• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

RACAL STRUCTURES AND THERMODYNAMIC PROPERTIES OF HIGH DENSITY AMOR PHOUS

Research Project

Project/Area Number 11640478
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionOsaka University

Principal Investigator

OHTAKA Osamu  Graduate school of science, Osaka University Associate Professor, 大学院・理学研究科, 助教授 (40213748)

Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsEXAFS / GeO_2 / Ca(OH)_2 / high pressure / X-ray diffraction / pressure induced phase transition / coordination change / 非晶質 / 構造相転移 / 高圧相転移 / 放射光
Research Abstract

1. Using a large volume high pressure apparatus, quartz-type crystalline GeO_2 and Li_2O-4GeO_2 glass have been compressed up to 14 GPa at room temperature and their local structural changes have been investigated by an in-situ XAFS method. In quartz-type crystalline GeO_2, the change of the coordination number from 4 to 6 begins above 8 GPa and finishes below 12 GPa. On decompression, reversal transition begins below 8 GPa and there is a large hysteresis. Almost no sixfold coordination of Ge is preserved after releasing pressure. Change of coordination number in vitreous Li_2O-4GeO_2 begins above 6 GPa and is completed below 10 GPa. Reversal transition begins below 10 GPa and the hysteresis is smaller than that of quartz-type GeO_2. Change of coordination number in vitreous Li_2O-4GeO_2 is also reversal.
2. Utilizing the high pressure differential thermal analysis (HP-DTA) system in a cubic multianvil apparatus, we measured the melting points of portlandite, Ca(OH)2, up to 6 GPa and 1273 K.We detected endothermic behavior at the temperature and pressure conditions of 1027 K and 2.5 GPa, 1042 K and 3.5 GPa, 1025 K and 4.0 GPa, 959 K and 5.0 GPa, and 869 K and 6.0 GPa, respectively., due to melting of portlandite. By in-situ X-ray studies under pressure, the melting of portlandite was observed at 1003 K and 4.32 GPa and at 913 K and 5.81 GPa, respectively. Results of both HP-DTA and X-ray studieswere consistent within experimental error. The melting is congruent and has a negative Clapeyron slope, indicating that liquid Ca(OH)2 has higher densities than crystalline portlandite in this pressure range.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (43 results)

All Other

All Publications (43 results)

  • [Publications] A.Yoshiasa,T.Nagai,O.Ohtaka,O.Kamishima, and O.Shimomura: "Pressure and Temperature Dependence of EXAFS Debye-waller Factors in Diamond Type and Whitetin Type Germanium"J.Synchrotron Radiation. 6. 43-49 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka,M.Kikuchi,K.Nakajima,A.Yoshiasa and T.Yamanaka: "EXAFS Study of Densified GeO_2 Glasses"Jpn.J.Appl.Phys.. Vol 38. 164-167 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Nakatsuka,A.Yoshiasa,T.Yamanaka,O.Ohtaka,T.Katsura and E.Ito: "Symmetry Change of Majorite Solid-solution in the System Mg_3Al_2Si_3O_<12>-MgSiO_3"Am.Min. 84. 1135-1143 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Fukui,O.Ohtaka,T.Nagai,T.Katsura,K.Funakoshi and W.Utsumi: "Melting of Portlandite up to 6 GPa"Phys.Chem.Min.. 27. 367-370 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Tani,C.Yamanaka,M.Ikeya,O.Ohtaka,M.Takada, and T.Katsura: "Optically stimulated luminescence(OSL) study of synthetic stishovite, a high-pressure polymorph of silica"Radiat.Meas. 32. 473-477 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Tani,C.Yamanaka,M.Ikeya,O.Ohtaka and T.Katsura: "ESR study of a new electron center in synthetic stishovite, a high-pressure polymorph of silica"Appl.Magn.Reson.. 18. 559-564 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Fukui,O.Ohtaka,T.Katsura,K.Funakoshi,W.Utsumi and T.Kikegawa: "Relations of Ca(OH)_2 under High Pressure and Temperature"Science and Technology of High Pressure, edited by M.H.Manghnani,William J.Nellis and Malcolm F.Nicol. 554-557 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Nagai,T.Fujisawa,O.Ohtaka and T.Yamanaka: "Size Effects on the Quartz-Coecite Transformation Mechanism"Science and Technology of High Pressure, edited by M.H.Manghnani,William J.Nellis and Maicolm F.Nicol. 618-620 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Yamanaka,A.Yoshiasa,T.Nagai,O.Ohtaka,T.Hattori,T.Tuchiya and G.Yagyu: "Dynamical Observation of the Pressure-Induced Structure Change"Science and Technology of High Pressure, edited by M.H.Manghnani,William J.Nellis and Malcolm F.Nicol. 1053-1058 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Yoshiasa,M.Okube,O.Ohtaka,O.Kamishima,Y.Katayama: "Anharmonic Effective Pair Potentials of γ-and α-CuBr at High Pressure"Jpn.J.Appl.Phys.. 39. 6747-51 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka,A.Yoshiasa,H.Fukui,M.Murai,M.Okube,Y.Katayama,W.Utsumi and Y.Nishihata: "Structural changes of quartz-type crystalline and vitreous GeO_2"J.Synchrotron Rad. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka,H.Fukui,T.Kunisada,T.Fujisawa,K.Funakoshi,W.Utsumi,T.Irifune,K.Kuroda, and T.Kikegawa: "Phase Relations and Volume Changes of Hafnia under High-Pressure and High-Temperature"J.Am.Ceram.Soc. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka,H.Fukui,T.Kunisada,T.Fujisawa,K.Funakoshi,W.Utsumi,T.Irifune,K.Kuroda, and T.Kikegawa: "Phase Relations and Equations of State of Zirconia under High-Pressure and High-Temperature"Phys.Rev.B. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 浦川啓,大高理,船越賢一,内海渉: "高圧地球科学実験ステーション(BL04B1)の研究から"日本結晶学会誌. 42. 24-32 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Yoshiasa, T.Nagai, O.Ohtaka, O.Kamishima, and O.Shimomura: "Pressure and Temperature Dependence of EXAFS Debye-waller Factors in Diamond Type and Whitetin Type Germanium"J.Synchrotron Radiation. 6. 43-49 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka, M.Kikuchi, K.Nakajima, A.Yoshiasa and T.Yamanaka: "EXAFS Study of Denslfied GeO_2 Glasses"Jpn.J.Appl.Phys.. Vol 38. 164-167 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Nakatsuka, A.Yoshiasa, T.Yamanaka, O.Ohtaka, T.Katsura and E.Ito: "Symmetry Change of Majorite Solid-solution in the System Mg_3Al_2Si_3O_<12>-MgSiO_3""Am.Min.. 84. 1135-1143 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Fukui, O.Ohtaka, T.Nagai, T.Katsura, K.Funakoshi and W.Utsumi: "Melting of Portlandite up to 6 GPa"Phys.Chem.Min.. 27. 367-370 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Tani, C.Yamanaka, M.Ikeya, O.Ohtaka, M.Takada, and T.Katsura: "Optically stimulated luminescence (OSL) study of synthetic stishovite"a high-pressure polymorph of silica" Radial.Meas.. 32. 473-477 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Tani, C.Yamanaka, M.Ikeya, O.Ohtaka and T.Katsura: "ESR study of a new electron center in synthetic stishovite, a high-pressure polymorph of silica"Appl.Magn.Reson.. 18. 559-564 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Fukui, O.Ohtaka, T.Katsura, K.Funakoshi, W.Utsumi and T.Kikegawa: "Relations of Ca(OH)_2 under High Pressure and Temperature"Science and Technology of High Pressure, edited by M.H.Manghnani, William J.Nellis and Malcolm F.Nicol.. 554-557 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Nagai, T.Fujisawa, O.Ohtaka and T.Yamanaka: "Size Effects on the Quartz-Coecite Transformation Mechanism"Science and Technology of High Pressure, edited by M.H.Manghnani, William J.Nellis and Malcolm F.Nicol. 618-620 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Yamanaka, A.Yoshiasa, T.Nagai, O.Ohtaka, T.Hattori, T.Tuchiya and G.Yagyu: "Dynamical Observation of the Pressure-Induced Structure Change"Science and Technology of High Pressure, edited by M.H.Manghnani, William J.Nellis and Malcolm F.Nicol. 1053-1058 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Yoshiasa, M.Okube, O.Ohtaka, O Kamishima, Y.Katayama: "Anharmonic Effective Pair Potentials of γ-and α-CuBr at High Pressure"Jpn.J.Appl.Phys.. 39. 6747-51 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka, A.Yoshiasa, H.Fukuj, M.Murai, M.Okube, Y.Katayama, W.Utsumi and Y.Nishihata: "Structural changes of quartz-type crystalline and vitreous GeO_2"J.Synchrotron Rad.. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka, H.Fukui, T.Kunisada , T.Fujisawa, K.Funakoshi, W.Utsumi, T.Irifune, K.Kuroda, and T.Kikegawa: "Phase Relations and Volume Changes of Hafnia under High-Pressure and High-Temperature"J.Am.Ceram.Soc.. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Ohtaka, H.Fukui, T.Kunisada, T.Fujisawa, K.Funakoshi, W.Utsumi, T.Irifune, K.Kuroda, and T.Kikegawa: "Phase Relations and Equations of State of Zirconia under High-Pressure and High-Temperature"Phys.Rev.B. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Yoshiasa,T.Nagai,O.Ohtaka,O.Kamishima,and O.Shimomura: ""Pressure and Temperature Dependence of EXAFS Debye-waller Factors in Diamond Type and Whitetin Type Germanium""J. Synchrotron Radiation. 6. 43-49 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] O.Ohtaka,M.Kikuchi,K.Nakajima,A.Yoshiasa and T.Yamanaka: ""EXAFS Study of Densified GeO_2 Glasses""Jpn.J.Appl.Phys.,. Vol38. 164-167 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Nakatsuka,A.Yoshiasa,T.Yamanaka,O.Ohtaka,T.Katsura and E.Ito: ""Symmetry Change of Majorite Solid-solution in the System Mg_3Al_2Si_3O_<12>-MgSiO_3""Am.Min.. 84. 1135-1143 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Fukui,O.Ohtaka,T.Nagai,T.Katsura,K.Funakoshi and W.Utsumi: ""Melting of Portlandite up to 6 GPa""Phys.Chem.Min.,. 27. 367-370 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Tani,C.Yamanaka,M.Ikeya,O.Ohtaka,M.Takada,and T.Katsura: ""Optically stimulated luminescence(OSL) study of synthetic stishovite", a high-pressure polymorph of silica""Radiat.Meas.. 32. 473-477 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Tani,C.Yamanaka,M.Ikeya,O.Ohtaka and T.Katsura: ""ESR study of a new electron center in synthetic stishovite,a high-pressure polymorph of silica""Appl.Magn.Reson.. 18. 559-564 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Fukui,O.Ohtaka,T.Katsura,K.Funakoshi,W.Utsumi and T.Kikegawa: ""Relations of Ca(OH)_2 under High Pressure and Temperature" "Science and Technology of High Pressure, edited by M.H.Manghnani, William J.Nellis and Malcolm F.Nicol. 554-557 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nagai,T.Fujisawa,O.Ohtaka and T.Yamanaka: ""Size Effects on the Quartz-Coecite Transformation Mechanism""Science and Technology of High Pressure, edited by M.H.Manghnani, William J.Nellis and Malcolm F.Nicol.. 618-620 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Yamanaka,A.Yoshiasa,T.Nagai,O.Ohtaka,T.Hattori,T.Tuchiya and G.Yagyu: ""Dynamical Observation of the Pressure-Induced Structure Change""Science and Technology of High Pressure, edited by M.H.Manghnani, William J.Nellis and Malcolm F.Nicol.. 1053-1058 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Yoshiasa,M.Okube,O.Ohtaka,O Kamishima,Y.Katayama: ""Anharmonic Effective Pair Potentials of γ-and α-CuBr at High Pressure""Jpn.J.Appl.Phys.. 39. 6747-51 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] O.Ohtaka,A.Yoshiasa,H.Fukui,M.Murai,M.Okube,Y.Katayama,W.Utsumi and Y.Nishihata: ""Structural changes of quartz-type crystalline and vitreous GeO_2"."J.Synchrotron Rad.. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] O.Ohtaka,H.Fukui,T.Kunisada,T.Fujisawa,K.Funakoshi,W.Utsumi,T.Irifune,K.Kuroda,and T.Kikegawa: ""Phase Relations and Volume Changes of Hafnia under High-Pressure and High-Temperature,""J.Am.Ceram.Soc.. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 浦川啓,大高理,船越賢一,内海渉: ""高圧地球科学実験ステーション(BL04B1)の研究から""日本結晶学会誌. 42. 24-32 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Fukui et al.: "MeHing of portlandite up to 6GPa"Phys,Chem,Solid. (in press).

    • Related Report
      1999 Annual Research Report
  • [Publications] O.Ohtaka et al.: "EXAFS study of densified GeO_2 glasses"Jpn.J.Appl.Phys.. 38. 164-167 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] A.Yoshiasa et al.: "Pressure and temperature dependence of EXAFS waller factors in diamond Type and white tin type Ge"J.Synchrotron.radiation. 6. 43-49 (1999)

    • Related Report
      1999 Annual Research Report

URL: 

Published: 1999-04-01   Modified: 2021-09-02  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi