Abstract
A Paris-Edinburgh press combined with a multi-channel collimator assembly has been commissioned at the GeoSoilEnviro Center for Advanced Radiation Sources (GSECARS) beamline for monochromatic X-ray scattering, with an emphasis on studying low-Z liquids, especially silicate liquids at high pressure. The Paris-Edinburgh press is mounted on a general-purpose diffractometer, with a pixel array detector mounted on the detector arm. The incident monochromatic undulator beam with energies up to 60 keV is focused both horizontally and vertically to a beam size about 30 × 30 µm. With this setup, background scattering from the surrounding pressure media is completely removed at 2θ angles above 10° for samples larger than 1.05 mm in diameter. Thirty minutes is typically sufficient to collect robust X-ray scattering signals from a 1.6 mm diameter amorphous silicate sample. Cell assemblies for the standard Paris-Edinburgh anvils have been developed and pressures and temperatures up to 7 GPa and 2300 K, respectively, have been maintained steadily over hours. We have also developed a cupped-toroidal Drickamer anvil to further increase pressure and temperature capabilities. The cupped-toroidal Drickamer anvil combines features of a modified Drickamer anvil and the traditional Paris-Edinburgh anvil. Pressures up to 12 GPa have been generated at temperatures up to 2100 K.
Highlights
Studying atomic-scale structures of silicate liquids can help us improve our understanding of the properties of magmas under pressure
We report our recent development at the GeoSoilEnviro Center for Advanced Radiation Sources (GSECARS)
X-ray diffraction (EDXD) method, commonly used to minimize unwanted X-ray scattering signal from surrounding pressure media in large-volume multi-anvil experiments, our multi-channel collimator combined with angle-dispersive X-ray diffraction (ADXD) measurements are performed at fixed energy and undulator gap, eliminating the need for energy dependent absorption and the undulator spectrum corrections to the data as well as allowing us to take full advantage of the brilliance of the Advanced Photon Source synchrotron light source
Summary
Tony Yu 1, * , Clemens Prescher 1,† , Young Jay Ryu 1 , Feng Shi 1,‡ , Eran Greenberg 1,§ , Vitali Prakapenka 1 , Peter Eng 1 , Joanne Stubbs 1 , Yoshio Kono 2,k , Guoyin Shen 3 , Heather Watson 4 , Mark L. At the Institute of Geology and Mineralogy, University of Cologne, Albertus-Magnus-Platz, 50674 Cologne, Germany. At the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences-Wuhan, Wuhan 430074, China. At the Applied Physics Department, Soreq Nuclear Research Center (NRC), Yavne 81800, Israel. At the Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan. Received: 16 October 2019; Accepted: 14 November 2019; Published: 19 November 2019
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