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Phase transformations induced by high electronic excitation in ion-irradiated Gd(2)(Zr(x)Ti(1-x))(2)O(7) pyrochlores

Abstract : The pyrochlore oxides (A(2)B(2)O(7)) exhibit a remarkable range of structural, physical, and magnetic properties related to their various chemical compositions. This article reports the phase transformations induced by high electronic excitation in pyrochlores of the Gd(2)(Zr(x)Ti(1-x))(2)O(7) family irradiated with swift ions. The structural changes, investigated by using several analytical techniques (x-ray diffraction, Raman spectroscopy, and transmission electron microscopy), strongly depend on the chemical composition. The high electronic excitation along the ion trajectory results in the amorphization of ion tracks for Gd(2)Ti(2)O(7) and Gd(2)TiZrO(7), whereas a defective fluorite structure is formed in Gd(2)Zr(2)O(7). Moreover, the results underline the existence of an electronic stopping power threshold of 6 keV/nm for amorphizable compounds and 10 keV/nm for Gd(2)Zr(2)O(7), below which phase transformations do not occur. Finally, the study of the thermal recovery of irradiated pyrochlores provides the recrystallization temperature for amorphized samples and reveals differences in the recovery process which are related to the chemical composition. (C) 2010 American Institute of Physics
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Submitted on : Wednesday, February 8, 2012 - 5:18:10 PM
Last modification on : Saturday, July 3, 2021 - 3:39:33 AM

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G. Sattonnay, S. Moll, L. Thome, C. Decorse, C. Legros, et al.. Phase transformations induced by high electronic excitation in ion-irradiated Gd(2)(Zr(x)Ti(1-x))(2)O(7) pyrochlores. Journal of Applied Physics, American Institute of Physics, 2010, 108, pp.103512. ⟨10.1063/1.3503452⟩. ⟨in2p3-00667988⟩

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