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Study on Formation Condition and Cation Site Occupancy in Garnets

Research Project

Project/Area Number 63460052
Research Category

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

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionTokyo Institute of Technology

Principal Investigator

OKADA Kiyoshi (1989-1990)  Tokyo Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80114859)

森川 日出貴 (1988)  東京工業大学, 工業材料研究所, 助教授 (80016815)

Co-Investigator(Kenkyū-buntansha) MORIKAWA Hideki  Tokyo Institute of Technology, Res. Lab. of Eng. Mater., Associate Professor, 工業材料研究所, 助教授 (80016815)
HAYASHI Shigeo  Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (20218572)
TANAKA Kiyoaki  Tokyo Institute of technology, Res. Lab. of Eng. Mater., Research Associate, 工業材料研究所, 助手 (00092560)
岡田 清  東京工業大学, 工学部, 助教授 (80114859)
丸茂 文幸  東京工業大学, 工業材料研究所, 教授 (10013492)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1990: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1988: ¥3,300,000 (Direct Cost: ¥3,300,000)
KeywordsGarnets / Rare earth garnets / Crystal structure / EXAFS spectroscopy / パイロ-プ / アルマンディン / アンドラダイト / 分析電顕 / パイロープ / 希土類ガーネット / EXAFS
Research Abstract

1. Natural garnets
Site occupancies in three kinds of Fe including garnets, i. e., pyrope(Py), andradite(An) and almandine(Al), have been investigated by EXAFS spectroscopy, single crystal X-ray diffraction (XRD) and analytical TEM methods. The R factors obtained by XRD structural refinement were under 2% for Py and Al but 4.8% for An. Site occupancies for Py, An and Al are as follows ;
Py : (Fe^2+_. _<73>Ca_0. _<61>Mn_0. _<10>Mg_2. _<69>)(Al_3. _<98>Fe^3+_. _<03>)(Si_5. _<49>Al_0. _<58>)O_<24>,
An : (Fe^2+_. _<83>Ca_5. _<06>Mn_0. _<20>)(Al_1. _<94>Fe^3+_. _<91>)(Si_5. _<99>Al_0. _<07>)O_<24>,
Al : (Fe^2+_. _<87>Ca_0. _<13>Mn_0. _<19>Mg_0. _<91>)(Al_3. _<94>Fe^3+_. _<03>)(Si_5. _<93>Al_0. _<06>)O_<24>.
Local structure around Fe ion has been examined by EXAFS using absorption spectra in the vicinity of K absorption edge. Interatomic distances of Fe-O in Py, An and Al were 2.26, 2.03 and 2.29A, respectively. Since the ionic dadii of Mg and Fe^<2+> are almost same, those obtained from XRD in Py and Al showed no significant difference. On the other hand, some difference in Fe-O distance can be detected by EXAFS because there is a difference in the ratio of Fe ion in 8 and 6 coordination sites for Py and Al. In this way, examination by both EXAFS and XRD was found to be very effective.
2. Synthetic rare earth garnets
Recently various kinds of garnets have been synthesized. Formation of facet is usually reported in the Czechralski crystal growth. The slight difference of crystals between facet and off facet regions is considered to yield cracking in the crystals. It was clarified from the precise structure refinemnt by XRD that there is little difference in chemical composition but a small difference in interatomic distances.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Y.TABIRA,K.TANAKA,H.MORIKAWA,F.MARUMO: "CoordinationofFeinGarnetsbyEXAFSSpectroscopy" PhotonFactoryActivityReport. 5. 177 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] H.MORIKAWA,Y.SHIMIZUGAWA,Y.TABIRA,T.SATO: "CharacteriZationofFe_<80>P_<16>C_4AmorphousAlloyPowdrsMadebyRapidQuenchingWaterAtomizationProcess" J.NonーCryst.Solids. 110. 74-80 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K.OHGAKI,M.OHGAKI,K.TANAKA,F.MARUMO,H.TAKEI: "ElectronーDensityDistributionnIlmeniteーTypeCrystals,IV,Iron(II)Titanium(IV)Trioxide,FetiO_3" Miner.J.14(5). 179-90 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 岡田 清・大津 賀望: "種々のカオリン鉱物の分析電子顕微鏡による化学組成分析" 鉱物雑. 19(特). 135-42 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] F.MARUMO,H.MORIKAWA,Y.SHIMIZUGAWA,M.TOKONAMI,M.MIYAKE,K.OHUMI,S.SASAKI: "DiffractometerforSynchrotronRadiationStructuralStudiesofHighTemperatureMelts" Rev.Sci.Instru.60(7). 2421-24 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 岡田 清・坂本 尚史・林 久人: "分析電子顕微鏡を用いた粘土鉱物の化学分析における問題点" 鉱物雑. 19(特). 143-50 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Tabira, K. Tanaka, H. Morikawa and F. Marumo: "Coordination of Fe in Garnets by EXAFS Spectroscopy" Photon Factory Act. Rep.5. 177 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] H. Morikawa, Y. Shimizugawa, Y. Tabira and T. Sato: "Characterization of Fe_<80>P_<16>C_4 Amorphous Alloy Powders Made by Rapid Quenching Water Atomization Process" J. Non-Cryst. Solids. 110. 74-80 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Ohgaki, M. Ohgaki, K. Tanaka F. Marumo and H. Takei: "Electron-Density Distribution in Ilmenite-Type Crystals, IV. Iron(II) Titanium (IV) Trioxide, FeTiO_3" Miner. J.14(5). 179-90 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Okada and N. Otsuka: "Chemical Composition Analysis of Various Kaolin Group Minerals by Analytical Transmission Electron Microscope" Kobutsugaku Zasshi. 19(S). 135-42 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] F. Marumo, H. Morikawa, Y. Shimizugawa, M. Tokonami, M. Miyake, K. Ohumi and S. Sasaki: "Diffractometer for Synchrotron Radiation Structural Studies of High Temperature Melts" Rev. Sci. Instru.60(7). 2421-24 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Okada, T. Sakamoto and H. Hayashi: "Some Problems on Chemical Composition Analysis of Clay Minerals by Analytical Transmission Electron Microscope" Kobutsugaku Zasshi. 19(S). 143-50 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] F.Marumo,H.Morikawa,Y.Shimizugawa,M.Tokonami,N.Miyake,K.Ohumi and S.Sasaki: "Diffractometer for Synchrotron Radiation Structural Studies of Hig Temperature Melts" Rev,Sci,Instru.60(7). 2421-24 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡田 清,坂本 尚史,林 久人: "分析電子顕微鏡を用いた粘土鉱物の化学分析における問題点" 鉱物雑. 19. 143-50 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] H.Morikawa,Y.Shimizugawa,Y.Tabira,T.Sato: "Characterization of Fe_<80>P_<16>C_4amorphous alloy powders made by rapid guenching water atomization process" J.Non-Cryst,Solids. 110. 74-80 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] K.Ohgaki,M.Ohgaki,K.Tanaka,F.Marumo,H.Takei: "Electron-density distribution in ilmenite-type crystals,IV Iron(II)tilanium(IV)trioxide,FeTiO_3" Miner.J.14(5). 179-190 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 岡田清,大津賀望: "種々のカオリン鉱物の分析電子顕微鏡による化学組成分析" 鉱物雑.

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.TABIRA;K.TANAKA;H.MORIKAWA;F.MARUMO: Photon Factory Activity Report. 5. 177 (1987)

    • Related Report
      1988 Annual Research Report

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

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