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EXPERIMENTAL STUDY ON NUMBER DENSITY AND MOBILITY OF ELECTRIC CARRIER IN A CERAMIC INSULATOR,ALUMINA

Research Project

Project/Area Number 06650737
Research Category

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

Allocation TypeSingle-year Grants
Research Field Inorganic materials/Physical properties
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

SHIKAMA Tatsuo  INSTITUTE FOR MATERIALS RESEARCH,TOHOKU UNIVERSITY,ASSOCIATE PROFESSOR, 金属材料研究所, 助教授 (30196365)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsCERAMICS / INSULATOR / ELECTRICAL CONDUCTIVITY / ELECTRIC CARRIER / MOBILITY / NUMBER DENSITY / アルミナ / 照射誘起伝導
Research Abstract

It has been attempted to measure a number density and a mobility of an electric carrier in a ceramic insulator, alumina. The specimens used are highly pure alumina polycrystals and a highly pure single crystal sapphire. Electrons are thought to be responsible for the electric conductivity in alumina and sapphire. However, the electrical conductivity in these materials are very low, namely in the order of 10^<-13>Sm^<-1>, at moderate temperatures. Thus, the measurements of the electrical conductivity as well as the number density and the mobility of the electric carrier is very difficult in general. In this experiment, we tried to use the phenomenon so-called radiation induced condutivity (RIC) to increase the electrical conductivity, thus, increasing the number density of the carrier. The RIC is the phenomenon similar to the phtoconductivity in semiconductors. It is in general very difficult to measure the electrical conductivity in radiation environments, but by refining a techniques it became possible to measure the electrical conductivity reliable in the radiation environments in this experimental study. The developed technique made it possible to measure the electrical conductivity in the range of to 10^<-11>-10^<-4>S.Using this technique, we obtained the data concerning dependence of the electrical conductivity on the crystal orientation, microstructures of the crystals, and so on. Also, we observed some non-ohmic behavior in insulators under irradiation. This non-ohmic behavior may be caused by the charge-ups of electric carriers near the boundaries between the electrodes and the insulators or at grain boundaries. Also, some charge trap effects at some point electrical impurities may be responsible. The obtained data will give us the quantitative information concerning the number density and the mobility of the electrical carrier in alumina and sapphire.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] T. Shikama & G. P. Pells: "A comparison of effects of neutron and other ivradiation sources on the dynamic property changes of ceramic insulators" Journal of Nuclear Materials. 212-215. 80-89 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Shikama et al.: "Study of radiation induced electrial degradation of Alumina in a dynamic pumping condition in a fission reactor" Journal of Nuclear Materials. 212-215. 1133-1137 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Shikama & G. P. Pells: "Radiation effects in Ceramics" Science Ripovt RITU. A40. 131-136 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 四竈 樹男: "原子炉照射技術とセラミックスの動的照射効果" 日本金属学会報,まてりあ. 33. 1363-1368 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tatsuo Shikama: "Electrical degradation of ceramic insulators due to dynamic irradiation effects" Materials Transactions, JIM. 36. 997-1003 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E. H. Farnum, T. Shikama et al.: "Radiation induced electrical degradation experiments in the Japan Materials Testing Reactor" Journal of Nuclear Materials. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tatsuo Shikama and G.Philip Pells: "Radiation effects in ceramics, I.Study of Dynamic Irradiation Effects on Electrical Conductivity in JMTR.-in comparison with results obtained with other irradiation sources-" Science Report RITU (Research Institute of Tohoku University). A40. 131-136 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.Philip Pells and T.Shikama: "Radiation effects in ceramics, II A Comparison of the Effects of Neutron and other Radiation Sources on the Properties of Ceramic Insulators" Science Report RITU (Research Institute of Tohoku University). A40. 137-146 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Shikama et al.: "Study of Radiation Induced Electrical Degradation of Alumina in a Dynamic Pumping Condition in a Fission Reactor" Science Report RITU (Research Institute of Tohoku University). A40. 159-166 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tatsuo Shikama and G.Philip Pells: "A comparison of the effects of neutron and other irradiation sources on the dynamic property changes of ceramic insulators" Journal of Nuclear Materials. 212-215. 80-89 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.H.Farnum, F.W.Clinard, Jr., W.F.Sommer, J.C.Kennedy III,T.Shikama: "Search for readiation-induced electrical degradation in alumina during spallation-neutron irradiation" Journal of Nuclear Materials. 212-215. 1128-1132 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Shikama, et al.: "Study of radiation induced electrical degradation of alumina in a dynamic pumping condition in a fission reactor" Journal of Nuclear Materials. 212-215. 1133-1137 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Narui, T.Sagawa, Y.Endo, T.Uramoto, T.Shikama, H.Kayano, M.Kiritani: "Development of experimental rigs for temperature-controlled reactor iradiations for fundamental study of radiation effects on fusion materials" Journal of Nuclear Materials. 212-215. 1645-1648 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Tatsuo Shikama: "Electrical Degradation of Ceramic Insulators due to Dynamic Irradiation Effects" Materials Transactions, JIM. 36. 997-1003 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.Farnum, T.Shikama, M.Narui, T.Sagawa, and K.Scaarborough: "Radiation-induced electrical degradation in the JMTR I" Internal Report of Loa Alamos National Laboratory, LA-UR-3988,1994 Partly published as United States Department of Energy Fusion Reactor Development Annual Progress Report. DOE/ER-0313/19. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.H.Farnum, T.Shikama, et al.: "Radiation induced electrical degradation experiments in the Japan Materials Testing Reactor" Journal of Nuclear Materials. 228. 117-128 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Shikama & G. P. Pells: "A Comparison of effects of neutron and other irradiation sources on the dynamic property changes of ceramic insulators" Journal of Nuclear Materials. 212-215. 80-89 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Shikama et al.: "Study of radiation induced electrical degradation of alumina in a dynamic pumping condition in a fission reactor" Journal of Nuclear Materials. 212-215. 1133-1137 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Shikama & G. P. Pells: "Radiation Effects in Ceramics I" Science Report RITU. A40. 131-136 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] G. P. Pells & T. Shikama: "Radiation Effects in Ceramics II" Science Report RITU. A40. 137-146 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 四竃樹男: "原子炉照射技術とセラミックスの動的照射効果" 日本金属学会報,まてりあ. 33. 1363-1368 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] Tatsuo Shikama: "Electrical Degradation of Ceramic Insulators du to Dynamic Irradiation Effects" Materials Transactions, JIM. 36. 997-1003 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 四竃 樹男: "原子炉内照射技術とセラミックスの動的照射効果" 日本金属学会会報,まてりあ. 33. 1363-1368 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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