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Application of specific heat measurements to the study of structural changes and concentration fluctuations in the molten semiconductors

Research Project

Project/Area Number 13650715
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) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
Keywordsliquid semiconductor / specific heat / liquid Ge-Te alloy / thermodynamics / structural change / neutron diffraction / Ge-Te / 濃度揺らぎ
Research Abstract

Using the grant, we have renewed some of the electronic modules of the scanning adiabatic calorimeter installed in the laboratory about two decades ago. We use this calorimeter to measure the specific heat of massive specimen (~ 0.1 mole) above the liquidus temperature. To complement the above measurements, the specific heat in the super-cooled region below the melting temperature is measured with the modulation method using a small specimen (~ 0.005 mole) sealed in capillary molten quartz cell. By combining both data, we can obtain the specific heat of molten metals and alloys in the wide range of temperature up to 800℃.
We measured the specific heat of Ge-Te alloys around the Te rich eutectic composition (15 at.% Te) that shows the most sharp transition among molten alloys undergoing continues structural change. In the meantime, we obtained the density by the high energy γ-ray attenuation method and measured the sound velocity. We could determine all the thermodynamic response functio … More ns characterizing the structural changes in the Ge-Te system, therefore. Main results are:
1. the crossover temperature T* indicated by a peak in the specific heat as a function of temperature reached a maximum at the eutectic composition, Ge_<15>Te_<85>.
2. the width of the specific heat becomes narrowest at the same composition.
From these results we showed that the structural change in the eutectic Ge-Te alloy does not induce the concentration fluctuations and therefore it is a kind of isomorphic type. Further we proposed a new idea that the width of the specific heat can be interpreted as fluctuations in the crossover temperature T*. (J. Non-Cryst. Solids 312-314 (2002) 212)
To investigate the structural evolution in the atomic scale, I analyzed the neutron diffraction data together with the above-mentioned thermodynamic data in collaboration with Drs. C. Bergman (L2MP CNRS, Marseille) and C. Bichara (CRM2C CNRS, Marseille). It is shown that the structural change undergone by the liquid mainly consists in a modification of the first-neighbor shell of the Ge atoms and the Peierls distortion mechanism plays an important role in the structural change. (Phys. Rev. B. 67 (2003) 104202-104202-5)) Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Y.Tsuchiya: "Concentration fluctuations induced by thermally-driven local order change in the molten binary alloy"Scandinavian J. Metallugy. 30. 345-351 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] P.Terzieff, Y.Tsuchiya: "Magnettic susceptibility of liquid Ag-Ge, Ag-Sn and Ag-Pb"J. Phys. : Condens. Matter. 13. 3572-3582 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] F.Kakinuma, Y.Tsuchiya: "Molar volume and adiabatic compressibility in the molten Ag-Te sytem"J. Phys. Soc. Jpn. 70. 2948-2952 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.J.Singh, Y.Tsuchiya: "Investigation of the structural changes in the molten Ga-Te sytem using sound velocity and density measurements"J. Phys. Soc. Jpn. 70. 3306-3311 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Tsuchiya: "Thermodynamics of the structural changes in the liquid Ge-Te system around the Te-rich eutectic composition"J. Non-Cryst. Solids. 312-314. 212-216 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] F.Kakinuma, M.Sakurai, Y.Thuchiya, T.Fukunaga, K.Suzuki: "Thermodynamic and structural studies of liquid and amorphous Ge_<15>Te_<85-x>M_x (M=ag, Cu, In, and x=0 to 10)"J. Phys. Soc. Jpn. 72. 101-106 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] C.Bergman, C.Bichara, J.P.Gaspard, Y.Tsuchiya: "Experimental investigation of the water-like density anomaly in liquid Ge_<15>Te_<85> eutectic alloy"Phys. Rev. B.. 67. 104202-1-104202-5 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Concentration fluctuations induced by thermally-driven local order change in the molten binary alloy"Scandinavian Journal of Metallurgy. 30. 345-351 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] P. Terzieff, Y. Tsuchiya: "Magnetic susceptibility of liquid Ag-Ge, Ag-Sn and Ag-Pb"J. Phys.: Condens. Matter. 13. 3572-3582 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] F. Kakinuma, Y. Tsuchiya: "Molar volume and adiabatic compressibility in the molten Ag-Te system"J. Phys. Soc. Jpn.. 70. 2948-2952 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K. J. Singh, Y. Tsuchiya: "Investigation of the structural changes in the molten Ga-Te system using sound velocity and density measurements"J. Phys. Soc. Jpn.. 70. 3306-3311 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Tsuchiya: "Thermodynamics of the structural changes in the liquid Ge-Te system around the Te-rich eutectic composition"J. Non-Cryst. Solids.. 312-314. 212-216 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] F. Kakinuma, M. Sakurai, Y. Tsuchiya, T. Fukunaga, K. Suzuki: "Thermodynamic and structural studies of liquid and amorphous Ge_<15>Te_<85-x>M_x (M=ag, Cu, In, and x=0 to 10)"J. Phys. Soc. Jpn.. 72. 101-106 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] C. Bergman, C. Bichara, J. P. Gaspard, Y. Tsuchiya: "Experimental investigation of the water-like density anomaly in liquid Ge_<15>Te_<85> eutectic alloy"Phys. Rev. B.. 67. 104202-104202-5 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Tsuchiya: "Thermodynamics of the stuctural changes in the liquid Ge-Te system around the Tc-rich eutectic composition"J. Non-Cryst. Solids. 312-314. 212-216 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] F.Kakinuma, M.Sakurai, Y.Tsuchiya, T.Fukunaga, K.Suzuki: "Thermodynamic and structural studies of liquid and amorphous Ge_<15>Te_<85-x>M_x(M=ag, Cu, In, and X=0 to 10)"J. Phys. Soc. Jpn. 72. 101-106 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] C.Bergman C.Bichara, J.P.Gaspard, Y.Tsuchiya: "Experimental investigation of the water-like density anomaly in liquid Ge_<15>Te_<85> eutecticalloy"Phys. Rev. B.. 67. 104202-1-104202-5 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] P.Terzieff, Y.Tsuchiya: "Magnetic susceptibility of liquid Ag-Ge, Ag-Sn and Ag-Pb"J.Phys.: Condens. Matter. 13. 3573-3582 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Matsuda, Y.Seto, X.Wang, Y.Tsuchiya: "A thermal and structural study on lanthanum hexacyanocobaltate(III) pentabydrate Part II"J. Thermal Analysis and Calorimetry. 64. 1045-1051 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] F.Kakinuma, Y.Tsuchiya: "Molar volume and adiabatic compressibility in the molten Ag-Te system"J. Phys. Soc. Jpn. 70. 2948-2952 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.J.Singh, Y.Tsuchiya: "Investigation of the structural changes in the molten Ga-Te system using sound velocity and density measurements"J. Phys. Soc. Jpn. 70. 3306-3311 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Tsuchiya: "Concentration fluctuations induced by thermally-driven local order changes in the molten binary alloy"Scandinavian J. Metallurgy. 30. 345-351 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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