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2003 Fiscal Year Final Research Report Summary

A new method on the study of phase transition "Phase Transition seeing by Milli-Kelvin Stabilized cell" Development and Application

Research Project

Project/Area Number 14550016
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionRitsumeikan University

Principal Investigator

YOSHIMURA Yukio  Ritsumeikan Univ., Fac Science and Engineering, Professor, 理工学部, 教授 (10066699)

Co-Investigator(Kenkyū-buntansha) TOZAKI Kenichi  Chiba University, Department of Physics, Faculty of Education, 教育学部, 教授 (30102031)
KOJIMA Akira  The Uniyersity of Shiga Prefecture, Department of Material Science, 工学部, 助教授 (00205379)
IWASAKI Hiroshi  Ritsumeikan Univ., Fac Science and Engineering, Professor, 理工学部, 教授 (50005857)
Project Period (FY) 2002 – 2003
KeywordsmK-Stabilized Cell / Simultaneous measurements of heat flux and dielectrics / X-ray diffraction / Measurements of displacement / BaTiO_3 single crystal / BaTiO_3単結晶 / CsPbCl_3単結晶 / SrTiO_3単結晶
Research Abstract

The good fruit of this year was obtained from the results for both researches of the physical properties and structural studies on three phase transitions of BaTiO3 (high temp. phase-Room temp. phase-Low temp. phase-Most low temp. phase). They made clear the nature of the phase transition mechanism of each phase transition. Single crystals used in this study were grown by top-seeded solution growth method and the crystals were not accomplished poling. It was cleared that each phase transition has different transition mechanism by the measurements of dielectric constant, displacement current, dilatometric measurements, and resonant ultrasonic spectroscopy simultaneous with endothermic or exothermic heat measurements. The result of the resonant ultrasonic spectroscopy, especially, showed that resonant spectra for both the room temperature and the low temperature phases are rather complex compare with the both the high temperature and the most low temperature phases. This result suggested that the crystal structures of the both the room temperature and the low temperature phases are complex compare with those of the high temperature and the most low temperature phases. On the other hand, the organization of this research studies on the physical property of the crystal and on the structural study by X-ray diffraction, independently. The results on the structural study showed that the crystal structure changes by the phase transitions as follow; cubic system-hybrid structure of tetragonal and monoclinic 1 systems-hybrid structure of orthorhombic 1 and monocliic 2 systems-orthorhombic 2. The result is important to explain the obtained physical properties and well agrees with the results expected from the resonant ultrasonic spectroscopy study.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] A.Kojima, Y.Kawakatsu, H.Sasou, Y.Yoshimura H Iwasaki, K.Tozaki: "Novel Feature of the Phase Transitions in BaTiO_3 Revealed by "mK-Stabilized Cell""Ferroelectrics. Vol.284. 93-106 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kojima, Y.Nishibori, Y.Maeda, N.Inoue, Y.Yoshimura, N.Tokunaga, H.Iwasaki, K.Tozaki: "Heat Flow and X-ray Diffraction Study on the Phase Transitions in CsPbcl_3"Ferroelectrics. Vol.284. 113-120 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kojima, Y.Yoshimura, H.Sasou, N.Tokunaga, H.Iwasaki, K.Tozaki: "New Finding of Phase Transition Feature in BaTiO_3"proceedings of The 10^<th> Eufopean Meeting on Ferroelectricity, Aug. 3-8, 2003 Cambridge, UK. (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tozaki, R.Masida, S.Masuda, H.Hayashi, H.Inaba: "Simultaneous measurements of heat flux and thermal expansion on hyperfine multistage transitions of single crystal BaTiO_3"Physica B. B334. 382-386 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kojima, Y.Yoshimura, H.Iwasaki, K.Tozaki: ""temperature : Its Measurement and Control in Science and Industry"American Institute of Physics. (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kojima, Y.Kawakatsu, H.Sasou, Y.Yoshimura H.Iwasaki, K.Tozaki: "Novel Feature of the Phase Transitions in. BaTiO_3 Revealed by "inK-Stabilized Cell""Ferroelectrics. Vol.284. 93-106 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojima, Y.Nishibori, Y.Maeda, N.Inoue, Y.Yoshimura, N.Tokunaga, H.Iwasaki, K.Tozaki: "Heat Flow and X-ray Diffraction Study on the Phase Transitions in CsPbCl_3"Ferroelectrics. Vol.284. 113-120 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Kojima, Y.Yoshimura, H.Sasou, N.Tokunaga, H.Iwasaki, K.Tozaki: "New Finding of Phase Transition Feature in BaTiO_3"proceedings of The 10th European Meeting on Ferroelectricity, Cambridge, UK. Aug.. 3-8 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tozaki, R.Masida, S.Masuda, H.Hayashi, H.Inaba: "Simultaneous measurements of heat flux and thermal expansion on hyperfine multistage transitions of single crystal BaTiO_3"Physica B. 334. 382-389 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Kojima, H.Sasou, K.Tozaki, Y.Yoshimura, N.Tokunaga, H.Iwasaki: "Precise Simultaneous Measurements of Thermal, Electrical and Acoustic Properties-New Feature of the 403 K Phase Transition in BaTiO_3"proceedings of The 15th Symposium on Thermophysical Properties, Bonder, Co., USA. June. 22-27 (2003)

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

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Published: 2005-04-19  

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