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Structural Changes in Molten Vb and VIb Metals and Ultra-Sound Propagation.

Research Project

Project/Area Number 10650648
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionNIIGATA UNIVERSITY

Principal Investigator

TSUCHIYA Yoshimi  NIIGATA UNIVERSITY, FACULTY OF SCIENCE, PROFESSOR, 理学部, 教授 (60089836)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsSOUND VELOCITY / LIQUID As / STRUCTURAL CHANGE / TERMODYNAMICS / TWO-LIQUID PHASE / STABILITY / PEIERLS DISTORTION / struetural change / thermodynamics / molton metal / As-Te
Research Abstract

We have renewed a gated RF amplifier with the grant and set up a stable ultra-sonic measurement gear, with which we have measured systematically the velocity of sound in various molten alloys at high temperatures. To compliment the ultra-sound measurements, we have measured the density with the gamma-ray attenuation method. Further we have derived the new thermodynamic relations which enable to elucidate the concentration fluctuations induced by local structural changes. During the period of the grand, we have published ten papers in well-established international journals. To proceed the research project, I was reviewed by Dr. C. Bergman at CNRS, Marseille and Dr. F. Sommer at MPI, Stuttgart in 1998.
Main results are
1. Structural changes in the As-Te system : the phase diagram has been investigated by detecting a minimum in the sound velocity and/or the thermal expansion coefficient as a function of temperature. The minimum has been confirmed up to 60 at.% of As. The transition point i … More n the structural change in the super-cooled molten As has been determined to be 734 ± 6℃ by an extrapolation.
2. Structural changes in the molten II b-VI b system : by measuring the sound velocity, it has been shown that the molten CdTe has very stable structure whereas the molten HgTe undergoes continuous structural changes around the melting point. The transition point in the molten HgTe has been determined.
3. The thermodynamic relations connecting structural changes and concentration fluctuations in a binary mixture : the new thermodynamic relations which enable to elucidate the concentration fluctuations induced by local structural changes have been derived. Application has been made to show the origin of the looped two-melt phase in the molted S-Te system.
The concentration fluctuations induced by structural changes are one of the key points to be clarified to grow high quality crystals of the compound semiconductors. We are planning to investigate systematically the phenomenon by measuring the specific heat as well as the sound velocity and density of molten compound semiconductors at high temperatures. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] Y. Tsuchiya: "Molar volume of VIb-chalcogenide alloys : Compound forming effects and structural changes with volume contraction"Thermochimica Acta. 314. 275-280 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Sound velocity in the molten As-Te system"Ber. Bunsenges. Phys. Chem.. 102. 1123-1127 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Elucidation of structural changes and concentration fluctuations in binary mixtures using new thermodynamic relations"J. Phys. : Condens. Matter. 11. 593-602 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. J. Singh and Y. Tsuchiya: "Ultrasonic velocity measurements in liquid Cd_x-Te_<1-x>alloys"J. Non Cryst. Solids. 244. 137-142 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. J. Singh and Y. Tsuchiya: "The velocity of sound and compressibility in the melts of Hg-Te"Eur. Phys. J. B.. 12. 235-240 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] F. Kakinuma, Y. Tsuchiya and K. Suzuki: "Critical sound wave propagation in liquid Ag-Ag_2Te system"J. Non Cryst. Solids. 250-252. 373-376 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya, R. Satoh and F. Kakinuma: "The velocity of sound in the liquid S-Se alloy"J. Non Cryst. Solids. 250-252. 468-472 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "The molar volume of molten As-Bi and As-Te systems"J. Non Cryst. Solids. 250-252. 473-477

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya, F. Kakinuma, M. -V. Coulet, C bichara and C. Bergman: "Origin of the looped two-melts phae in the liquid S-Te system"J. Phys. : Condens. Matter. 11. 8759-8772 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Concentration fluctuations induced by structural changes in the liquid Se-Te alloy"J. Phys. Soc. Jpn. 69. 473-478 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Molar volume of VI b-chalcogenide alloys : Compound forming effects and structural changes with volume contraction."Thermochimica Acta. 314. 275-280 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Sound velocity in the molten As-Te system."Ber. Bunsenges. Phys. Chem.. 102. 1123-1127 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Elucidation of structural changes and concentration fluctuations in binary mixtures using new thermodynamic relations."J. Phys. : Condens. Matter. 11. 593-602 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. J. Singh and Y. Tsuchiya: "Ultrasonic velocity measurements in liquid CdィイD2xィエD2-TeィイD21-xィエD2 alloys."J. Non Cryst. Solids. 244. 137-142 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. J. Singh and Y. Tsuchiya: "The velocity of sound and compressibility in the melts of Hg-Te system."Eur. Phys. J. B. 12. 235-240 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] F. Kakinuma, Y. Tsuchiya and K. Suzuki: "Critical sound wave propagation in liquid Ag-AgィイD22ィエD2Te system."J. Non Cryst. Solids. 250-252. 373-376 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya, R. Satoh and F. Kakinuma: "The velocity of sound in the liquid S-Se alloy."J. Non Cryst. Solids. 250-252. 468-472 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "The molar volume of molten As-Sb, As-Bi and As-Te systems."J. Non Cryst. Solids. 250-252. 473-477 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya, F. Kakinuma, M. -V. Coulet, C Bichara and C. Bergman: "Origin of the looped two-melts phase in the liquid S-Te system."J. Phys. : Condens. Matter. 11. 8759-8782 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Concentration fluctuations induced by structural changes in the liquid Se-Te alloy."J. Phys. Soc. Jpn.. 69. 473-478 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. J. Singh and Y. Tsuchiya: "Ultrasonic velocity measurements in liquid Cd_x-Te_<1-x> alloys."J. Non Cryst. Solids. vol. 244. 137-142. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K. J. Singh and Y. Tsuchiya: "The velocity of sound and compressibility in the melts of Hg-Te system."Eur. Phys. J. B. vol. 12. 235-240. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Tsuchiya, R. Satoh and F. Kakinuma: "The velocity of sound in the liquid S-Se alloy."J. Non Cryst. Solids. vol. 250-252. 468-472. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Tsuchiya: "The molar volume of molten As-Sb, As-Bi and As-Te systems."J. Non Cryst. Solids. vol. 250-252. 473-477. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Tsuchiya, F. Kakinuma, M. -V. Coulet, C Bichara and C. Bergman: "Origin of the looped two-melts phase in the liquid S-Te system."J. Phys. : Condens. Matter. vol. 11. 8759-8772. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Tsuchiya: "Concentration fluctuations induced by structural changes in the liquid Se-Te alloy."J. Phys. Soc. Jpn.. vol. 69. 473-478. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yoshimi Tsuchiya: "Molarvolume of IVb-chal cogenidealloys: Compound forming effects and structural changes with volume contraction" Thermochimica Acta. 314. 275-280 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Tsuchiya: "Sound velocity in the molten As-Te system" Ber.Bunsenges.phys.Chem.102. 1123-1127 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Tsuchiya: "Elucidation of structural changes and concentration fluctuations in binary mixtures using new thermodynamic relations" J.Phys.:Condens.Matter. 11. 593-602 (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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