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Resonant echo study on ion dynamics in superionic conductors

Research Project

Project/Area Number 15540315
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics I
Research InstitutionThe University of Tokushima

Principal Investigator

NAKAMURA Koichi  The University of Tokushima, Dept.of Physics, lecturer, 工学部, 講師 (20284317)

Co-Investigator(Kenkyū-buntansha) MORIGA Toshihiro  The University of Tokushima, Dept.of Chemical Science and Technology, Assistant Prof., 工学部, 助教授 (90239640)
MICHIHIRO Yoshitaka  The University of Tokushima, Dept.of Physics, Assistant Prof., 工学部, 助教授 (00174061)
KANASHIRO Tatsuo  The University of Tokushima, Dept of Physics, Professor, 工学部, 教授 (50035606)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsPhonon echo method / LiNbO_3 / Lithium ionic diffusion / LiCuO_2 / Li_xV_2O_5 / NMR / フェノンエコー
Research Abstract

Two-pulse phonon echo measurements were performed in the micro particles of polycrystalline and single crystalline LiNbO_3 from room temperature to 900 K to investigate the relationship between lithium ionic diffusion and decay time, T2, in the phonon echo. The decay time was dependent on temperature, showing a rapid decrease above 800 K in the polycrystalline sample. The origin of this anomaly is interpreted in terms of a simple Debye-type relaxation due to the lithium ionic diffusion. The activation energy of the lithium ionic diffusion was evaluated to be 0.93 eV in the polycrystalline samples, which is comparable with reported values from ionic conductivity and NMR results. On the other hand, single crystalline LiNbO_3 showed no sign of lithium ionic diffusion up to 900 K. The contribution to T_2 from the lithium ionic diffusion would be dominant at higher temperatures than 900 K because of much higher activation energy in the single crystalline sample. These facts show that the decay time in the phonon echo is strongly connected with ionic diffusion in the particles.
Li^+ ionic diffusion was observed in lithium transition-metal oxides, LiCuO_2 and Li_xV_2O_5 using NMR technique. The activation energy of LiCuO2 is comparable with that of in LiCoO_2. In Li_xV_2O_5, the large activation energy beyond 0.5 eV, which might arose from the phase transition among of ε, δ and γ-phase at high temperatures, was observed.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (13 results)

All 2005 2004

All Journal Article (13 results)

  • [Journal Article] NMR study on the Li^+ ion diffusion in LiCuO_2 with layered structure2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      Solid State Ionics 176

      Pages: 837-840

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Phonon echo study on lithium tonic diffusion in LiNbO_3 powder2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      Japanese Journal of Applied Physics (未定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] NMR Study on Li^+ Ionic Diffusion in Li_xV_2O_5 Prepared by Solid State Reaction2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      The proceedings of The 1st International Discussion Meeting on Superionic Conductor Physics (未定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] フォノンエコー法によるLiNbO_3におけるイオン拡散の観測2005

    • Author(s)
      中村浩一 他
    • Journal Title

      超音波テクノ (未定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Phonon echo study on lithium ionic diffusion in LiNbO_3 powder2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      Japanese Journal of Applied Physics (in press)

    • NAID

      10016441861

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] NMR Study on Li^+ Ionic Diffusion in Li_xV_2O_5 Prepared by Solid-State Reaction2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      The proceedings of The 1st International Discussion Meeting on Superionic Conductor Physics (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Observation of ionic diffusion in LiNbO_3 by phonon echo method (in Japanese)2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      Cho-onpa Thechno (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] フォノンエコー法によるLiNbO_3におけるイオン拡散の観測2005

    • Author(s)
      中村浩一他
    • Journal Title

      超音波テクノ 未定

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Phonon echo study on lithium ionic diffusion in LiNbO_3 powder2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      Japanese Journal of Applied Physics 未定

    • NAID

      10016441861

    • Related Report
      2004 Annual Research Report
  • [Journal Article] NMR Study on Li^+ Ionic Diffusion in Li_xV_2O_5 Prepared by Solid-State Reaction2005

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      The proceedings of The 1st International Discussion Meeting on Superionic Conductor Physics 未定

    • Related Report
      2004 Annual Research Report
  • [Journal Article] NMRからみた超イオン伝導体のイオン拡散挙動2004

    • Author(s)
      中村浩一 他
    • Journal Title

      日本結晶学会誌 (未定)

      Pages: 399-406

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Ionic Diffusion in Superionic Conductors viewed from NMR Spectroscopy (in Japanese)2004

    • Author(s)
      Koichi Nakamura et al.
    • Journal Title

      Nihon kessho gakkaishi 46

      Pages: 399-406

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] NMRからみた超イオン伝導体のイオン拡散挙動2004

    • Author(s)
      中村浩一他
    • Journal Title

      日本結晶学会誌 46

      Pages: 399-406

    • Related Report
      2004 Annual Research Report

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Published: 2003-04-01   Modified: 2020-05-15  

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