Structural stability of Nd2Zr2O7 pyrochlore ion-irradiated in a broad energy range - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Acta Materialia Year : 2013

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.

Dates and versions

in2p3-00853989 , version 1 (27-08-2013)

Identifiers

Cite

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, 2013, article in press, ⟨10.1016/j.actamat.2013.07.027⟩. ⟨in2p3-00853989⟩
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