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1987 Fiscal Year Final Research Report Summary

Thin film formation of Na_2O-Al_2O_3 hybrid solid electrolytes by Rf-sputtering and characterization of their films.

Research Project

Project/Area Number 61550577
Research Category

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

Allocation TypeSingle-year Grants
Research Field 無機工業化学
Research InstitutionOsaka University

Principal Investigator

NOBUGAI Kohji  The institute of scientific and industrial research (ISIR), Osaka University, 産業科学研究所, 助手 (70156222)

Co-Investigator(Kenkyū-buntansha) KOTO Kichiro  The institute of scientific and industrial research (ISIR), Osaka University, 産業科学研究所, 助教授 (40029872)
KANAMARU Fumikazu  The institute of scientific and industrial research (ISIR), Osaka University, 産業科学研究所, 教授 (40029848)
Project Period (FY) 1986 – 1987
KeywordsSoild electrolyte thin film / Beta-alumina / Thin film superionic conductor / Rf-suputtering / Ultrasonic attenuation / Surface acoustic wave / SAW
Research Abstract

The in films of Na beta-alumina were prepared by rfsputtering, and ion transport mechanism of the films was investigated by the new method using surface acoustic wave(SAW). The coupling mechanims between SAW and mobile ions were also investigated.
The sputtered amorphous films of composition Na_2O.xAl_<>(5<x<10) were converted to Na beta-alumina by heat treatment at 1300 C. Measurements of the SAW attenuation were made on the films by using SAW-induced piezoelectric field and SWA-induced elastic strain. The results obtained by these experiments are as follows;
1. Thin films of Na beta-alumina exhibiting high ionic conductivity, close to that of a single crystal, were obtained by rf-sputtering and subsequent heating, and the high conductivity is due to both the dense microtexture formed by crystallization of the poreless amophous films and the preferred orientation of crystallites with the counduction plane (0001) parallel to the film surface.
2. New methods for microdynamic anlysis of mobile ions were developed by using SAW, and the mechanisms of SAW-mobile ion coupling were discussed.
3. Na ions in the beta-alumina couple strongle to the SAW-induced piezoelectric field, and also couple to the SAW-induced acoustic strain, indicating that the piezoelectric coupling and the local strain coupling exist in the ion-lattice system as well as in the electron-lattice system.
4. The diffusive motion of Na ions in the beta-alumina is caused by the co-operative hopping of paired interstitial Na ions.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Kohji Nobugai: Phonon Scattering in Condensed Matter V,ed.byA.C Anderson,Illinois. 190-193 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 延谷宏治: 日本化学会誌. 2242-2247 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Suguru Inamura: J.Solid State Chem.68. 124-127 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Fumikazu Kanamaru: Mem.Inst.Sci.Ind.Res.,Osaka Univ.45. 77-88 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kohji Nobugai: "Measurements of relaxation time of sodium ions in sputtered thin film beta-alumina" Phonon Scattering in Condensed MatterV, ed. by A.C Anderson,Illinois. 190-193 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kohji Nobugai: "Preparation of Na <beta>-alumina thin films by rf-sputtering and their ionic conduction" Nihon Kagakukai-shi. 2242-2247 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suguru Inamura: "The preparation of NaCl-type Ti_1-xAl_xN solid solution" J. Solid State Chem.68. 124-127 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fumikazu Kanamaru: "Magnetic recording materials" Mem.Inst.Sci.Ind.Res.,Osaka Univ.45. 77-88 (1988)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1989-03-30  

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