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Correlation of Ionic Conductivity with Intersurface Phenomena in Superionic-Conductor-Superlattice

Research Project

Project/Area Number 01540267
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionNiigata University

Principal Investigator

KOBAYASHI Michisuke  Niigata Univ., Faculty of Science, Associate Professor, 理学部, 助教授 (20018881)

Co-Investigator(Kenkyū-buntansha) YONASHIRO Katsukuni  Ryukyu Univ., General Education, Professor, 教養部, 教授 (10045164)
TACHIBANA Fumio  Niigata Univ., Information Processing Center, Professor, 総合情報処理センター, 助教授 (60092706)
OKAZAKI Hideo  Niigata Univ., General Education, Professor, 教養部, 教授 (60018265)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1990: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsSuperionic Conductor / Superlattice / Ionic Conductivity / Simulation / Diffusion Coefficient / Inter-surface Wave / Collective Motion / Silver Iodide / 決化銀
Research Abstract

A computer simulation by a molecular dynamics method at constant volume has been performed to a model system which is composed of accumulating two different ionic conductors :・・・AgI-Ag_2S-AgI-Ag_2S・・・. Along the c-axis (z-axis), AgI-parts are compressed and Ag_2S-parts are stretched. About 3% of Ag ions in Ag_2S-parts have been transfered to AgI-parts. The self-diffusion coefficient of Ag ions in AgI-parts decreases by 40-50 % compared with that in a single AgI-system, while the diffusion coefficient of Ag ions in Ag_2S-parts increases by 30 % compared with that in a single Ag_2S-system. The ionic conductivity of the superlattice-system is larger than that of either material of the AgI-system or Ag_2S-system. The calculation suggests the possibility of the existence of a new material which has a larger ionic conductivity.
In this calculation, the newtonian equations of motion of the particles in a fixed MD cell of volume V have been solved numerically. The total energy E has been conserved, and thus the ensemble generated by the simulation is the microcanonical or (E,V,N) ensemble. But these conditions of simulation are not the same as those normally encountered in experiments. The usual experiments are performed under conditions of constant temperature and constant pressure or (T,P,N) conditions. Then we are now performing the MD calculation at constant pressure to the superionic superlattice-system, with also considering the electronic polarizability of anions.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] T.Tomoyose,K.Yonashiro and M.Kobayashi: "“Dynamical Properties of Layered Superionic Conductors"" Phys.Rev.B41. 10012-10020 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Tomoyose,K.Yonashiro and M.Kobayashi: "“Dimensional Crossover of Collective Mode in Layered Superionic Conductors"" Solid State Ionics. 40/41. 213-215 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Aniya and M.Kobayashi: "“Collective Motion in Fast Ion Conductor Superlattices"" Solid State Ionics. 40/41. 216-219 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Kobayashi,H.Shimojo,F.Tachibana and H.Okazaki: "“Ionic Motion in Superionic Superlattice"" Solid State Ionics. 40/41. 303-307 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M.Kobayashi,F.Shimojo,F.Tachibana and H.Okazaki: "“Design of New Material with High Ionic Conductivity"" J.Phys.Soc.Jpn.60. 245-253 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Tomoyose, K. Yonashiro, and M. Kobayashi: "Dynamical Properties of Layered Superionic Conductors" Phys. Rev. B41. 10012-10020 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Tomoyose, K. Yonashiro, and M. Kobayashi: "Dimensional Crossover of Collective Mode in Layered Superionic Conductors" Proceedings of the 7th Int. Conf. on Solid State Ionics, Hakone, Japan, November 5-11, 1989 Solid State Ionics. 40/41. 213-215 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Aniya, and M. Kobayashi: "Collective Motion in Fast Ion Conductor Superlattices" Proceeding of the 7th Int. Conf. on Solid State Ionics, Hakone, Japan, November 5-11, 1989 Solid State Ionics. 40/41. 216-219 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Kobayashi, H. Shimojo, F. Tachibana, and H. Okazaki: "Ionic Motion in Superionic Superlattice" Proceedings of the 7th Int. Conf on Solid State Ionics, Hakone, Japan, November 5-11, 1989 Solid State Ionics. 40/41. 303-307 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Kobayashi, F. Shimojo, F. Tachibana, and H. Okazaki: "Design of New Material with High Ionic Conductivity" J. Phys. Soc. Jpn.60. 245-253 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Tomoyose,K.Yonashiro and M.Kobayashi: "“Dynamical Properties of Layered Superionic Conductors"" Phys.Rev.B41. 10012-10020 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Tomoyose,K.Yonashiro and M.Kobayashi: "“Dimensional Crossover of Collective Mode in Layered Superionic Conductors"" Solid State Ionics. 40/41. 213-215 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Aniya and M.Kobayashi: "“Collective Motion in Fast Ion Conductor Superlattices"" Solid State Ionics. 40/41. 216-219 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Kobayashi,H.Shimojo,F.Tachibana and H.Okazaki: "“Ionic Motion in Superionic Superlattice"" Solid State Ionics. 40/41. 303-307 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Kobayashi,F.Shimojo,F.Tachibana and H.Okazaki: "“Design of New Material with High Ionic Conductivity"" J.Phys.Soc.Jpn.60. 245-253 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] F.Tachibana: "Residence time and density distribution of silver ions in α-Ag_2Te by molecular-dynamics simulation" Phys.Rev.B. 40. 3360-3363 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Kobayashi: "Jump frequency of silver ions for diffusion in α-Ag_2Te" Phys.Rev.B. 40. 9552-9557 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] H.Shimojo: "Ultrasonic Attenuation in Silver Chalcogenides" Solid state Ionics. 37. 61-65 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Aniya: "Collective Excitations in Fast Ion Conductor Superlattice" Appl.Phys.A. 49. 641-646 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Tomoyose: "Dynamical properties of layered superionic conductors" Phys.Rev.B. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Kobayashi: "Ionic Motion in Superionic superlattice" Solid State Ionics. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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