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Growth of new ferroelectric K5Nb9O25 crystal and its properties

Research Project

Project/Area Number 16K04949
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Crystal engineering
Research InstitutionYamaguchi University

Principal Investigator

Komatsu Ryuichi  山口大学, 大学院創成科学研究科, 教授 (20314817)

Co-Investigator(Kenkyū-buntansha) 麻川 明俊  山口大学, 大学院創成科学研究科, 助教 (90757337)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords結晶成長 / 強誘電体 / 非鉛系圧電材料 / 固溶体幅 / 一致溶融化合物 / 相平衡図 / 固溶体 / タングステンブロンズ / 構造解析 / 高温その場観察 / 針状結晶 / 高温DSC / 相図 / 結晶育成 / 電子・電気材料 / 不一致融解化合物
Outline of Final Research Achievements

Fundamental properties of nobel ferroelectric K5Nb9O25 phase has been investigated for growth of K5Nb9O25 single crystal. It is revealed that this material has solid solution range up to 7mol%, and that the solid solution swells out in the niobium side from the stoichiometric composition. In addition, in-situ observation indicates that this material melts congruently.
K5Nb9O25 crystals were grown by flux growth method and melt growth method, respectively, and compared by XRD and microscope so on. Both of grown crystals show acicular, and the surface showed deterioration in a one-month exposure test. This indicated strongly that the potential applications of this material are small. Also, it may be considered that the growth of this crystal frowm the melt is difficlt because of selective evaporation of potassium from the melt.

Academic Significance and Societal Importance of the Research Achievements

非鉛系圧電材料として注目されているK2O-Nb2O5系の新しい強誘電体相K5Nb9O25の基礎的材料特性及び結晶育成可能性を調べた。その結果この相は従来報告されていない固溶体幅を持つ等の新しいことを見出した。さらに結晶育成の可能性について検討し、一致溶融化合物であることを初めて突き止めた。しかし融液からの結晶育成は融液からの特定元素の蒸発でうまくいかなかった。非鉛系圧電材料は長期間検討されているが、この系ではニオブ酸カリウム以外は難しく、効率的な成果を上げるためには別な系での研究をすべきである。また特定元素蒸発を抑制するための研究は新しい市場を開拓できる可能性があり、有望と推定された。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2018 2017

All Journal Article (3 results) (of which Peer Reviewed: 2 results) Presentation (2 results)

  • [Journal Article] マイクロ引き下げ法を用いた透明ファイバー状四ほう酸ストロンチウム結晶の育成2018

    • Author(s)
      町田貴明,稲葉祥,麻川明俊,小松隆一
    • Journal Title

      Journal of the Society of Inorganic Materials, Japan

      Volume: 25 Pages: 4-9

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
  • [Journal Article] Growth of transparent SrB4O7 crystal fiber by the μ-PD method2017

    • Author(s)
      akaaki Machida, Sho Inaba, Maki Ueda, Harutoshi Asakawa,Ryuichi Komatsu
    • Journal Title

      Transaction of the Materials Research Society of Japan

      Volume: 42(3) Pages: 66-68

    • NAID

      130006943321

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of temperature gradient on growth of SrB4O7 crystals by the micro-pulling-down method2017

    • Author(s)
      Sho Inaba, Takaaki Machida, Harutoshi Asakawa, Ryuichi Komatsu
    • Journal Title

      Transaction of the Materials Research Society of Japan

      Volume: 42(5) Pages: 123-126

    • NAID

      130006110887

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Novel phases, K5Nb9O25 and K2Nb8O21, in the K2O-Nb2O5 syste2018

    • Author(s)
      栗本恵里, 麻川明俊, 小松隆一
    • Organizer
      第28回日本MRS年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] KNbO3-Nb2O5系のK5Nb9O25相周辺の相図と結晶育成2017

    • Author(s)
      栗本恵理、上田 真紀、麻川 明俊 小松 隆一
    • Organizer
      応用物理学会中国四国支部年会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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