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C60 and U ion irradiation of Gd2TixZr2−xO7 pyrochlore

Published online by Cambridge University Press:  28 August 2015

Jiaming Zhang ,
Marcel Toulemonde ,
Maik Lang ,
Jean Marc Costantini ,
Serge Della-Negra  and
Rodney C. Ewing
Jiaming Zhang
Affiliation:
Department of Geological Sciences, School of Earth Science, Stanford University, Stanford, California 94305, USA
Marcel Toulemonde
Affiliation:
Centre interdisciplinaire de recherche sur les Ions, les Matériaux et la Photonique (CIMAP), CEA-CNRS-ENSICAEN-University of Caen, 14070 Caen, France
Maik Lang
Affiliation:
Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
Jean Marc Costantini
Affiliation:
CEA, DEN, SRMA, F-11191 Gif-sur-Yvette Cedex, France
Serge Della-Negra
Affiliation:
Institut de Physique Nucléaire, CNRS-IN2P3, 91406 Orsay, France
Rodney C. Ewing*
Affiliation:
Department of Geological Sciences, School of Earth Science, Stanford University, Stanford, California 94305, USA
*
a)Address all correspondence to this author. e-mail: rewing1@stanford.edu
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Abstract

Gd2TixZr2−xO7 (x = 0 to 2) pyrochlore was irradiated by 30 MeV C60 clusters, which provide an extremely high ionizing energy density. High-resolution transmission electron microscopy revealed a complex ion-track structure in Gd2Ti2O7 and Gd2TiZrO7, consisting of an amorphous core and a shell of a disordered, defect-fluorite structure. As compared with the irradiation by 1.5 GeV U ions with the highest energy loss, the track structure is consistent with tracks created by monoatomic swift heavy ions, but the diameters (with the entire diameter of 17 nm for Gd2Ti2O7 and 15 nm for Gd2TiZrO7) are significantly larger due to the much smaller velocity and higher energy density of the C60 ions. Ion tracks created by monoatomic ions are challenging to describe by HRTEM, as the boundary between disordered fluorite and pyrochlore matrix is less distinct. However, the C60 irradiation shows a clearly resolved ion track with completely crystalline, disordered, defect-fluorite structure around an amorphous core. Based on the distinct boundaries of the track morphology, inelastic thermal-spike calculations were used to describe the track size and extract critical energy densities for the interpretation of the complex core–shell morphologies for the different pyrochlore compositions.

Keywords

radiation effectstransmission electron microscopy (TEM)oxide
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 16 , 28 August 2015 , pp. 2456 - 2466
Copyright
Copyright © Materials Research Society 2015 

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