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Neutron diffraction study of structure of molten alkali hydroxides

Research Project

Project/Area Number 63470008
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 構造化学
Research InstitutionTokyo Institute of Technology

Principal Investigator

OKADA Isao  Tokyo Inst. Tech., Dept. Electronic Chem., Professor, 総合理工学研究科, 教授 (60011582)

Co-Investigator(Kenkyū-buntansha) HABASAKI Junko  Tokyo Inst. Tech., Dept. Electronic Chem., Assistant Instructor, 総合理工学研究科, 教務技官 (10133331)
OKAZAKI Susumu  Tokyo Inst. Tech., Dept. Electronic Chem., Research Associate, 総合理工学研究科, 助手 (70194339)
ODAWARA Osamu  Tokyo Inst. Tech., Dept. Electronic Chem., Associate Professor, 総合理工学研究科学, 助教授 (90185611)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1989: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1988: ¥3,800,000 (Direct Cost: ¥3,800,000)
KeywordsMolten Salt / Hydroxide / Structure / Neutron Diffraction / Raman Scattering / Molecular Dynamics Simulation / Rotational Relaxation / Vibrational Relaxation / 計算機シミュレーション / 構造
Research Abstract

1. Neutron scattering measurements have been performed for molten LiOD, NAOD, and KOD using a nickel metal cell. Large scattering intensities by the cell could be successfully subtracted from the observed total intensities. The structure factors and their Fourier transformations reveal that the polyatomic ion can possess an effective ionic radius.
2. Fine structure of molten LiOH has been elucidated from molecular dynamics simulation combined with the neutron scattering measurement.
(1) Li^+ ion coordinates OH^- ion mainly on the 0 atom side. The most probable location is that r_<LiO> = 1.95 A^^゚ and rheta_<Li-O-H> = 115゚, which is somewhat different from that of LiOH molecule in vacuum.
(2) The Li^+ ion coordinates in a certain probability also on the H atom side. This is one of the characteristics of liquids which cannot be found in the solid.
(3) With regard to the framework structure of the melt, OH^- ion takes tetrahedral coordination around Li^+ ion. On the other hand, four Li^+ ions coordinate just to the O atom of the OH^- ion to form a slightly folded square plane.
3. Polarized and depolarized Raman scattering measurements have also been accomplished for LiOH, NaOH, KOH, RbOH, and CsOH. Band contour analysis revealed that vibrational relaxation rate depends largely on the counter cations, while rotational relaxation rate does not so much. Also in the rotational autocor relation function, oscillatory rapid decay at small t and exponential slow one at large t are found. The former is caused by the liberation of the OH^- ion and the latter seems to be accompanied by structural rearrangement of the surrounding Li^+ ions.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] A.Endoh: "Structural study on molten(^7Li,K)Cl and(^7Li,Na,K)Cl eutectic composition by pulsed neutron diffraction" Z.Naturforsch.43a. 961-964 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] C.Yang: "Internal cation mobilities in the binary system NaOH-KOH" J.Electrochem.Soc.136. 120-124 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Okazaki: "Li^+-OH^-intra and interionic interactions derived from decomposition of ab initio three body force." J.Chem.Phys.90. 5595-5605 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Okazaki: "Raman spectroscopic study on the vibrational and rotational relaxzation of OH^- ion in molten LiOH." J.Chem.Phys.91. 5587-5591 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Matsumoto: "Raman spectroscopic study of vibrational and rotational relaxation of the NO_3-ion in molten binary systems." Mol.Phys.68. 671-680 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Matsumoto: "Raman spectroscopic study of vibrational and rotational relaxation of the CO_3^<2->ion in molten Li_2CO_3." J.Chem.Phys.92. 1515-1516 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N.Ohtori: "Pulsed neutron diffraction study on molten NaOD structure using a nickel metal cell." J.Phys.Condesed Matter(投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Okazaki: "Molecular dynamics studies on molten alkali hydroxides I.Static prperties.of molten LiOH." J.Chem.Phys.(印刷中). 92. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 岡田勲: "分子シミュレ-ション入門" 海文堂, 227 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] A. Endoh: "Structural study on molten (^7Li,K)Cl and (^7Li,Na,K)Cl of the eutectic composition by pulsed neutron diffraction" Z. Naturforsch.43a. 961-964 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] C. Yang: "Internal cation mobilities in the binary system NaOH-KOH" J. Electrochem. Soc.136. 120-124 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S. Okazaki: "Li^+-OH^- intra- and interionic interactions derived from decomposition of ab initio three body force" J. Chem. Phys.90. 5595-5605 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S. Okazaki: "Raman spectroscopic study of the vibrational and rotational relaxation of OH^- ion in molten LiOH" J. Chem. Phys.91. 5587-5591 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Matsumoto: "Raman spectroscopic study of the vibrational and rotational relaxation of the NO^-_ ion in molten binary systems" Mol. Phys.68. 671-680 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Matsumoto: "Raman spectroscopic study of vibrational and rotational relaxation of the CO^2-_ ion in molten Li_2CO_3" J. Chem Phys.92. 1515-1516 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N. Ohtori: "Pulsed neutron diffraction study on molten NaOD structure using a nickel metal cell" J. Phys. Condensed Matter.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S. Okazaki: "Molecular dynamics studies on molten alkali hydroxides. I. Static properties of molten LiOH" J. Chem. Phys.92. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] I. Okada: Introduction to molecular simulation. Kaibun-do, 227 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Okazaki: "Li^+-OH^-intra and interionic interactions derived from decomposition of ab initio three body force." J.Chem.Phys.90. 5595-5605 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] S.Okazaki: "Raman spectroscopic study on the vibrational and rotational relaxation of OH^-ion in molten LiOH." J.Chem.Phys.91. 5587-5591 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Matsumoto: "Raman spectroscopic study of vibrational and rotational relaxation of the NO_3^-ion in molten binary systems." Mol.Phys.68. 671-680 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Matsumoto: "Raman spectroscopic study of vibrational and rotational relaxation of the CO_3^<2->ion in molten Li_2CO_3." J.Chem.Phys.92. 1515-1516 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] N.Ohtori: "Pulsed neutron diffraction study on molten NaOD structure using a nickel metal cell." J.Phys.Condesed Matter.

    • Related Report
      1989 Annual Research Report
  • [Publications] S.Okazaki: "Molecular dynamics studies on molten alkali hydroxides I.Static prperties of molten LiOH." J.Chem.Phys.

    • Related Report
      1989 Annual Research Report
  • [Publications] 岡田勲: "分子シミュレ-ション入門" 海文堂, 227 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Akira,Endoh: Z.Naturforsch.43a. 961-964 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Chao-cheng,Yang: J.Electrochem.Soc.136. 120-124 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Susumu,Okazaki: J.Chem.Phys.90. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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