"Nanoscale manipulation of the properties of solids at high pressure with relativistic heavy ions"
Maik Lang, Fuxiang Zhang, Jiaming Zhang, Jianwei Wang, Beatrice Schuster, Christina Trautmann, Reinhard Neumann, U do Becker, Rodney Ewing,
Nature Materials
Vol. 8
2009
793-797
Link
High-pressure and high-temperature phases show unusual physical and chemical properties, but they are often difficult to ‘quench’ to ambient conditions1. Here, we present a new approach, using bombardment with very high-energy, heavy ions accelerated to relativistic velocities, to stabilize a high-pressure phase. In this case, Gd2Zr2O7, pressurized in a diamond-anvil cell up to 40?GPa, was irradiated with 20?GeV xenon or 45?GeV uranium ions, and the (previously unquenchable) cubic high-pressure phase was recovered after release of pressure. Transmission electron microscopy revealed a radiation-induced, nanocrystalline texture. Quantum-mechanical calculations confirm that the surface energy at the nanoscale is the cause of the remarkable stabilization of the high-pressure phase. The combined use of high pressure and high-energy ion irradiation2,3 provides a new means for manipulating and stabilizing new materials to ambient conditions that otherwise could not be recovered.
