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Analysis of Structural Transition Phenomena in Amorphous Functional Materials

Research Project

Project/Area Number 09640595
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical chemistry
Research InstitutionChiba University

Principal Investigator

IWADATE Yasuhiko  Chiba Univ., Materials Technology, Associate Professor, 工学部, 助教授 (80168583)

Co-Investigator(Kenkyū-buntansha) NISHIYAMA Shin  Chiba Univ., Materials Technology, Research Associate, 工学部, 助手 (90241942)
HATTORI Takeo  Chiba Univ., Materials Technology, Professor, 工学部, 教授 (80009539)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsGlass / Melt / X-ray diffraction / Radial distribution / Borate / Tellurite / Network structure / Complex ion / 構造解析 / X線回析 / ボロキソル環
Research Abstract

X-ray diffraction analyses were performed for two B_2O_3-CaO and TeO_2-Li_2O glassy systems and two Na_3ErCl_6 and K_3ErCl_6 ionic melts. The samples of glasses and melts were prepared by rapidly quenching of the starting chemicals. The scattered intensity data were corrected in a conventional manner for background, polarization, absorption and Compton scattering, normalized to the coherent scattering intensity of the stoichiometric unit, and Fourier-transformed to obtain radial distribution functions, from which structural information was extracted. Most probable structural parameters such as coordination number. interatomic distance, and temperature factor were optimized for each atomic pair by the correlation method in the reciprocal lattice space as well as the radial distribution analysis in the real space in order to clarify the effects of oxide modifiers or alkali chlorides on the structure of glasses or melts.
The obtained results were as follows, (1) network structure consisting of boroxol rings was formed in B_2O_3 glass, (2) 4-coordinated borons transformed from 3-coordinated ones existed in B_2O_3-CaO glasses, (3) distortion of boroxol rings and decrease in symmetricity of rings were observed, (4) Ca_<2-> ions in B_2O_3-CaO glasses entered the octahedral cavity composed of six oxygen atoms, (5) network-forming units in TeO_2-Li_2O glasses were trigonal bipyramids TeO_4 and trigonal pyramids TeO_3 in which the former was thought to be transformed, via the transient species of polyhedra with non-bridging oxygens, into the latter with increasing Li_2O contents, (6) there were clustered complex ions in molten pure ErCl_<3+>, but the existence of discrete octahedral complex ions ErCl_6^<3->, due to cluster decomposition, was recognized in Na_3ErCl_6 and K_3ErCl_6 melts according to the geometrical calculations of bond lengths and bond angles.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 岩舘 泰彦: "X線回折法によるLi_2-TeO_2系ガラスのミクロ構造解析" 日本化学会誌. 1998・7. 460-464 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Iwadate: "X-ray diffraction study of Na_3ErCl_4 and K_3ErCl_4 melts" Electrochemistry. 印刷中.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yasuhiko Iwadate: "X-ray Diffraction Study on Microstructure of Li_2O-TeO_2 Glasses" Nippon Kagaku Kaishi. 1998-7. 460-464 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yasuhiko Iwadate: "X-ray diffraction study of Na_3ErCl_6 and K_3ErCl_6 melts" Eletrochemistry. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Iwadate: "X-ray Diffraction Study of Short Range Structure in B_2O_3-CaO Glasses" Journal of Alloys and Compounds. (発表予定).

    • Related Report
      1998 Annual Research Report
  • [Publications] 岩舘泰彦: "X線回折法によるLi_2O-TeO_2系ガラスのミクロ構造解析" 日本化学会誌. 1998・7. 460-464 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Iwadate: "X-ray diffraction study of Na_3ErCl_4 and K_3ErCl_4 melts" Electrochemistry. (発表予定).

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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