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

In this study, 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 Al{sub 2}O{sub 3} 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. 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 Al{sub 2}O{sub 3} 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:
; ;  [1] ; ; ;  [2] ;  [3] ; ;  [4]
  1. Department of Geosciences, Stony Brook University, Stony Brook, New York 11794 (United States)
  2. Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794 (United States)
  3. Department of Earth Sciences, National Cheng Kung University, Tainan 70101, Taiwan (China)
  4. GeoSoilEnviroCARS, Center for Advanced Radiation Sources, The University of Chicago, 5640 S. Ellis Avenue, Chicago, Illinois 60637 (United States)
Publication Date:
OSTI Identifier:
22494742
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM OXIDES; COMPRESSION; CURRENTS; LIQUIDS; MONOCRYSTALS; POLYCRYSTALS; PRESSURE GAGES; PRESSURE RANGE GIGA PA; SILICON OXIDES; SODIUM CHLORIDES; SOLIDS; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; X RADIATION