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A New Monoclinic Structure for “Compressed Hexagonal Boron Nitride”

Published online by Cambridge University Press:  10 February 2011

S. Horiuchi ,
L. L. He  and
M. Akaishi
S. Horiuchi
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki, 305, Japan
L. L. He
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Schenyang 110015, P.R.China
M. Akaishi
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1–1, Tsukuba, Ibaraki, 305, Japan
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Abstract

A prominent contraction of the interplanar spacing between sp2 sheets from 3.33 to 3. 10Å in so-called “compressed h-BN”, which appears on the phase transition from h(hexagonal)- to c(cubic)-boron nitride (BN) under high pressure (7.7GPa) at high temperature (1800°C), is examined by high-resolution transmission electron microsco)py (HRTEM). It is attributable to a monoclinic lattice distortion of the residual h-BN, which originates from the difference in the compressibility as well as the thermal expansion between adjoining h- and c-BN grains. The parameters of the monoclinic unit-cell are am=4.33, bm=2.50, cm,=3.1–3.3Å and β=92 - 95°. Thin plates of h-BN are often folded and the folding also causes the monoclinic structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 410: Symposium S – Covalent Ceramics III-Science and Technology of Non-Oxides , 1995 , 253
Copyright
Copyright © Materials Research Society 1996

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References

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