Boron nitrides synthesized directly from the elements at high pressures and temperatures

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We use angle-resolved synchrotron x-ray diffraction, laser sample heating, and diamond-anvil cells to follow in-situ chemical reactions directly between elemental boron and nitrogen. The structures of the solid reaction products vary with pressure. Below 10 GPa, hexagonal BN is the product; cubic or wurzite BN form at higher pressures. Under nitrogen-rich conditions, another hexagonal allotrope occurs which seems to be a new highly transparent, low density h`-BN. No direct reactions occur at ambient temperature even at pressures as high as 50 GPa, implying that a large activation barrier limits the kinetics of these exothermic processes. Laser heating overcomes the large ... continued below

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16 p.

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Nicol, M.; Yoo, C.S.; Akella, J. & Cynn, H. November 1, 1996.

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Description

We use angle-resolved synchrotron x-ray diffraction, laser sample heating, and diamond-anvil cells to follow in-situ chemical reactions directly between elemental boron and nitrogen. The structures of the solid reaction products vary with pressure. Below 10 GPa, hexagonal BN is the product; cubic or wurzite BN form at higher pressures. Under nitrogen-rich conditions, another hexagonal allotrope occurs which seems to be a new highly transparent, low density h`-BN. No direct reactions occur at ambient temperature even at pressures as high as 50 GPa, implying that a large activation barrier limits the kinetics of these exothermic processes. Laser heating overcomes the large kinetic activation barrier and initiates spontaneous, self-sustaining exothermic reactions even at moderate pressures.

Physical Description

16 p.

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INIS; OSTI as DE98050930

Other: FDE: PDF; PL:

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  • International conference on condensed matter under high pressures, Bombay (India), 11-15 Nov 1996

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  • Other: DE98050930
  • Report No.: UCRL-JC--125947
  • Report No.: CONF-9611175--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 301928
  • Archival Resource Key: ark:/67531/metadc676583

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  • November 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • April 10, 2017, 2:01 p.m.

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Nicol, M.; Yoo, C.S.; Akella, J. & Cynn, H. Boron nitrides synthesized directly from the elements at high pressures and temperatures, article, November 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc676583/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.