Semispiral Structure of Turbostratic Boron Nitride Formed under High Pressure and High Temperature
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概要
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Fine structures appearing in a hexagonal boron nitride (h-BN) under high pressure (7.7 GPa) and high temperature (1800℃) are examined by high-resolution transmission electron microscopy. At the edge of plate-like h-BN crystal sp^2 sheets are strongly bent to form a semispiral structure of t (turbostratic)-BN with an average interplaner spacing of 3.5 Å; edges of h-BN plates are covered by the curved sp^2 sheets so that dangling bonds are minimized. This occurs when the edges of a group of h-BN plates comes up to the planes of another group. The similar structure occurs also inside the crystal near the plate edge. The origin of the semispiral t-BN is discussed from the viewpoint of chemical bonding.
- 1995-12-01
著者
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HORIUCHI Shigeo
National Institute for Research in Inorganic Materials
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AKAISHI Minoru
National Institute for Research in Inorganic Materials
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He Lian-long
National Institute For Research In Inorganic Materials
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Akaishi M
National Institute For Research In Inorganic Materials
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