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Article Dans Une Revue Journal of Applied Physics Année : 2022

Anomalous structural phase transformation in swift heavy ion-irradiated δ-Sc4Hf3O12

Résumé

Swift heavy ion irradiation was carried out to examine the ionization effects on structural changes of δ-Sc4Hf3O12 in which oxygen vacancies are regularly arranged. The specimens were irradiated at room temperature with 92 MeV xenon ions to fluences ranging from 3×1012 to 1×1014 /cm2, and characterized by grazing (glancing) incidence x-ray diffraction, transmission electron microscopy, and scanning transmission electron microscopy. It was found that the pristine long-range ordered rhombohedral δ-phase undergoes a reconstructive transformation towards a long-range disordered cubic oxygen-deficient fluorite phase promoted by ionization effects. In addition, an ordered phase with a short-range structure different from the δ-type was formed in a layer going from the surface to a depth of ~4.5 µm in the specimen irradiated to a fluence of 1×1014 /cm2. It was found that the ordered phase is formed from the disordered cubic fluorite phase. This structural change is anomalous, because it is the opposite process of the usual irradiation-induced structural change, the order-to-disorder phase transformation. Electron diffraction experiments revealed that short-range ordered regions in this layer possess an oxygen-excess bixbyite organization (C-type heavy rare-earth oxides) with randomly filled anion vacant sites to account for the different stoichiometry, and a long-range average oxygen-deficient fluorite phase.
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Dates et versions

hal-03744856 , version 1 (03-08-2022)

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Citer

Masanari Iwasaki, Yusuke Kanazawa, Daiki Manago, Maulik Patel, Gianguido Baldinozzi, et al.. Anomalous structural phase transformation in swift heavy ion-irradiated δ-Sc4Hf3O12. Journal of Applied Physics, 2022, 132, pp.075901. ⟨10.1063/5.0098518⟩. ⟨hal-03744856⟩
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