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2008 Fiscal Year Final Research Report

Crystal Structure and Electronic Transport Properties of Chemically Modified Layered Cobalt Oxides

Research Project

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Project/Area Number 18360308
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionTohoku University

Principal Investigator

MIYAZAKI Yuzuru  Tohoku University, 大学院・工学研究科, 准教授 (40261606)

Co-Investigator(Kenkyū-buntansha) KAJITANI Tsuyoshi  東北大学, 大学院・工学研究科, 教授 (80134039)
YUBUTA Kunio  東北大学, 金属材料研究所, 助教 (00302208)
Project Period (FY) 2006 – 2008
Keywordsコバルト酸化物 / イオン交換 / 結晶構造 / 輸送特性 / 電荷秩序 / 複合結晶 / 格子ミスフィット / 超空間群
Research Abstract

ナトリウムコバルト酸化物およびイオン交換法によりナトリウムをカルシウム、ストロンチウムおよびバリウムで置換した層状コバルト酸化物を合成し、これらの陽イオン組成と結晶構造および輸送特性の関係を詳細に調べた。ナトリウム系では、特定の組成において、ナトリウムの規則配列を有する相が発見され、その規則配列が磁性や電気抵抗に影響を及ぼすことが確認された。またイオン交換をした系においても特定の組成で陽イオンの規則配列が見出され、これらの知見を積極的に活用することで、優れた熱電材料を設計するための指針が得られた。

  • Research Products

    (15 results)

All 2009 2008 2007 2006

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (9 results) Book (1 results)

  • [Journal Article] Synthesis, Crystal Structure and Physical Properties of Layered Cobalt Oxide Ca_xCoO_2(x-0.47)2009

    • Author(s)
      Y. Miyazaki, X.Y. Huang, T. Kajiwara, H. Yamane, T. Kajitani
    • Journal Title

      J.Ceram.Soc.Jpn 117

      Pages: 42-46

    • Peer Reviewed
  • [Journal Article] Disorder-order transitions in Na_xCoO_2(x-0.58)2008

    • Author(s)
      D. Igarashi, Y. Miyazaki, T. Kajitani, K. Yubuta
    • Journal Title

      Phys.Rev.B 78

      Pages: 184112-1-184112-6

    • Peer Reviewed
  • [Journal Article] Crystal Structure of Sr_<0.35>CoO_2Compound Studied by High-Resolution Electron Microscopy2007

    • Author(s)
      K. Yubuta, Y. Hasegawa, Y. Miyazaki, T. Kajitani
    • Journal Title

      Jpn.J.Appl.Phys. 46

      Pages: 712-715

    • Peer Reviewed
  • [Journal Article] Superspace Group Approach to the Crystal Structure of Na_<0.5>CoO_22007

    • Author(s)
      D. Igarashi, Y. Miyazaki, K. Yubuta, T. Kajitani
    • Journal Title

      Jpn.J.Appl.Phys. 46

      Pages: 304-310

    • Peer Reviewed
  • [Journal Article] 層状コバルト酸化物の結晶構造と熱電特性2006

    • Author(s)
      宮崎譲、舟橋良次
    • Journal Title

      セラミックス 41

      Pages: 178-182

    • Peer Reviewed
  • [Presentation] Aperiodic compounds as potential thermoelectric materials (Invited)2009

    • Author(s)
      Y. Miyazaki
    • Organizer
      33^<rd> Int'l Conf.and Expo.on Advanced Ceramics and Composites
    • Place of Presentation
      Daytona Beach,FL,USA
    • Year and Date
      2009-01-22
  • [Presentation] Na_xCoO_2におけるNa規則配列転移温度と組成の関係2008

    • Author(s)
      五十嵐大, 宮崎譲
    • Organizer
      応用物理学会東北支部第63回学術講演会
    • Place of Presentation
      仙台
    • Year and Date
      2008-12-04
  • [Presentation] Effects of Na atom ordering on the physical properties in Na_<0.58>CoO_22008

    • Author(s)
      D. Igarashi, Y. Miyazaki
    • Organizer
      27^<th> Int'l Conf.on Thermoelectrics(ICT2008)
    • Place of Presentation
      Corvallis,OR,USA
    • Year and Date
      2008-08-05
  • [Presentation] Aperiodic Cuprates and Cobaltates(Invited)2008

    • Author(s)
      Y. Miyazaki
    • Organizer
      Solid State Chemistry : Past & Future
    • Place of Presentation
      Birmingham,UK
    • Year and Date
      2008-04-18
  • [Presentation] Preparation, crystal structure and physical properties of α'-Na_xCoO_22008

    • Author(s)
      Y. Miyazaki
    • Organizer
      Zing Solid State Chemistry Conference
    • Place of Presentation
      Cancun,Mexico
    • Year and Date
      2008-03-12
  • [Presentation] Chemical tuning of the misfit-layered cobaltate [Ca_2CoO_3]_pCoO_2(Invited)2008

    • Author(s)
      Y. Miyazaki
    • Organizer
      32^<nd> Int'l Conf.and Expo.on Advanced Ceramics and Composites
    • Place of Presentation
      Daytona Beach,FL,USA
    • Year and Date
      2008-01-31
  • [Presentation] Na_<0.58.CoO_2の中間規則相2007

    • Author(s)
      五十嵐大, 宮崎譲
    • Organizer
      日本物理学会第62回年次大会
    • Place of Presentation
      札幌
    • Year and Date
      2007-09-21
  • [Presentation] The thermoelectric properties of α'-Na_xCoO_22007

    • Author(s)
      X.Y. Huang, Y. Miyazaki, T. Kajitani
    • Organizer
      26^<th> Int'l Conf.on Thermoelectrics(ICT2007)
    • Place of Presentation
      Jeju,South Korea
    • Year and Date
      2007-06-05
  • [Presentation] Crystal structure of Na_<0.5>CoO_2 : Nearly a commensurate misfit-layered cobalt oxide2006

    • Author(s)
      D. Igarashi, Y. Miyazaki
    • Organizer
      25^<th> Int'l Conf.on Thermoelectrics(ICT2006)
    • Place of Presentation
      Wien,Austria
    • Year and Date
      2006-08-08
  • [Book] 熱電変換技術ハンドブック2008

    • Author(s)
      宮崎譲
    • Total Pages
      223-229
    • Publisher
      (株)エヌ・ティー・エス

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Published: 2010-06-10   Modified: 2016-04-21  

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