STRUCTURAL TRANSFORMATIONS INDUCED AT EXTREME CONDITIONS: COUPLING HIGH-PRESSURE CELLS WITH ENERGETIC ION BEAMS

LANG, Maik¹, ZHANG, Fuxiang², ZHANG, Jiaming³, TRACY, Cameron L.⁴, PALOMARES, Raul I.¹, TRAUTMANN, Christina⁵ and EWING, Rodney C.³, (1)Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996, (2)Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Ann Arbor, MI 48109, (3)Department of Geological Sciences, Stanford University, Stanford, CA 94305-2115, (4)Department of Geological Sciences, Stanford University, Stanford, CA 94305, (5)Technische Universität Darmstadt, Darmstadt, 64287, Germany; GSI Center for Heavy Ion Research, Planckstr. 1, Darmstadt, 64291, Germany, mlang2@utk.edu

Recent advances in the design of diamond anvil cells and techniques for reaching extremely high pressures and temperatures have been combined with irradiations using swift heavy ions. These relativistic ions provide a unique opportunity to access states of matter quite far from thermodynamic equilibrium [1]. Each projectile deposits exceptional amounts of kinetic energy (GeV) within an exceedingly short interaction time (sub-fs) into nanometer-sized volumes of a material, resulting in extremely high energy densities (up to tens of eV/atom). The coupling of extreme energy deposition with high pressures and high temperatures, realized by injecting the relativistic heavy ions through a mm-thick diamond anvil of the pressure cell, dramatically alters transformation pathways and can lead to the formation of new states of matter. This innovative experimental approach allows us to probe the behavior of materials under extreme conditions, to form and stabilize novel phases in a wide range of oxides (e.g., GeO₂ and Gd₂Zr₂O₇) [2], and to manipulate the physical and chemical properties of solids at the nanoscale (e.g., CO₂). A further application is to investigate the effects of radioactive decay events in compressed and heated minerals of Earth’s interior, such as fission-track formation under crustal conditions and phase transitions of damaged minerals (e.g., ZrSiO₄) resulting from meteorite impact [3]. This presentation describes the state-of-the-art science in this field by presenting several examples of structural modifications induced by coupled extreme conditions.

References:

[1] J.M. Zhang, M. Lang, M. Toulemonde, R. Devanathan, R.C. Ewing, W.J. Weber, J. Mater. Res. 25(2010) 1344.

[2] M. Lang, F.X. Zhang, J.M. Zhang, J.W. Wang, B. Schuster, C. Trautmann, R. Neumann, U. Becker, R.C. Ewing, Nature Materials 8(2009) 793.

[3] M. Lang, F.X. Zhang, J. Lian, C. Trautmann, R. Neumann, R.C. Ewing, J. Synchrotron Radaition 6 (2009) 773.

Session No. 65

T134. Radiation Effects, Mineralogy, and Materials Science of Actinides II: In Honor of Rodney C. Ewing, 2015 Roebling Medalist

Sunday, 1 November 2015: 1:30 PM-5:30 PM

Room 317 (Baltimore Convention Center)

Geological Society of America Abstracts with Programs. Vol. 47, No. 7, p.202

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2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

STRUCTURAL TRANSFORMATIONS INDUCED AT EXTREME CONDITIONS: COUPLING HIGH-PRESSURE CELLS WITH ENERGETIC ION BEAMS