Effect of Grinding on the Stucture of Glassy Carbon

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An earlier suggestion that various allotropic forms of carbon preexist as micron size crystallites in glassy carbon was investigated. Samples previously heated only to 1000 C and thinned by crushing (grinding) or by ion melting and observed using transmission electron diffraction and microscopy gave single crystal or spotty ring patterns for the former but only diffuse rings for the latter. Wide range X-ray diffraction, small angle X-ray scattering, density and surface area measurements of as received plate and ground material show that grinding flattens the internal pore structure of the material, decreasing the specific surface area by 25 percent and ... continued below

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15 p.

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Baker, D. F.; Bragg, R. H. & Rao, A. S. December 1, 1979.

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Description

An earlier suggestion that various allotropic forms of carbon preexist as micron size crystallites in glassy carbon was investigated. Samples previously heated only to 1000 C and thinned by crushing (grinding) or by ion melting and observed using transmission electron diffraction and microscopy gave single crystal or spotty ring patterns for the former but only diffuse rings for the latter. Wide range X-ray diffraction, small angle X-ray scattering, density and surface area measurements of as received plate and ground material show that grinding flattens the internal pore structure of the material, decreasing the specific surface area by 25 percent and increasing the radius of gyration by about 8 percent, It is concluded that the spot patterns indicating crystalline forms result from strain relief during grinding.

Physical Description

15 p.

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  • Journal Name: Journal of the American Ceramic Society

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  • Report No.: LBL-10224
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1048241
  • Archival Resource Key: ark:/67531/metadc842408

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 1, 1979

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • Oct. 2, 2017, 12:39 p.m.

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Baker, D. F.; Bragg, R. H. & Rao, A. S. Effect of Grinding on the Stucture of Glassy Carbon, article, December 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc842408/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.