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Title: Dynamic Loading of Z-cut Sapphire and Coors AD995 Alumina Shocked to 100 GPa - a Comparison.

Abstract

Abstract not provided.

Authors:
;  [1]
  1. Sandia National Laboratories, Albuquerque, NM
Publication Date:
Research Org.:
Sandia National Laboratories Albuquerque, NM; Sandia National Laboratories
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1148486
Report Number(s):
SAND2007-2261J
523409
DOE Contract Number:
DE-AC04-94AL85000
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Plasticity; Related Information: Proposed for publication in International Journal of Plasticity.
Country of Publication:
United States
Language:
English

Citation Formats

Chhabildas, Lalit C, and Reinhart, William D. Dynamic Loading of Z-cut Sapphire and Coors AD995 Alumina Shocked to 100 GPa - a Comparison.. United States: N. p., 2007. Web.
Chhabildas, Lalit C, & Reinhart, William D. Dynamic Loading of Z-cut Sapphire and Coors AD995 Alumina Shocked to 100 GPa - a Comparison.. United States.
Chhabildas, Lalit C, and Reinhart, William D. Sun . "Dynamic Loading of Z-cut Sapphire and Coors AD995 Alumina Shocked to 100 GPa - a Comparison.". United States. doi:.
@article{osti_1148486,
title = {Dynamic Loading of Z-cut Sapphire and Coors AD995 Alumina Shocked to 100 GPa - a Comparison.},
author = {Chhabildas, Lalit C and Reinhart, William D.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {International Journal of Plasticity},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}
  • No abstract prepared.
  • Most of the chemical elements have now been compressed close to or above 100 GPa (1 Mbar) pressure in diamond-anvil cells and the pressure–volume room-temperature isotherms have been measured. We collect these data and use simple lattice-dynamics models to reduce the isotherms to 0 K. We have extended the published work by making new diamond-anvil-cell measurements on Cr and Rh, and by conducting density-functional calculations on the elements Po, At, Rn, Fr, Ra, and Ac. The 0 K data are tabulated for all elements 1 ≤ Z ≤ 92 and 0 ≤ P ≤ 100 GPa. These data are usefulmore » for generating wide-range equation of state models and for studying the stability of chemical compounds at high pressure (“Megabar chemistry”). As a result, the tables presented here are intended to be reference thermodynamic tables for use in high-pressure research. Further experimental and theoretical work will be needed to extend the tables to higher pressure and to improve accuracy.« less
  • High-pressure refractive index of optical window materials not only can provide information on electronic polarizability and band-gap structure, but also is important for velocity correction in particle-velocity measurement with laser interferometers. In this work, the refractive index of r-cut sapphire window at 1550 nm wavelength was measured under shock pressures of 5–65 GPa. The refractive index (n) decreases linearly with increasing shock density (ρ) for shock stress above the Hugoniot elastic limit (HEL): n = 2.0485 (± 0.0197) − 0.0729 (± 0.0043)ρ, while n remains nearly a constant for elastic shocks. This behavior is attributed to the transition from elastic (below HEL) to heterogeneous plastic deformationmore » (above HEL). Based on the obtained refractive index-density relationship, polarizability of the shocked sapphire was also obtained.« less
  • Dynamic equation-of-state data for liquid H/sub 2/O and NH/sub 3/ were measured in the shock pressure range 30--230 GPa (0.3--2.3 Mbar) using a two-stage light-gas gun. Electrical conductivities of water were also measured in the shock pressure range 28--59 GPa (280--590 kbar). The experimental techniques to measure the electrical conductivity in a 50 ns time interval and to cool the target holders to liquid ammonia temperatures (230 K) are described. The H/sub 2/O data are discussed in terms of the statistical mechanics model of Ree. At temperatures above 3000 K significant molecular ionization occurs.
  • Shock wave experiments were performed to characterize z-cut, {alpha}-quartz as an optical window for velocity interferometry measurements. Refractive index changes and shock velocities were determined to 60 kbar peak stress. Results indicate that the window correction to velocity measurements is a constant fraction of the actual particle velocity, {Delta}u/u=0.08107. Shock velocity measurements provide the Hugoniot curve to 60 kbar, and yield the fourth-order elastic constant, C{sub 3333}=174810kbar. By combining the velocity correction factor and the shock velocity measurements, the refractive index is determined to be a linear function of density. This finding is used to show that the velocity correctionmore » appropriate for a step jump may be applied to monotonically time-dependent wave forms with negligible error. The present work has demonstrated the use of z-cut quartz as an optical window to 60 kbar.« less