5. Optical spectroscopy for materials science and mineralogy

We have carried out high-pressure Raman and (synchrotron-based) infrared spectroscopic studies on a number of materials in recent years. These include IR studies of phases D and E which are dense hydrous magnesium silicates. Phase E may be an important water carrier in subducting slabs and phase D may be a host for hydrogen in the Earth’s lower mantle. In one recent Raman study, we examined the behavior of MgGeO3 perovskite and post-perovskite to pressures above 1 Mbar. Our collaborators in these projects include S. Shieh (U. Western Ontario) and D. Shim (MIT).

Selected References:
Shieh, S. R., T. S. Duffy, Z. Liu, and E. Ohtani, High-pressure infrared spectroscopy of the hydrous magnesium silicates, phase D and phase E, Physics of the Earth and Planetary Interiors, 175, 106-114, 2009.

Raitses, Y., C. H. Skinner, F. Jiang, and T. S. Duffy, Raman spectroscopy of carbon dust samples from NSTX, Journal of Nuclear Materials, 375, 365-369, 2008.

Shim, S.-H., A. Kubo, and T. S. Duffy, Raman spectroscopy of perovskite and post-perovskite phases of MgGeO­3 to 123 GPa, Earth and Planetary Science Letters, 260, 166-178, 2007.

Yin, H. Z., K. D. Hobart, F. J. Kub, S. R. Shieh, T. S. Duffy, J. C. Sturm, High-Ge-content SiGe islands formed on compliant oxide by SiGe oxidation, Applied Physics Letters, 84, 3624-3626, 2004.

Duffy Group
High-Pressure Mineral Physics and Materials Science Laboratory
Department of Geosciences
Princeton University