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Nitride Metallurgy: Thermodynamics of Nitrides and Development of New Synthesis Methods

Research Project

Project/Area Number 12450302
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionTohoku University

Principal Investigator

WASEDA Yoshio  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (00006058)

Co-Investigator(Kenkyū-buntansha) SHIBATA Hiroyuki  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Research Associate, 多元物質科学研究所, 助手 (50250824)
YAMANE Hisanori  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (20191364)
SUIZUKI Shigeru  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (40143028)
H.OKABE Toru  University of Tokyo, Institute of Industrial Science Associate Professor, 生産技術研究所, 助教授 (00280884)
宇田 哲也  東北大学, 多元物質科学研究所, 助手 (80312651)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2000: ¥4,300,000 (Direct Cost: ¥4,300,000)
Keywordsnitride synthesis / phase diagram / Li-Mg-N / lithium magnesium complex nitride / thermodynamics / nitrogen chemical sensors / ガリウム / 窒素 / 起電力
Research Abstract

As part of a systematic study on the thermodynamic properties of complex nitrides, phase equilibria of the system Li-M-N (M=Mg, Al, Ga) at 900 K were investigated. An attempt to determine the thermodynamic properties of complex nitrides was made by using the galvanic cell method, which utilizes LiMgN as an electrolyte under nitrogen atmosphere. The electromotive force (Emf) of the cell at temperatures between 800 and 1100 K was measured. While the Emf of the cell at 900 K was measured to be 0.137 V, data discrepancies of ±0.03V were found. It was difficult to determine temperature dependence of the Emf. The Gibbs energy change for the reaction, 1/3 Li_3N(s)+1/3Mg_3N_2(s)=LiMgN (s), at 900 K was determined to be △G^o_r (LiMgN) = -13.2 (±2.9) kJ/mol. Using thermodynamic information on the binary nitride from literature, the standard Gibbs energy of LiMgN was derived to be ΔG^o_f (LiMgN) = -121 kJ at 900 K. The thermodynamic stability range of nitride was discussed by constructing isothermal chemical potential diagrams that provide a better understanding of the stability region of the LiMgN phase. The diagram was found to be in good agreement with the isothermal phase diagram determined by the alloy equilibration method. Although the obtained data includes large uncertainties, the results provide a better understanding of the thermodynamic stability of nitrides. The potential application of this complex nitride to nitrogen chemical sensors or a medium for controlling nitrogen potential is also shown.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] T.H.Okabe, A.Horiuchi, K.T.Jacob, Y.Waseda: "Physicochemical Studies of Lithium Nitride in Molten LiCl-KCl"Materials Trans., JIM. 41. 822-830 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.H.Okabe, A.Horiuchi, K.T.Jacob, Y.Waseda: "Electrochemical Properties of Li_3N Dissolved in Molten LiCl at 900K"J. Electrochem. Soc.. 148. E219-E226 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Yamane, T.H.Okabe, O.Ishiyama, Y.Waseda, M.Shimada: "Ternary Nitrides Prepared in the Li_3N-Mg_3N_2 System at 900-1000K"J. Alloys and Compounds. 319. 124-130 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.H.Okabe, O.Ishiyama, H.Yamane, K.T.Jacob, Y.Waseda: "Some Challenges on Nitride Metallurgy : Synthesis of Complex Nitrides, Phase Equilibria and Chemical Potential Measurements"Proceedings of Yazawa International Conference, TMS, March 1-6, San Diego, 2003. 563-577 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.H.Okabe, A.Horiuchi, K.T.Jacob and Y.Waseda: "Physicochemical Studies of Lithium Nitride in Molten LiCl-KCl"Materials Trans., JIM. 41,7. 822-830 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.H.Okabe, A.Horiuchi, K.T.Jacob and Y.Waseda: "Electrochemical Properties of Li_3N Dissolved in Molten LiCl at 900K"J.Electrochem.Soc.. 148,5. E219-E226 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Yamane, T.H.Okabe, O.Ishiyama, Y.Waseda, and M.Shimada: "Ternary Nitrides Prepared in the Li_3N-Mg_3N_2 System at 900-1000K"J.Alloys and Compounds. 319. 124-130 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.H.Okabe, O.Ishiyama, H.Yamane, K.T.Jacob, and Y.Waseda: "Some Challenges on Nitride Metallurgy: Synthesis of Complex Nitrides, Phase Equilibria and Chemical Potential Measurements"Proceedings of Yazawa International Conference, TMS,San Diego. March 1-6. 563-577 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Yamane, T.H.Okabe, O.Ishiyama, Y.Waseda, M.Shimada: "Ternary Nitrides Prepared in the N-Mg_3N_2 System at 900-100K"J. Alloys and Compounds. 320. 124-130 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.H.Okabe, A.Horiuchi, K.T.Jacob, Y.Waseda: "Physicochemical Studies of Lithium Nitride in Molten Li Cl-KCl"Materials Trans. JIM. 42. 822-830 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Yamane, T.H.Okabe, O.Ishiyama, Y.Waseda, M.Shimada: "Ternary Nitrides Prepared in the Li_3N-Mg_3N_2 System at 900-1000K"J. Alloys and Compounds. 319. 124-130 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.H.Okabe, A.Horiuchi, K.T.Jacob, Y.Waseda: "Electrochemical Properties of Li_3N Dissolved in Molten LiCl at 900K"J. Electrochem. Soc.. 148. E219-E226 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.H.Okabe, A.Horiuchi, K.T.Jacob, Y.Waseda: "Physicochemical Studies of Lithium Nitride in Molten LiCl-KCl"Materials Trans. JIM. 41. 822-830 (2000)

    • Related Report
      2001 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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