| People Highlights |
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CDAC high school intern Maneeshika Madduri was a semifinalist in the 2008 Siemens Competition for Math, Science, and Technology with her project on hydrogen complexation studies in crown ethers. Congratulations!
Steven Jacobsen, CDAC Academic Partner from Northwestern (and former Barbara McClintock Postdoctoral Fellow at the Geophysical Laboratory) has been awarded a Packard Fellowship for Science and Engineering. Jacobsen is among 20 scientists selected nationally this year to receive this grant. The funding will support development of Jacobsen’s nano-pulsed GHz-ultrasonic method to study atomic-scale, physical properties of superhard materials targeted for future technological applications
The Carnegie Institution held its annual Summer Scholars Research Symposium on Wednesday, August 6th. The ten students participating in the program this year presented the results of their work for the entire Broad Branch Road campus community. The presentations covered a wide range of topics, including mineral physics, organic geochemistry, astrobiology, petrology, seismology and astronomy.
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Russell Hemley has been elected Honoris Causa Professor for Energetics, Mechanics, Machinery, and Control Systems of the Russian Academy of Sciences (RAS). The academy is the leading scientific body in Russia. Founded in 1724, it is one of the oldest such organizations in the world. The degree is awarded to the most eminent foreign scientists.
CDAC supports graduate student research and training in the area of high pressure materials science, broadly defined. We accept proposals on a continuing basis from faculty interested in joining the CDAC team as academic partners. Student support consists of salary, tuition/fees and some travel to CDAC facilities for experiments. Please send a one-page statement of research interests and plans to Steve Gramsch, CDAC Coordinator. 
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| Meetings & Symposia |
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Workshop on Advances in High-Pressure Science using Synchrotron X-rays NSLS, Brookhaven National Laboratory Upton, NY October 4, 2008 4th Asian Conference on High Pressure Research 4th AHP Seoul, Korea October 14-17, 2008 More Meetings & Symposia |
| Anomalous High-Pressure Behavior of Selenium |
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A collaborative research team from multiple institutions, including Harbin Institute of Technology, Argonne National Laboratory, Harvard University, and Geophysical Laboratory has discovered unexpected dynamics and volume expansion associated with pressure-induced crystallization of amorphous selenium. The development and application of the state-of-the-art high pressure research facilities at multiple beamlines at the Advanced Photon Source during the last two years ensure have made the work possible. The initial appearance of the crystal phase and the transformation between monoclinic and trigonal phases was monitored temporally and spatially, revealing the structural origin of the long-standing enigma of time-dependent electrical properties of the material on compression. The unusual volume expansion phenomenon under pressure associated with the crystallization of an "over-pressurized" metastable phase found in this study may be more common than previously believed.
 The research involved the application of several cutting-edge methods: in situ high pressure synchrotron x-ray diffraction (XRD), novel diamond anvil cell microtomography techniques, as well as first-principles electronic structure calculations. These investigations have revealed the anomalous pressure-induced behavior of amorphous selenium, in particular the direct experimental observation of a volume expansion of a material under high pressure. These results demonstrate the importance of using new time- and spatially- resolved high-pressure XRD and imaging techniques to understand the kinetics of structural transformations in materials under extreme conditions. The new microtomographic technique developed in this project could find widespread use in determinations of the equations of state of glasses and melts up to megabar pressures, which is crucial to many problems in earth, planetary, and materials sciences [Liu, et al., Proc. Nat. Acad. Sci., 105, 13229-13234 (2008)]. |
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