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10 MeV Au ion irradiation effects in an MgO–HfO2 ceramic–ceramic (CERCER) composite by J.A. Valdez; I.O. Usov; J. Won; M. Tang; R.M. Dickerson; G.D. Jarvinen; K.E. Sickafus is a Materials Science article available to read on EtoBox.

What is 10 MeV Au ion irradiation effects in an MgO–HfO2 ceramic–ceramic (CERCER) composite about?

Room temperature ion irradiation damage studies were performed on a ceramic composite intended to emulate a dispersion nuclear fuel. The composite is composed of 90-mole% MgO and 10-mole% HfO 2 . The as-synthesized composite was found to consist of Mg 2 Hf 5 O 12 (and some residual HfO 2 ) particles embedded in an MgO matrix. X-ray diffraction revealed that nearly all of the initial HfO 2 reacted with some MgO to form Mg 2 Hf 5 O 12 . Ion irradiations were performed using 10 MeV Au 3+ ions at room temperature over a fluence range of 5 Â 10 16 -5 Â 10 20 Au/m 2 . Irradiated samples were characterized using both grazing incidence X-ray diffraction (GIXRD) and transmission electron microscopy (TEM), the latter using both selected-area electron diffraction (SAED) and micro-diffraction (lD) on samples prepared in cross-sectional geometry. Both GIXRD and TEM electron diffraction measurements on a specimen irradiated to a fluence of 5 Â 10 20 Au/cm 2 , revealed that the initial rhombohedral Mg 2 Hf 5 O 12 phase was transformed into a cubic-Mg 2 Hf 5 O 12 phase. Finally, it is important to note that at the highest ion fluence used in this investigation (5 Â 10 20 Au/m 2 ), both the MgO mat

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Author

J.A. Valdez; I.O. Usov; J. Won; M. Tang; R.M. Dickerson; G.D. Jarvinen; K.E. Sickafus

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-3115)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)