Elastic, anelastic, and piezoelectric coefficients of GaN

Nakamura, N.; Ogi, H.; Hirao, M.

doi:doi:10.1063/1.3674271

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Shock-induced consolidation and spallation of Cu nanopowders

A useful synthesis technique, shock synthesis of bulk nanomaterials from nanopowders, is explored here with molecular dynamics simulations. We choose nanoporous Cu (∼11 nm in grain size and 6% porosity) as a representative system, and perform consolidation and spallation simulations. The spallation simulations characterize the consolidated nanopowders in terms of spall strength and damage mechanisms. The impactor is full density Cu, and the impact velocity (ui) ranges from 0.2 to 2 km s−1. We p...

On the effective thermoelectric properties of layered heterogeneous medium

The effective thermoelectric behavior of layered heterogeneous medium is studied, with the distribution of temperature, electric potential, and heat flux solved rigorously from the governing equations, and the effective thermoelectric properties defined through an equivalency principle. It is discovered that the effective thermoelectric figure of merit of a composite medium can be higher than all of its constituents even in the absence of size and interface effects, in contrast to previous stud...

We report elastic, anelastic, and piezoelectric coefficients of wurtzite GaN measured by resonant-ultrasound spectroscopy coupled with laser-Doppler interferometry. Five rectangular parallelepiped specimens, measuring 6.5 × 2.0 × 4.0 mm³, cut from two single crystals were used. Our values of elastic and piezoelectric coefficients were C₁₁ = 359.4 GPa, C₁₂ = 129.2 GPa, C₁₃ = 92.0 GPa, C₃₃ = 389.9 GPa, C₄₄ = 98.0 GPa, e₁₅ = 0.10 C/m², e₃₁ = 0.17 C/m², and e₃₃ = 0.29 C/m². In anelastic coefficients, anisotropy was observed between Q₁₁⁻¹ and Q₃₃⁻¹.

Article Outline

INTRODUCTION
EXPERIMENTAL DETAILS
RESULTS AND DISCUSSION
CONCLUSIONS

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KEYWORDS and PACS

Keywords

anelasticity, elasticity, gallium compounds, III-V semiconductors, interferometry, piezoelectricity, wide band gap semiconductors

PACS

81.40.Jj

Elasticity and anelasticity, stress-strain relations
62.40.+i

Anelasticity, internal friction, stress relaxation, and mechanical resonances
77.84.Bw

Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
77.65.Bn

Piezoelectric and electrostrictive constants
62.20.dq

Other elastic constants

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3674271

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

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