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Swift Heavy Ion-Induced Decomposition and Phase Transformation in Nanocrystalline SnO2

Published online by Cambridge University Press:  23 July 2014

Alex B. Cusick ,
Maik Lang ,
Fuxiang Zhang ,
Jiaming Zhang ,
Christina Trautmann  and
Rodney C. Ewing
Alex B. Cusick
Affiliation:
Materials Science & Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Maik Lang
Affiliation:
Nuclear Engineering, University of Tennessee, Knoxville, TN 37996, USA
Fuxiang Zhang
Affiliation:
Earth & Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
Jiaming Zhang
Affiliation:
Geological & Environmental Sciences, Stanford University, Stanford, CA 94305, USA
Christina Trautmann
Affiliation:
GSI Helmholtz Center for Heavy Ion Research, D-64291 Darmstadt, Germany
Rodney C. Ewing
Affiliation:
Materials Science & Engineering, University of Michigan, Ann Arbor, MI 48109, USA Earth & Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA Geological & Environmental Sciences, Stanford University, Stanford, CA 94305, USA
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Abstract

A chemical decomposition and related phase transformation have been observed in 2.2 GeV 197Au irradiated SnO2 nanopowder. X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM) were used to characterize the transformation from tetragonal SnO2 (P42/mnm) into tetragonal SnO (P4/nmm). Rietveld refinement of the XRD data determined the structures and proportion of these phases up to a fluence of 2.4×1013 ions/cm2. The initially intense diffraction maxima corresponding to SnO2 gradually decrease in intensity with an increase in fluence. At a fluence of approximately 3.9×1012 ions/cm2, diffraction maxima corresponding to SnO become clearly evident and increase in intensity as fluence increases. Both Raman and TEM analyses confirm the transformation from tetragonal SnO2 to SnO. The XRD refinement results are consistent with a multiple-impact model of transformation, confirmed by TEM as no single tracks were observed. Previous swift heavy ion irradiations of SnO2 have led only to changes in grain size, degrees of crystallinity, and the formation of “holes”. The inconsistency in results is discussed in depth. The proposed mechanism for the currently observed transformation is the interrelation of defect accumulation and thermal-spike mechanisms. The formation of SnO, apparent O loss from the transformation regions, and associated Sn reduction are discussed in terms of thermodynamic, kinetic, and thermal-spike model considerations.

Keywords

phase transformationoxideradiation effects
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1715: Symposium EEE – Materials Behavior under Extreme Irradiation, Stress or Temperature , 2014 , mrss14-1715-eee04-04
Copyright
Copyright © Materials Research Society 2014 

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