Grain boundaries and mechanical properties of nanocrystalline diamond films.

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Phase-pure nanocrystalline diamond thin films grown from plasmas of a hydrogen-poor carbon argon gas mixture have been analyzed regarding their hardness and elastic moduli by means of a microindentor and a scanning acoustic microscope.The films are superhard and the moduli rival single crystal diamond. In addition, Raman spectroscopy with an excitation wavelength of 1064 nm shows a peak at 1438 l/cm and no peak above 1500 l/cm, and X-ray photoelectron spectroscopy a shake-up loss at 4.2 eV. This gives strong evidence for the existence of solitary double bonds in the films. The hardness and elasticity of the films then are ... continued below

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9 p.

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Busmann, H.-G.; Pageler, A. & Gruen, D. M. August 6, 1999.

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Description

Phase-pure nanocrystalline diamond thin films grown from plasmas of a hydrogen-poor carbon argon gas mixture have been analyzed regarding their hardness and elastic moduli by means of a microindentor and a scanning acoustic microscope.The films are superhard and the moduli rival single crystal diamond. In addition, Raman spectroscopy with an excitation wavelength of 1064 nm shows a peak at 1438 l/cm and no peak above 1500 l/cm, and X-ray photoelectron spectroscopy a shake-up loss at 4.2 eV. This gives strong evidence for the existence of solitary double bonds in the films. The hardness and elasticity of the films then are explained by the assumption, that the solitary double bonds interconnect the nanocrystals in the films, leading to an intergrain boundary adhesion of similar strength as the intragrain diamond cohesion. The results are in good agreement with recent simulations of high-energy grain boundaries.

Physical Description

9 p.

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OSTI as DE00011733

Medium: P; Size: 9 pages

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  • International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials (ISMANAM-99), Dresden (DE), 08/30/1999--09/03/1999

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  • Report No.: ANL/CHM/CP-98669
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11733
  • Archival Resource Key: ark:/67531/metadc622466

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Office of Scientific & Technical Information Technical Reports

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  • August 6, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 8:16 p.m.

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Busmann, H.-G.; Pageler, A. & Gruen, D. M. Grain boundaries and mechanical properties of nanocrystalline diamond films., article, August 6, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc622466/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.