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The Crystal chemistry of the mineral solid solution by EXAFS spectroscopy.

Research Project

Project/Area Number 62420017
Research Category

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

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionThe University of Tokushima (1988-1989)
Osaka University (1987)

Principal Investigator

KOTO Kichiro  Tokushima Univ. Fac. Integ. Arts & Sci., Prof., 総合科学部, 教授 (40029872)

Co-Investigator(Kenkyū-buntansha) YOSHIASA Akira  Hiroshima Univ., Fac. Sci., Res. Assoc., 理学部, 助手 (00191536)
KANAMARU Fumikazu  Osaka Univ., I.S.I.R., Prof., 産業科学研究所, 教授 (40029848)
SAITO Takahito  Tokushima Univ. Fac. Integ. Arts & Sci., Res. Assoc., 総合科学部, 助手 (60201505)
MIZUNO Kiyoshi  Tokushima Univ. Fac. Integ. Arts & Sci., Prof., 総合科学部, 教授 (40087094)
SHIOTA Thugio  Tokushima Univ. Fac. Integ. Arts & Sci., Assoc. Prof., 総合科学部, 助教授 (90035337)
寺尾 博充  徳島大学, 総合科学部, 助教授 (40035340)
高橋 昌男  大阪大学, 産業科学研究所, 助手 (00188054)
延谷 宏治  大阪大学, 産業科学研究所, 助手 (70156222)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥31,600,000 (Direct Cost: ¥31,600,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥26,200,000 (Direct Cost: ¥26,200,000)
Fiscal Year 1987: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsSolid Solution / EXAFS / X-ray Spectroscopy / Minerals / Local Structure / Crystal Chemistry / エクザフス
Research Abstract

Rock-forming minerals, sulfides and various metal oxides generally form solid solutions with wide compositional range. Microstructures of atomic scale are basically important to elucidate the crystal chemistry, thermal history and physical property. This study has been done to clarify the crystal chemistry of the solid solution based on the local structure obtained from the analysis of EXAFS spectroscopy. The main results are summarized as follows; (1)The rock-forming mineral olivines with the various compositions in the Mg_2SiO_4 - Fe_2SiO_4 system have been investigated by EXAFS. The local structure of Fe atom in the olivine solid solution is independent on the composition and is nearly the same as in the structure of fayalite. (2) The sulfides minerals, cubanite and chalcopyrite have been investigated using the EXAFS at the Fe-K and Cu-K edges. The local structures of these minerals in the ordered phase are maintained even in the disordered phase of the high temperature form. The results are essentially important to elucidate the order-disorder transition mechanism in these compounds. (3) The stability and ionic conductivity versus composition of the fluorite- type solid solution in the Bi_2O_3-Gd_2O_3 system were explained by forming clusters of regular oxygen cube around Gd ions, which is compared with distorted oxygen polyhedra around Bi ions. It has been clarified in this study that the local structure of the specific kinds of atoms in the solid solution has close relation with its chemical composition, stability and physical property.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] A.Yoshiasa F.Kanamaru K.Koto: "Local structure of the superionic conducting α-Agl type AgI _<1-x>Br_x solid solution" Solid State Ionics. 27. 275-283 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto D.Komyoji A.Yoshiasa F.Kanamaru S.Emura: "Crystallization of Gd_2O_3stalilized zirconia from gel by EXAFS" Photon Factory Activity Report. 5. 215 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto S.Emura A.Yoshiasa: "Structure of liquid state of Bi_20_3 by EXAFS" Photon Factory Activity Report. 6. 81 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto H.Ito A.Yoshiasa F.Kanamaru S.Emura: "EXAFS study of the fluorite-type compounds in the system Bi_2O_3-Gd_20_3" Slid State Ionics,in press.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] A.Yoshiasa H.Maeda T.Ishii K.Koto: "EXAFS studies on anharmonic thermal vibrations in AgI" Solid State Ionics,in press.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto S.Emura Y.Ito N.Aikawa F.Takei: "EXAFS Study of the solid solution Mg_2SiO_4-Fe_2SiO_4" in preparation.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] A.Yoshiasa F.Kanamaru K.Koto: "Local structure of the superionic conducting alpha-AgI type AgI_<1-x>Br_x solid solution" Solid State Ionics. 27. 275-283 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto D.Komyoji A.Yoshiasa F.Kanamaru S.Emura: "Crystallization of Gd_2O_3 stalilized zirconia from gel by EXAFS" Photon Factory Activity Report No.5, 215 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto S.Emura A.Yoshiasa: "Structure of liquid state of Bi_2O_3 by EXAFS" Photon Factory Activity Report No.6, 81 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto H.Ito A.Yoshiasa F.Kanamaru S.Emura: "EXAFS study of the fluorite-type compounds in the system Bi_2O_3-Gd_2O_3" Solid State Ionics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] A.Yoshiasa H.Maeda T.Ishii K.Koto: "EXAFS studies on anharmonic thermal vibrations in AgI" Solid State Ionics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] K.Koto S.Emura Y.Ito N.Aikawa F.Takei: "EXAFS study of the solid solution Mg_2SiO_4-Fe_2SiO_4"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T.Moriga,A.Yoshiasa,F.Kanamaru,K.Koto: "Crystal structure analyses of the pyrochlore- and fluorite-type Zr_2Gd_2O_7 and anti-phase domain structure" Solid State Ionics. 31. 319-328 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] K.Koto,H.Ito,A.Yoshiasa,F.Kanamaru,S.Emura.: "EXAFS study of the fluorite-type compounds in the system Bi_2O_3-Gd_2O_3" Solid State Ionics.

    • Related Report
      1989 Annual Research Report
  • [Publications] K.Koto,S.Emura,Y.Ito,N.Aikawa,F.Takei: "EXAFS study of the solid solution Mg_2SiO_4-Fe_2SiO_4"

    • Related Report
      1989 Annual Research Report
  • [Publications] K.Koto,et al.: Photon Factory Activity Report. #5. 202 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] K.Koto,et al.: Photon Factory Activity Report. #5. 215 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] A.Yoshiasa,et al.: Solid State Ionics. 27. 275-283 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] A.Yoshiasa,et al.: Solid State Ionics. 27. 267-274 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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