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1999 Fiscal Year Final Research Report Summary

Development of a newly designed ultraviolet Raman scattering system for in-site observation of structure at very high temperature

Research Project

Project/Area Number 10555215
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Inorganic materials/Physical properties
Research InstitutionTokyo Institute of Technology

Principal Investigator

KAKIHANA Masato  Tokyo Institute of Technology, Materials and Structure Laboratory, Associate Professor, 応用セラミックス研究所, 助教授 (50233664)

Co-Investigator(Kenkyū-buntansha) SIMIDZU Ryosuke  Photon Design, Director, 代表
SAKAKI Satoshi  Tokyo Institute of Technology, Materials and Structure Laboratory, Associate Professor, 応用セラミックス研究所, 助教授 (10162364)
YOSHIMURA Masahiro  Tokyo Institute of Technology, Materials and Structure Laboratory, Professor, 応用セラミックス研究所, 教授 (10016826)
Project Period (FY) 1998 – 1999
KeywordsRaman scattering / ultra-violet light / thermal emission / in-site observation at high temperature / zirconia / hafnia / perovskite
Research Abstract

It is of prime importance to observe change in structure of ceramics in-situ at high temperature for controlling materials properties and compositions. In the field of ceramics, since the X-ray diffraction method is most frequently used for phase identification, the technique has been extended to in-situ observation of ceramic structure at high temperature. However, X-ray diffraction techniques are not always suitable for systems like ceramics, where positions of oxygen atoms play a crucial role in determining properties and phase transformations, or for samples comprised of ultra fine powders. For this reason, it is required to develop an alternative to the X-ray diffraction technique, which enables us to carry out studies at high temperatures. To achieve this requirement, we have developed a newly designed Raman scattering system combined with an ultra-violet excitation light source. In ordinary Raman scattering experiments, conventional visible light Ar lasers have been used as excitation sources for Raman spectra. Wavelengths most frequently used for Raman scattering include the blue line at 488 nm and the green line at 515 nm. However, in case where these visible lights are used for Raman scattering experiments at high temperature, a very strong background coming from thermal emissions interfere quite severely with the observation of relatively weak Raman scattering. To overcome this serious problem, we have designed a new Raman scattering system combined with an excitation source having a wave length 363 nm, which made possible to measure Raman spectra at temperatures even higher than 1500℃. We have successfully measured Raman spectra of various high temperature materials (hafnia, zirconia, and perovskite) and clearly observed their phase transformations in situ at high temperatures. For instance, the monoclinic-to-tetragonal transformation of hafnia finished around 2080 K on heating, while the monoclinic phase appeared at 2018 K on cooling.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] O. Yokota, M. Kakihana: "Synthesis of metastable tetragonal (t')ZrO_2-12mol%YO_<1.5> by the organic polymerized complex method"Journal of American Ceramic Society. 82・5. 1333-1335 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Fujimori, M. Kakihana: "Phase transition and soft phonon modes in SrZrO_3 around 1200°C by ultraviolet laser Raman spectoscopy"Physical Review B. 61・ 3. 895-901 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W S. Cho, M. Kakihana: "Chracterization of si_3N_4/SiC nanocomposite by Raman scattering and XPS"Journal of Alloys and Compounds. 285. 255-259 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Fujimori, M. Kakihana: "In situ ultraviolet Ramon study of the phase transition of hafnia up to 2085K"Journal of American Ceramic Society. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O. Yokkota, M. Kakihana: "Synthesis of metastable tetragonal (t'9ZrOィイD22ィエD2-12mol%YOィイD21.5ィエD2 by the organic polymerized complex method"Journal of American Ceramic Society. 82-5. 1333-1335 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fujimori, M. Kakihana: "Phase transition and soft phonon modes in SrZrOィイD23ィエD2 around 1200℃ by ultraviolet laser Raman spectroscopy"Physical Review B. 61-3. 895-901 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W. S. Cho, M. Kakihana: "Characterization of SiィイD23ィエD2NィイD24ィエD2/SiC nanocomposite by Raman scattering and XPS"Journal of Alloys and Compounds. 285. 255-259 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fujimor, M. Kakihana: "In site ultraviolet Raman study of the phase transition of hafnia up to 2085K"Journal of American Ceramic Society. (in press).

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

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Published: 2001-10-23  

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