline solids.

Academic Significance and Societal Importance of the Research Achievements

本研究では,これまで研究例が少ない酸素四面体を基本とする新規強誘電体に注目し,強誘電転移の抑制によって生じる構造揺らぎの特徴と,構造揺らぎがマクロ物性に与える影響を調べた.その結果,2.5 K以下の低温で過剰な格子比熱が生じており,非晶質固体において従来知られている過剰比熱の特徴と非常によく類似していることがわかった.放射光を用いた単結晶X線回折の結果からは,本系では結晶の周期性を維持したまま,骨格構造の乱れに起因した短距離相関を形成していることが明らかになった.本結果は,結晶性固体においてそれと相反する非晶質的な性質が見られていることを意味し,学術的に大きな意義をもつと考える.

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (25 results)

All 2019 2018 2017

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 1 results) Presentation (18 results) (of which Int'l Joint Research: 9 results)

  • [Journal Article] Structural Phase Transition of a Novel Ferroelectric Oxide BaAl<sub>2</sub>O<sub>4</sub>2018

    • Author(s)
      石井悠衣
    • Journal Title

      Materia Japan

      Volume: 57 Issue: 8 Pages: 381-386

    • DOI

      10.2320/materia.57.381

    • NAID

      130007429122

    • ISSN
      1340-2625, 1884-5843
    • Year and Date
      2018-08-01
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Incommensurate phase of the stuffed tridymite derivative BaSrFe 4 O 82018

    • Author(s)
      Ishii Y.、Kawaguchi S.、Asai K.、Mori S.
    • Journal Title

      Journal of Solid State Chemistry

      Volume: 265 Pages: 314-318

    • DOI

      10.1016/j.jssc.2018.06.007

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magnetic anisotropy and magnetic textures in La1-xSrxMnO3 controlled by annealing2018

    • Author(s)
      A. Kotani, H. Nakajima, K. Harada, Y. Ishii, and S. Mori
    • Journal Title

      J. Mag. Mag. Mater.

      Volume: 464 Pages: 56-60

    • DOI

      10.1016/j.jmmm.2018.05.022

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Unusual Inhomogeneous Microstructures in Charge-Glass State of PbCrO32018

    • Author(s)
      K. Kurushima, H. Tsukasaki, T. Ogata, Y. Sakai, M. Azuma, Y. Ishii, and S. Mori
    • Journal Title

      Jpn. J. Appl. Phys.

      Volume: 57 Issue: 5 Pages: 050301-050301

    • DOI

      10.7567/jjap.57.050301

    • NAID

      210000149030

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Structural investigation of the SrAl2O4-BaAl2O4 solid solution system with unstable domain walls2017

    • Author(s)
      Y. Ishii, H. Tsukasaki, S. Kawaguchi, Y. Ouchi, and S. Mori
    • Journal Title

      Journal of Solid State Chemistry

      Volume: 249 Pages: 149-153

    • DOI

      10.1016/j.jssc.2017.03.002

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Field-temperature phase diagram of magnetic bubbles spanning charge/orbital ordered and metallic phases in La1-xSrxMnO3 (x = 0.125)2017

    • Author(s)
      A. Kotani, H. Nakajima, Y. Ishii, K. Harada and S. Mori
    • Journal Title

      Physical Review B

      Volume: 95 Issue: 14 Pages: 1444031-7

    • DOI

      10.1103/physrevb.95.144403

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Direct observation of charged domain walls in hybrid improper ferroelectric (Ca,Sr)3Ti2O72017

    • Author(s)
      K. Kurushima, W. Yoshimoto, Y. Ishii, S-W. Cheong, and S. Mori
    • Journal Title

      Jpn. J. Appl. Phys.

      Volume: 56

    • NAID

      210000148349

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 充填トリジマイト型酸化物Ba0.93Sr0.07Al2O4の構造不安定性2019

    • Author(s)
      石井 悠衣、大内 雄也、河口 彰吾、石橋 広記、久保田 佳基、森 茂生
    • Organizer
      2019年日本物理学会年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Structural Instability of Ba1-xSrxAl2O4 (x=0.07) on the border of ferroelectricity2018

    • Author(s)
      Y. Ouchi, Y. Ishii, Y. Okazaki, S. Kawaguchi, H. Ishibashi, Y. Kubota, and S. Mori
    • Organizer
      2018 ISAF-FMA-AMF-AMEC-PFM Joint Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Structure Fluctuation and Soft Phonon Modes in Improper Ferroelectric BaAl2O4 by Single Crystal X-ray Diffraction2018

    • Author(s)
      Y. Nakahira, C. Moriyoshi, Y. Kuroiwa, H. Moriwake, Y. Ishii and S. Mori
    • Organizer
      2018 ISAF-FMA-AMF-AMEC-PFM Joint Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Crystal Structure and Magnetic Properties of Oxyfluorides (Co, Ni)3Sb4O6F62018

    • Author(s)
      S. Shimono, H. Ishibashi, Y. Ishii, N. Otsuki, S. Kawaguchi, S. Mori, Y. Kubota
    • Organizer
      The 21st International Conference on Magnetism (ICM2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magnetocrystalline anisotropy and magnetic microstructures in the ferromagnetic phase of Nd0.7Sr0.3MnO32018

    • Author(s)
      Y. Fujibayashi, A. Kotani, K. Harada, Y. Ishii, S. Mori
    • Organizer
      The 21st International Conference on Magnetism (ICM2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 強誘電相境界におけるBa1-xSrxAl2O4の構造不安定性2018

    • Author(s)
      大内 雄也、石井 悠衣、河口 彰吾、石橋 広記、久保田 佳基、森 茂生
    • Organizer
      日本セラミックス協会第31回秋季シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] Magnetic textures in La1-xSrxMnO3 (0.10 < x < 0.30)2018

    • Author(s)
      A. Kotani, M. Fujibayashi, H. Nakajima, K. Harada, Y. Ishii and S. Mori
    • Organizer
      The 10th APCTP Workshop on Multiferroics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magnetic microstructure in large magnetostrictive FeGa alloy2018

    • Author(s)
      A. Kawaguchi, A. Kotani, K. Harada, H. Numakura, Y. Ishii, and S. Mori
    • Organizer
      The 10th APCTP Workshop on Multiferroics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] HAADF-STEM法によるPbMnO3の微視的構造解析2018

    • Author(s)
      久留島康輔,酒井雄樹,東正樹,石井悠衣,森茂生
    • Organizer
      日本顕微鏡学会第74回学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 充填トリジマイト型酸化物Ba1-xSrxAl2O4のX線熱散漫散乱測定2018

    • Author(s)
      石井 悠衣, 大内 雄也, 岡崎 湧一, 河口 彰吾, 石橋 広記, 久保田 佳基, 森 茂生
    • Organizer
      日本物理学会年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Magnetic textures in the ferromagnetic insulating phase of La0.875Sr0.125MnO32018

    • Author(s)
      A. Kotani, H. Nakajima, K. Harada,Y. Ishii, S. Mori
    • Organizer
      The 42nd International Conference and Expo on Advanced Ceramics and Composites
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 充填トリジマイト型酸化物Ba1-xSrxAl2O4の特異な構造揺らぎ2017

    • Author(s)
      石井 悠衣, 大内 雄也, 岡崎 湧一, 河口 彰吾, 塚崎 裕文, 谷口 泰樹, 森 茂生
    • Organizer
      日本セラミック協会
    • Related Report
      2017 Research-status Report
  • [Presentation] Structural Fluctuation in the Stuffed Tridymite-type Oxides Ba1-xSrxAl2O42017

    • Author(s)
      Yui Ishii
    • Organizer
      6th Toyota RIKEN International Workshop
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 特異な構造揺らぎをもつ充填トリジマイト型酸化物Ba1-xSrxAl2O4のTEM観察2017

    • Author(s)
      大内 雄也, 石井 悠衣, 塚崎 裕文, 河口 彰吾, 森 茂生
    • Organizer
      日本結晶学会年会
    • Related Report
      2017 Research-status Report
  • [Presentation] BaSrFe4O8の低温相と高温相の構造解析2017

    • Author(s)
      岡崎 湧一, 石井 悠衣, 河口 彰吾, 浅井 海成, 森 茂生
    • Organizer
      日本結晶学会年会
    • Related Report
      2017 Research-status Report
  • [Presentation] On the microstructure in the charge-glass state of Pb1-xSrxCrO32017

    • Author(s)
      K. Kurushima, H. Tsukasaki, Y. Ishii, S. Mori, S. Ogata , M. Azuma
    • Organizer
      The 14th International Meeting on Ferroelectricity
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] PbCrO3における電荷ガラス状態の構造解析2017

    • Author(s)
      久留島康輔, 尾形昴洋, 東正樹, 石井悠衣, 森茂生
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] コバルト酸フッ化物Co3(Sb,Bi)4O6F6の合成と精密結晶構造解析2017

    • Author(s)
      下野聖矢, 石橋広記, 石井悠衣, 河口彰吾, 森茂生, 久保田佳基
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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