Observation of inverted-molecular compression in boron carbide

High-pressure neutron diffraction studies of boron carbide, B[sub 4]C, to 11 GPa show that the icosahedral structural units are 23(4)% more compressible than the structure between them. This inverted-molecular compression is in accordance with qualitative predictions based on models of the bonding,...

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Bibliographic Details
Published in:Physical review letters 1995-03, Vol.74 (12), p.2268-2271
Main Authors: Nelmes, RJ, Loveday, JS, Wilson, RM, Marshall, WG, Besson, JM, Klotz, S, Hamel, G, Aselage, TL, Hull, S
Format: Article
Language:English
Subjects:
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
360203 - Ceramics, Cermets, & Refractories- Mechanical Properties
665100 - Nuclear Techniques in Condensed Matter Physics - (1992-)
BORON CARBIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHEMICAL BONDS
COHERENT SCATTERING
COMPRESSIBILITY
COMPRESSION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH PRESSURE
MATERIALS SCIENCE
MECHANICAL PROPERTIES
NEUTRON DIFFRACTION
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SCATTERING
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Summary:High-pressure neutron diffraction studies of boron carbide, B[sub 4]C, to 11 GPa show that the icosahedral structural units are 23(4)% more compressible than the structure between them. This inverted-molecular compression is in accordance with qualitative predictions based on models of the bonding, but had not previously been observed directly. The results show the effect of the structural compression on the electrical resistivity to be more complex than present, semiquantitative models suggest.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.74.2268