Electronic mechanism of hardness enhancement in transition-metal carbonitrides
Article Abstract:
The behaviour of transition-metal carbides and nitrides can be understood on a basic level in terms of their electronic band structure. Research in this area has focused on C44, which by itself represents a shape change without volume change and gives an insight into electronic response to shear strain. The ratio of the hardness to the calculated C44 shows that the yield stress or the critical shear stress of the alloys is near to the theoretical value of the perfect crystals, which is often the case with covalently bonded materials.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Three-dimensional fluctuation conductivity in superconducting single crystal K3C60 and Rb3C60
Article Abstract:
Three-dimensional paraconductivity has been observed in single crystals of the superconductors K3C60 and Rb3C60. Paraconductivity results from temperature fluctuations of a material near its superconducting transition temperature. As with the analogous Curie-Weiss transition in ferromagnets, measures of paraconductivity allow a stringent test of scaling theories. Furthermore, a measure of paraconductivity allows indirect calculation of residual normal-state conductivity.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Half-metallic graphene nanoribbons
Article Abstract:
First-principles calculations were used to predict half-metallicity in nanometre-scale graphene ribbons. The results reveal that if in-plane homogeneous electric fields are applied across the zigzag-shaped edges of the graphene nanoribbons their magnetic properties could be controlled by the external electric fields.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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