Frontiers of High-Pressure Research: Next Generation Large Volume Gem Anvil Devices

Details Frontiers of High-Pressure Research: Next Generation Large Volume Gem Anvil Devices Frontiers of High-Pressure Research: Next Generation Large Volume Gem Anvil Devices

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.v32g..03h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #V32G-03

Mathematics

Logic

3994 Instruments And Techniques

Scientific paper

By any measure, the diamond anvil cell has revolutionized static high-pressure research, and in particular experimental study of Earth and planetary deep interiors. Despite the prowess of the technique, however, its range of applicability is in many ways quite limited and its potential not yet fully realized. We have embarked on a program to develop the next generation high-pressure devices that will allow new classes of in situ high P-T measurements critical to understanding the structure, dynamics, and evolution of planetary bodies. A crucial component of this effort is the enlargement of sample volume without sacrificing the unmatched pressure range and versatility of diamond anvil cells. In conventional studies, pressures to several hundred GPa are generated on sample volumes down to the picoliter range. The small sample size is determined by the availability of perfect diamonds as anvils, which are currently of order of 0.2-0.4 up to a few carats. The small sample size has precluded, or greatly limited the accuracy of, certain classes of high pressure experiments. The production of high-quality single-crystal diamond by microwave plasma chemical vapor deposition (CVD) at very high growth rate of 50-150 μ m/h has opened new opportunities for the creation of large perfect single crystal diamond as anvils.1 This morphology, photoluminescence, Raman spectra, and mechanical properties of the CVD diamond have been examined in detail. Of particular interest is our finding of very high strength and improved optical properties of CVD diamond annealed at high pressures and temperatures.2 In addition, hybrid conventional synthetic/CVD single crystals have been successfully used to generate pressures in the multimegabar range (>200 GPa).3 A parallel initiative involves the continued development of moissanite anvils, which can already be produced as large, perfect crystals and can reach pressures above 60 GPa. Recent advances include the design and fabrication of supported moissanite anvils for enhanced sample volumes.4 These developments will make possible new classes of high P-T experiments, including neutron diffraction, inelastic neutron scattering, various inelastic x-ray scattering measurements, magnetic resonance and susceptibility, ultrasonics, and rheological studies in the megabar range. 1 C.S. Yan et al., Proc. Nat. Acad. Sci. 99, 12523 (2002) 2 C.S. Yan et al., to be published. 3 W. Mao et al., to be published. 4 J. Xu et al., to be published.

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