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Microstructure of Swift Heavyion Irradiated MgAl204 Spinel

Published online by Cambridge University Press:  15 February 2011

S.J. Zinkle ,
Hj. Matzke  and
V.A. Skuratov
S.J. Zinkle
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6376USA, [email protected]
Hj. Matzke
Affiliation:
EC, JRC, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany
V.A. Skuratov
Affiliation:
Joint Institute for Nuclear Research, Flerov Lab, 141980 Dubna, Russia
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Abstract

Plan view and cross-section transmission electron microscopy was used to investigate the microstructure of magnesium aluminate spinel (MgAl2O4) following room temperature irradiation with either 430 MeV Kr, 614 MeV Xe, or 72 MeV I ions. The fluences ranged from 1×1016/m2 (single track regime) to 1×1020/m2. Destruction of the ordered spinel crystal structure on both the anion and cation sublattices was observed in the ion tracks at low fluences. At intermediate fluences, the overlapping ion tracks induced the formation of a new metastable crystalline phase. Amorphization with a volumetric expansion of ∼35% was observed in spinel irradiated with swift heavy ions (electronic stopping powers >7 keV/nm) at fluences above 1×1019/m2. These results demonstrate that swift heavy ion radiation can induce microstructural changes not achievable with conventional elastic collision irradiation at comparable temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 540: Symposium N / Microstructural Processes in Irradiated Materials , 1998 , 299
Copyright
Copyright © Materials Research Society 1999

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