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SINGLE CRYSTAL GROWTH OF ANATASE TiO2 AND DEPENDENCE OF ITS ELECTRIC AND OPTICAL PROPERTIES ON THE MOLPHOLOGY AND OXYGEN DEFECTS.

Research Project

Project/Area Number 08454080
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionYOKOHAMA NATIONAL UNIVERSITY

Principal Investigator

KURITA Susumu  YOKOHAMA NATIONAL UNIVERSITY FACULTY OF ENGINEERING PROFESSOR, 工学部, 教授 (30089833)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥6,200,000 (Direct Cost: ¥6,200,000)
KeywordsTITANIUM DIOXIDE / ANATASE / SINGLE CRYSTAL GROWTH / OPTICAL PROPERTY / OXYGEN DEFECT / EXCITON / 電気伝導 / 励起子
Research Abstract

THE METHOD OF SINGLE CRYSTAL GROWTH OF ANATASE TiO2 HAS BEEN INVESTIGATED ON THE BASE OF THE CHMICAL VAPOR TRANSPORT REACTION.THE MOST SUCCESSFUL CONDITON OF CRYSTAL GROWTH IS THAT TRANSPORT AGENT OF NH_4Cl, TEMPERATURE OF TEH SOURCE OF SEALED AMPOULE AND TEH GROWING PART WERE 750-800゚C AND 650-700゚C,RESPECTIVELY.CRYSTALS OF ABOUT 2x2x3mm^3 IN SIZE THAT WERE OCTAHEDRON SHAPED IN COLOR OF TRANSPARENT PALE BLUE WERE GROWN.(1) POLARIZED REFLECION SPECTRA OF THREE CRYSTALLINE MODEFICATIONS OF RUTILE,ANATASE AND BROOKITE,WERE MEASURED FOR THE PHOTON ENERGY RANGE OF 2-25eV USING SYNCHROTRON ORBITAL RADIATION.THE DIFFERENCE IN THE SPECTRAL FEATURE IS DISCUSSED ON THE BASIS OF THE CRYSTAL SRUCTURE OF THE MODIFICATIONS.(2) THE ANATASE HAS THE DIRECT ALLOWED TRANSITION GAP AND THE ABSORPTION TAIL SHOWS URBACH RULE.THE STEEPNESS INDEX OBTAINED INDICATES THAT AN EXCITON IS SELF-TRAPPED AFTER THE RELAXATION.(3) IN THE ANATASE PHASE WITH OXYGEN VACANCY,AN ABSORPTION BNAD POLARIZED MAINLY E//a APPEARS AT THE PEAK OF 3.0eV.THE VACANCY DISAPPEARS AFTER HEAT-TREATMENT OF 48HRS AT 800゚C ON THE OXYGEN PRESSURE OF 1MPa. (4) BROAD LUMINESCENCE WAS OBSERVED WITH PEAKS AT AROUND 2.1 AND 2.3eV WHICH ARE FROM THE SELF-TRAPPED EXCITONS.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] N.Hosaka et al.: "UV reflection spectra of anatase TiO_2." J.Elect.Spectrosc.Relat.Phenom.78. 75-78 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Hosaka et al.: "Optical properties of single crystal anatase TiO_2." J.Phys.Soc.Jpn.66. 877-880 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Hosaka et al.: "Excitonic state in anatase TiO_2 single ctystal." J.Lumin.72-74. 874-875 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Sekiya et al.: "Structure dependence of reflection spectra of TiO_2 single crystals." J.Elect.Spectrosc.Relat.Phenom.(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Hosaka, T.Sekiya, M.Fujisawa, C.Satoko and S.Kurita: "UV reflection spectra of anatase TO_2." J.Electron Spectrose. Relat, Phenom. Vol.78. 75-78 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Hosaka, T.Sekiya and S.Kurita: "Excitonic state in anatase TiO_2 single crystal." J.Lumin. Vol.72-74. 874-875 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Hosaka, T.Sekiya, C.Satoko and S.Kurita: "Optical properties of anatase TiO_2 single crystal" J.Phys.Soc.Jpn. Vol.66. 877-880 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Sekiya, M.Igarashi, S.Kurita, S.Takekawa and M.Fujisawa: "Structure dependence of reflection spectra of TiO_2 sngle crystals" J.Electron Spectrose.Relat.Phenom. (In press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Hosaka et al.: "UV reflection spectra of anatase TiO_2." J.Elect.Spectrosc.Relat.Phenom.78. 75-78 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Hosaka et al.: "Optical properties of single crystal anatase TiO_2." J.Phys.Soc.Jpn.66. 877-880 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Hosaka et al.: "Excitonic state in anatase TiO_2 single ctystal." J.Lumin.72-74. 874-875 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Sekiya et al.: "Structure dependence of reflection spectra of TiO_2 single crystals." J.Elect.Spectrosc.Relat.Phenom.(印刷中).

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Hosaka et al.: "UV reflection spectra of Anatase TiO_2." J.Elect.Spectrosc.Relat.Phenom.78. 75-78 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Hosaka et al.: "Optical properties of single crystal anatase TiO_2." J.Phys.Soc.Jpn.66(印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Hosaka et al.: "Excitonic state in anatase TiO_2 single crystal." J.Lumin.(印刷中).

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2020-05-15  

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