Deutsche Tagung f ¨ur Forschung mit ... - SNI-Portal

Materialien/Werkstoffe Vortrag: Do., 10:20–10:40 D-V33
Phase Transitions in Solids Stimulated by Simultaneous Exposure to High
Pressure and Relativistic Heavy Ions
Ulrich A. Glasmacher 1 , Maik Lang 2 , Hans Keppler 3 , Falko Langenhorst 4 ,
Reinhard Neumann 2 , Dieter Schardt 2 , Christina Trautmann 2 , Günther A.
Wagner 5
1 Geologisch-Paläontologisches Institut, Ruprecht-Karls Universität Heidelberg, Heidelberg,
Germany – 2 Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany
– 3 Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany – 4 Institut für
Geowissenschaften, Friedrich-Schiller-Universität, Jena, Germany – 5 Forschungsstelle
Archäometrie der Heidelberger Akademie der Wissenschaften am Max-Planck-Institut
für Kernphysik, Heidelberg, Germany
In many solids, heavy ions of high kinetic energy (MeV-GeV) produce long cylindrical
damage trails with diameters of order 10 nm (see e. g. [1]). Up to now, almost no
information was available [2] how solids cope with the simultaneous exposure to these
energetic projectiles and to high pressure. We report the first experiments where relativistic
heavy ions from the SIS heavy-ion synchrotron at GSI were injected through
several mm of diamond into solid samples pressurized up to 18 GPa (180 kbar) in a
diamond anvil cell. We used ions with kinetic energies up to 70 GeV which traversed
completely one of the two diamond anvils and penetrated the sample enclosed in the
high-pressure cell with an energy loss value sufficiently high for damage creation [3,4].
In several solids, such as synthetic graphite and natural zircon, the combination of
pressure and ion beams triggered drastic structural changes not caused by the applied
pressure or the ions alone [5]. The modifications comprise long-range amorphization
of graphite rather than individual track formation, and in the case of zircon the decomposition
into nanocrystals and nucleation of the high-pressure phase reidite. In
contrast, for other materials, e. g., dark mica, no significant influence of the pressure
on the ion-track formation could be observed.
[1] Nucl. Instrum. Methods Phys. Res., Sect. B 245 (2006), contain the Proceedings
of the “Sixth International Symposium on Swift Heavy Ions in Matter (SHIM
2005)”.
[2] C. Trautmann, S. Klaumünzer and H. Trinkaus, Phys. Rev. Lett. 85, 36483651
(2000).
[3] M. Lang, U.A Glasmacher, R. Neumann, C. Trautmann, D. Schardt and G.A. Wagner,
Appl. Phys. A 80, 691-694 (2005).
[4] http://www.srim.org/SRIM/SRIM2003.htm
[5] U.A. Glasmacher, M. Lang, H. Keppler, F. Langenhorst, R. Neumann, D. Schardt,
C. Trautmann, G.A. Wagner, Phys. Rev. Lett. (2006), in press.