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Title: A New Multiphase Equation of State for SiO 2

Abstract

SiO 2 is found as α-quartz at ambient conditions. Under shock compression, it transforms into a much higher density stishovite-like phase around 20 GPa, then into a liquid phase above 100 GPa. The SESAME library contains older equations of state for α-quartz, polycrystalline quartz, and fused quartz. These equations of state model the material as a single phase; i.e., there is no high pressure phase transition. Somewhat more recently (in 1992), Jon Boettger published equations of state for α-quartz, coesite, and stishovite, along with a phase transition model to mix them. However, we do not have a multiphase EOS that captures the phase transitions in this material. Others are working on a high-accuracy model for very high pressure SiO 2, since liquid quartz is used as an impedance matching standard above 100 GPa; however, we are focused on the 10-50 GPa range. This intermediate pressure range is most relevant for modeling the decomposition products of silicone polymers such as Sylgard 184 and SX358.

Authors:
 [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1398902
Report Number(s):
LA-UR-17-29182
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Maerzke, Katie A., and Gammel, J. Tinka. A New Multiphase Equation of State for SiO2. United States: N. p., 2017. Web. doi:10.2172/1398902.
Maerzke, Katie A., & Gammel, J. Tinka. A New Multiphase Equation of State for SiO2. United States. https://doi.org/10.2172/1398902
Maerzke, Katie A., and Gammel, J. Tinka. Fri . "A New Multiphase Equation of State for SiO2". United States. https://doi.org/10.2172/1398902. https://www.osti.gov/servlets/purl/1398902.
@article{osti_1398902,
title = {A New Multiphase Equation of State for SiO2},
author = {Maerzke, Katie A. and Gammel, J. Tinka},
abstractNote = {SiO2 is found as α-quartz at ambient conditions. Under shock compression, it transforms into a much higher density stishovite-like phase around 20 GPa, then into a liquid phase above 100 GPa. The SESAME library contains older equations of state for α-quartz, polycrystalline quartz, and fused quartz. These equations of state model the material as a single phase; i.e., there is no high pressure phase transition. Somewhat more recently (in 1992), Jon Boettger published equations of state for α-quartz, coesite, and stishovite, along with a phase transition model to mix them. However, we do not have a multiphase EOS that captures the phase transitions in this material. Others are working on a high-accuracy model for very high pressure SiO2, since liquid quartz is used as an impedance matching standard above 100 GPa; however, we are focused on the 10-50 GPa range. This intermediate pressure range is most relevant for modeling the decomposition products of silicone polymers such as Sylgard 184 and SX358.},
doi = {10.2172/1398902},
url = {https://www.osti.gov/biblio/1398902}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {10}
}