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Structural stability of Nd2Zr2O7 pyrochlore ion-irradiated in a broad energy range

Abstract : The phase transformations induced by electronic excitation (Se) and ballistic processes (Sn) in Nd2Zr2O7 pyrochlores irradiated with heavy ions in three domains of energy (∼1 GeV, ∼100 MeV and a few MeV) were investigated by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. In the Se regime at high energy, results show that: (i) ion tracks are formed above a Se threshold of 12.5 keV nm−1; (ii) both pyrochlore → anion-deficient fluorite phase transition and amorphization occur; (iii) total amorphization is always observed at the highest fluences; (iv) the internal structure (amount of amorphous phase vs. its anion-deficient fluorite counterpart) and the diameter of tracks depend on many parameters such as Se, the deposited energy density and the recrystallization rate. For irradiations performed with low-energy ions in the Sn regime, only the anion-deficient fluorite phase is formed up to a dose of 40 dpa. Thus Nd2Zr2O7 exhibits an unusual behaviour since this compound is amorphizable by Se and non-amorphizable by Sn. Annealing of totally amorphized Nd2Zr2O7 samples reveals strong differences in the recovery processes with other pyrochlore materials that are related to their different chemical compositions.
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http://hal.in2p3.fr/in2p3-00853989
Contributor : Christine Hadrossek <>
Submitted on : Tuesday, August 27, 2013 - 2:08:17 PM
Last modification on : Saturday, September 19, 2020 - 3:15:53 AM

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G. Sattonnay, N. Sellami, L. Thomé, C. Legros, C. Grygiel, et al.. Structural stability of Nd2Zr2O7 pyrochlore ion-irradiated in a broad energy range. Acta Materialia, Elsevier, 2013, article in press, ⟨10.1016/j.actamat.2013.07.027⟩. ⟨in2p3-00853989⟩

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