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The bound exciton recombination properties in freestanding GaN layers of various thicknesses grown by halide vapor phase epitaxy have been characterized by time-resolved spectroscopy. Improvement of t...
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Cellular solids with tunable positive or negative thermal expansion of unbounded magnitude

Appl. Phys. Lett. 90, 221905 (2007); doi:10.1063/1.2743951

Published 29 May 2007

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Roderic Lakes
Engineering Mechanics Program, Department of Engineering Physics, University of Wisconsin-Madison; Materials Science Program, Biomedical Engineering Department, University of Wisconsin-Madison; and Rheology Research Center, Biomedical Engineering Department, University of Wisconsin-Madison, 541 Engineering Research Building, 1500 Engineering Drive, Madison, Wisconsin 53706-1687
Material microstructures are presented with a coefficient of thermal expansion larger in magnitude than that of either constituent. Thermal expansion can be large positive, zero, or large negative. Three-dimensional lattices with void space exceed two-phase bounds but obey three-phase bounds; lattices and normal materials have a trend of expansion decreasing with modulus. Two-phase composites with a negative stiffness phase exceed bounds that assume positive strain energy density. The author determined Young's modulus and its relation to thermal expansion. Behavior of these composites is compared with that of homogeneous solids in expansion-modulus maps. ©2007 American Institute of Physics
History: Received 14 March 2007; accepted 5 May 2007; published 29 May 2007
Permalink: http://link.aip.org/link/?APPLAB/90/221905/1
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KEYWORDS and PACS

Keywords
PACS
  • 65.40.De
    Thermal expansion; thermomechanical effects (crystalline solids)
  • 81.40.Jj
    Elasticity and anelasticity, stress-strain relations
  • 62.20.Dc
    Elasticity, elastic constants
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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