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1995 Fiscal Year Final Research Report Summary

Microtextures of synthetic diamond by Shock Compresion, Chemical Vapor Deposit, and Statick Compression and Origin of Cosmic diamond.

Research Project

Project/Area Number 06640612
Research Category

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

Allocation TypeSingle-year Grants
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionTokyo Institute of Technology

Principal Investigator

YAGI Hisako (平井 寿子)  Tokyo Institute of Technology, Research Laboratory of Engineering Materials, Research Associate, 工業材料研究所, 助手 (60218758)

Co-Investigator(Kenkyū-buntansha) KONDO Ken-ichi  Tokyo Institute of Technology, Research Laboratory of Engineering Materials, pro, 工業材料研究所, 教授 (50111670)
Project Period (FY) 1994 – 1995
KeywordsCosmic diamond / Synnthetic diamond / microtectures / shock compression / Chemical Vapor Deposit / Static compression
Research Abstract

Predominant parameters in the shock-induced transition from graphite materials to diamond were examined in the present study by using quenching and powder methods under pressures of 50 to 60 GPa and 80 to 90 GPa, respectively, in the temperature range from 750 to 3500 K.Effects of the material parameters of the starting graphite-i.e., crystallite size and crystallinity-were distinguished from effects of the experimental parameters by standardizing the shock conditions for the materials examined. In addition, only a few graphite materials possessing wholly identical parameters throughout were selected as starting materials.
Detailed characterization by transmission electron microscopy and electron energy-loss spectroscopy revealed that the transition ratios of diamond and the degrees of graphitization varied with those parameters. The various changes observed were plotted in terms of pressure, temperature, and material-parameter axs to create a tentative Pressure-Temperature-Material dia … More gram representing the behavior of the graphite materials under shock compression. The material parameters of the initial graphite structure primarily affected the diamond transition : The lower the crystallinity and crystallite size, the more easily the diamond transition occurred in the case of a reconstructive mechanism. Smaller crystallite size and lower crystallinity elevated the initial energy states of the graphite materials because of surface energy and strain energy, making it relatively easier to transcend the activation-energy barrier to diamond transition. Temperature was fairly effective and pressure ineffective in regard to the diamond transition, a result consistent with the belief that the transition is a diffusion-controlled process. Moreover, differentiation of the transition pathways, the diamond transition, and graphitization fit a concept of alternative metastable behavior ; graphitization was more favored kinetically than diamond transition under the shock conditions examined. Less

  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Hirai,H.,and Kondo,K.: "Changes in elctrionic state and structure from C_<60> fullerene to sp3 amorphous" Phys.Rev.B,. 51. 15555-15558 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Tabira,Y.: "Radial distribution function of amorphous diamond shock-induced from C_<60> fullerene." Phys.Rev.B. 52. 6162-6165 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Kukino,S.: "Predominant Prameters in Shock-Induced Transition from Graphite to Diamond" J.Appl.Phys.78. 3052-3059 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Kukino,S.,: "Dependence of diamond transition on microtexture in starting materials under shock compression." J.Am.Ceram.Soc.2079-2084 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Kondo,K.: "Diamond synthesis by shock compression from a thin graphite plate with suppressed regraphitization." Carbon. 33. 203-208 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Ohwada,T.: "Shock compression of graphite materials bering different microextures and their relations to diamond transition." J.Mat.Res.10. 175-182 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,and Kondo,K.: "EELS and eletron diifractometry on a transition from C_<60> fullerene to diamond." Fullerene Science and Technology. 3. 369-376 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Kondo,K,: "Amorphous diamond from C_<60> fullerene." Appl.Phys.Lett.64. 1797-1799 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,& Kondo,K.: "Amorphous diamond from C_<60> fullerene by shock compression and rapid quenching." High-Pressure Science and Technology-1993,Edited by S.C.Schmidt,J.W.Shaner,G.A.Samara,AIP Press. 659-662 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,& Kondo,K.,: "C_<60> fullerene under high pressure ; a transition to diamond and to an amorphous diamond under shock-compression." Advanced Materials '93I/B : edited by M. Homma et al.(Elsevier Science). B. 1127-1132 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,& Kondo,K.: "Mechnisms for consolidation of ultrafine Si_3N_4powder and for transition of α-to β-form under shock compression." Advanced Materials '93,I/A : edited by N.Mizutani el al.(Elsevier Science,. B. 689-692 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,& Kondo,K.: "A possible genesis of cosmic diamond ; a transition of C_<60> fullerene to diamond under shock compression." Earthscience. 48. 387-393 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,& Kondo,K.: "Shock-compacted Si_3N_4 Nanocrystalline Ceramics : Mechanisms of Consolidation and Transition frrm α-to β-form." J.Am.Ceram.Soc.77. 487-492 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Kondo,K.: "Process of C_<60> fullerene collapse to sp^3 bond formation under shock compression." Avanced in New Diamond Science and Technology,Editors : N.Fujimori,O.Fukunaga,M.Kamo,K.Kobashi MYU Tokyo. 576-583 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai,H.,Kondo,K.: "Transition process to diamond from C_<60> fullerene." Chemical Physics Letters. 226. 595-599 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirai, H., and Kondo, K.: "Changes in elctrionic state and structure from C_<60> fullerene to sp^3 amorphous." Phys.Rev.B,51(21). 15555-15558 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Tabira, Y., Kondo, K.Oikawa, T., and Ishizawa, N.: "Radial distribution function of amorphous diamond shock-induced from C_<60> fullerene." Phys.Rev.B.52. 6162-6165

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Kukino, S., and Kondo, K.: "Predominant Prameters in Shock-Induced Transition from Graphite to Diamond" J.Appl.Phys.78 (5). 3052-3059 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Kukino, S., Ohwada, T., and Kondo, K.: "Dependence of diamond transition on microtexture in starting materials under shock compression." J.Am.Ceram.Soc.78 (8). 2079-2084 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., and Kondo, K.: "EELS and electron diifractometry on a transision from C_<60> fullerene to diamond." Fullerene Science and Technology. 3 (4). 369-376 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Kondo, K.and Ohwada, T.: "Diamond synthesis by shock compression from a thin graphite plate with suppressed regraphitization." Carbon. 33 (2). 203-208 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Ohwada, T., and Kondo, K: "Shock compression of graphite materials bering different microextures and their relations to diamond transition." J.Mat.Res.10 (1). 175-182 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Kondo, K.Yoshizawa, N., & Shiraishi, M.: "Amorphous diamond from C_<60> fullerene." Appl.Phys.Lett.64 (14). 1797-1799 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., & Kondo, K.: "Amorphous diamond from C_<60> fullerene by shock compression and rapid quenching." High-Pressure Science and Technology-1993, Edited by S.C.Schmidt, J.W.Shaner, G.A.Samara, M.Ross, AIP Press. 659-662 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., & Kondo, K.: "C_<60> fullerene under high pressure ; a transition to diamond and to an amorphous diamond under shock-compression." Advanced Materials '93 I/B : edited by M.Homma et al. (Elsevier Science, V.B.1127-1132). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., & Kondo, K.: "Mechnisms for consolidation of ultrafine Si_3N_4 powder and for transition of alpha- to beta-form under shock compression." Advanced Materials '93, I/A : edited by N.Mizutani et al. (Elsevier Science, V.B.689-692). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., & Kondo, K.: "A possible genesis of cosmic diamond ; a transition of C_<60> fullerene to diamond under shock compression." Earthscience. 48 (4). 387-393 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., & Kondo, K.: "Shock-compacted Si_3N_4 Nanocrystalline Ceramics : Mechanisms of Consolidation and Transition frrm alpha- to beta-form." J.Am.Ceram.Soc.77 (2). 487-492 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Kondo, K., & Yoshizawa, N.: "Process of C_<60> fullerene collapse to sp^3 bond formation under shock compression" Avanced in New Diamond Science and Technology, Editors : N.Fujimori, O.Fukunaga, M.Kamo, K.Kobashi, M.Yoshikawa, MYU Tokyo 1994. 583-576 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirai, H., Kondo, K., Yoshizawa, N., & Shiraishi, M.: "Transition process to diamond from C_<60> fullerene." Chemical Physics Letters. 226. 595-599 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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