Journal ArticleDOI
The isothermal compression of Al2O3 at 295 °K up to 1 megabar
TLDR
In this paper, the isothermal p-V relation for Al2O3 at 295 °K was established by using a polynomial quadratic in p to represent the bulk modulus, BT, as a function of pressure.Abstract:
The isothermal p-V relation for Al2O3 at 295 °K is established by using a polynomial quadratic in p to represent the isothermal bulk modulus, BT, as a function of pressure. The second order derivative of BT with respect to pressure at p=0 is evaluated from available ultrasonic data. Comparison between experimental compression measurements and the present calculated results shows excellent agreement up to at least 1 megabar. It also shows that there seems to exist a phase transition in the neighborhood of 1.3 megabars.read more
Citations
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Journal ArticleDOI
Pressure dependence of single‐crystal elastic constants and anharmonic properties of spinel
Z. P. Chang,G. R. Barsch +1 more
TL;DR: In this paper, the authors measured the pressure dependence of the single-crystal elastic constants of synthetic stoichiometric spinel (MgAl2O4) using the ultrasonic pulse superposition method.
Journal ArticleDOI
Dynamic Yield Strengths of B4C, BeO, and Al2O3 Ceramics
W. H. Gust,E. B. Royce +1 more
TL;DR: In this article, the authors measured the dynamic yield strength for several ceramics under shock-wave compression and found that the elastic limit of the elastic precursor traveling ahead of the compressional wave was 154 and 82 kbar for B4C and BeO, respectively.
Journal ArticleDOI
Pressure dependence of the elastic constants of RbCl, RbBr and RbI
Z.P. Chang,G.R. Barsch +1 more
TL;DR: In this article, the single crystal elastic constants of RbCl, RbBr and RbI at 25°C were measured by using the ultrasonic pulse superposition technique up to pressures of 45, 37 and 3 kbar, respectively.
Journal ArticleDOI
Polymorphs of Alumina Predicted by First Principles: Putting Pressure on the Ruby Pressure Scale
TL;DR: It is therefore possible that the ruby (Cr3+-doped corundum) fluorescence pressure scale is sensitive to the thermal history of the ruby chips in a given experiment.
Journal ArticleDOI
Semiclassical approach for isothermal densification of a solid body driven by diffusion-like mechanisms
TL;DR: In this paper, a semiclassical theory is proposed to investigate the pressureless densification of a solid body governed by diffusion phenomena at constant temperature, where the Debye approximation for the Helmholtz free energy has been provided with a density of vibrational modes that accounts for the microstructural changes occurring at the frequency scale of the implied matter transport.
References
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The use of ultrasonic measurements under modest pressure to estimate compression at high pressure
TL;DR: In this article, a formula for the compression is presented which is based upon the assumption that the bulk modulus is linear with pressure, and the parameters of this formula are evaluated with acoustic data so that there are no arbitrary constants or curve-fitting.
Journal ArticleDOI
Variation of Elastic Constants and Static Strains with Hydrostatic Pressure: A Method for Calculation from Ultrasonic Measurements
TL;DR: In this paper, the elastic constants and static strains of a solid subjected to large hydrostatic pressures can be deduced from measurements of resonant frequencies (or transit times) for ultrasonic waves in specimens of suitable crystallographic orientations.
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