Studies on Materials Under Ultrahigh P-T at the Advanced Photon Source

Abstract

The Advanced Photon Source (APS) is a third-generation synchrotron now in operation at Ar-gonne National Laboratory. A national user facility for research in the Earth sciences is being constructed by the GeoSoilEnviro group of the Consortium for Advanced Radiation Sources (GSECARS). One component of this effort is the program for diamond anvil cell (DAC) research, to study materials at ultrahigh pressure and temperature conditions using a variety of techniques.In this paper, we describe the DAC facility that is being developed at the GSECARS. Recent progress in developing a laser heating system is presented.

Pressure-induced transformations of cristobalite

“…We conducted in situ X-ray high-pressure and high-temperature experiments at Uppsala Lab, ESRF (beam line ID30), APS (Argonne National Lab, GSECARS, Sector 13), and at BNL (beam line X-17C) using electrical and laser heating methods with white and constant wavelength radiation, energy and angle sensitive detectors [12,14,15]. In our analysis of the integrated X-ray spectra, we used the program GSAS [16] and PeakFit 4.0.…”

“…At APS, we used the double sided laser heating technique with heating spot of 20±40 lm. For temperature measurement, Kaiser holographic spectrometers together with the CCD were used [15]. Cristobalite samples were obtained by heating silica gel (99.99% purity) at 1550°C for 8 h and then quenching it.…”