Title: Acoustic travel time gauges for in-situ determination of pressure and temperature in multi-anvil apparatus

Abstract

In this work, we developed a new method for in-situ pressure determination in multi-anvil, high pressure apparatus using an acoustic travel time approach within the framework of acoustoelasticity. The ultrasonic travel times of polycrystalline Al₂O₃ were calibrated against NaCl pressure scale up to 15 GPa and 900°C in a Kawai-type double-stage multi-anvil apparatus in conjunction with synchrotron X-radiation, thereby providing a convenient and reliable gauge for pressure determination at ambient and high temperatures. The pressures derived from this new travel time method are in excellent agreement with those from the fixed-point methods. Application of this new pressure gauge in an offline experiment revealed a remarkable agreement of the densities of coesite with those from the previous single crystal compression studies under hydrostatic conditions, thus providing strong validation for the current travel time pressure scale. Additionally, the travel time approach not only can be used for continuous in-situ pressure determination at room temperature, high temperatures, during compression and decompression, but also bears a unique capability that none of the previous scales can deliver, i.e., simultaneous pressure and temperature determination with a high accuracy (+-0.16 GPa in pressure and +-17°C in temperature). Therefore, the new in-situ Al₂O₃ pressure gauge is expected tomore » enable new and expanded opportunities for offline laboratory studies of solid and liquid materials under high pressure and high temperature in multi-anvil apparatus.« less

Authors:

Wang, Xuebing ^[1]; Chen, Ting ^[1]; Qi, Xintong ^[1]; Zou, Yongtao ^[2]; Kung, Jennifer ^[3]; Yu, Tony  ^[4];

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Wang, Yanbin ^[4]; Liebermann, Robert C. ^[2]; Li, Baosheng ^[2]

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+ Show Author Affiliations

1. Stony Brook Univ., NY (United States). Department of Geosciences
2. Stony Brook Univ., NY (United States). Mineral Physics Institute
3. National Cheng Kung University, Tainan (Taiwan). Department of Earth Sciences
4. Univ. of Chicago, IL (United States). GeoSoilEnviroCARS, Center for Advanced Radiation Sources

Publication Date:

Mon Aug 10 00:00:00 EDT 2015

Research Org.:

Stony Brook Univ., NY (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

OSTI Identifier:

1466799

Alternate Identifier(s):

OSTI ID: 1229604

Grant/Contract Number:  

NA0001815; FG02-94ER14466; AC02-06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Applied Physics

Additional Journal Information:

Journal Volume: 118; Journal Issue: 6; Journal ID: ISSN 0021-8979

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; pressure calibration; multi-anvil apparatus; acoustic method