Ion irradiation induced order-to-disorder transformations in δ-phase Sc4−xZr3+xO12+x/2

Zhang, J.; Wang, Y.Q.; Tang, Ming; Valdez, James A.; Sickafus, Kurt E.

doi:10.1016/j.nimb.2010.05.031

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…Each O layer is analogous to a 6/7 dense (partially-dense) 3 4 Á6 Archimedean tiling compared to a 7/7 (fully-dense) triangular atom net M layer. Several previous studies concluded that the order-to-disorder phase transformation of d-phase compound is attributed to the effects of anion oxygen Frenkel-pair defects [16,19,[27][28][29]. It is reasonable to assume that the order-to-disorder phase transformation in d-Sc 4 Hf 3 O 12 is also due to anion oxygen Frenkel-pair defect.…”

Section: Discussionmentioning

confidence: 97%

Heavy and light ion irradiation damage effects in δ-phase Sc4Hf3O12

Wen

Tang

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c tPolycrystalline d-phase Sc 4 Hf 3 O 12 was irradiated with light and heavy ions to study the radiation stability of this compound. In order to explore the ion species spectrum effect, the irradiations were performed with 400 keV Ne 2+ ions to fluences ranging from 1 Â 10 14 to 1 Â 10 15 ions/cm 2 , 600 keV Kr 3+ ions to fluences ranging from 5 Â 10 14 to 5 Â 10 15 ions/cm 2 , and 6 MeV Xe 26+ ions to fluences ranging from 2 Â 10 13 to 1 Â 10 15 ions/cm 2 . Irradiated samples were characterized by various techniques including grazing incidence X-ray diffraction (GIXRD) and transmission electron microscopy (TEM). A complete phase transformation from ordered rhombohedral to disordered fluorite was observed by a fluence of 1 Â 10 15 ions/cm 2 with 400 keV Ne 2+ ions, equivalent to a peak ballistic damage dose of $0.33 displacements per atom (dpa). Meanwhile, the same transformation was also observed by 600 keV Kr 3+ ions at the same fluence of 1 Â 10 15 ions/cm 2 , which however corresponds to a peak ballistic damage dose of $2.2 dpa. Only a partial O-D transformation was observed for 6 MeV Xe 26+ ions in the fluence range used. Experimental results indicated that the O-D transformation is observed under both electronic and nuclear stopping dominant irradiation regimes. It was also observed that light ions are more efficient than heavy ions in producing the retained defects that are presumably responsible for the O-D phase transformation. The O-D transformation mechanism is discussed in the context of anion oxygen Frenkel defects and cation antisite defects. We concluded that the irradiation induced O-D transformation is easier to occur in d-phase compounds with partial order of cations than in that with fully disordered cation structures.

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Section: Discussionmentioning

confidence: 97%

Heavy and light ion irradiation damage effects in δ-phase Sc4Hf3O12

Wen

Tang

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…The fluorite structure (CaF 2 type, Fm3m _ ), consisting of a face-centered cubic array of cations in all of the tetrahedral interstices is adopted by MO 2 dioxides (M represents a metal ion, while O refers to oxygen anion). Certain oxygen-deficient fluorite structural derivatives (MO 2-x ), such as pyrochlore (M 4 O 7 ) compounds (more specifically A 3+ 2 B 4+ 2 O 7 ) [2][3][4][5][6], α-bixbytie (M 2 O 3 ) compounds [7,8], and δ-phase (M 7 O 12 ) compounds (more specifically A 3+ 4 B 4+ 3 O 12 ) [9,10], exhibit amorphization resistance upon ion irradiation to very high radiation fluence.…”

Section: Introductionmentioning

confidence: 99%

Ion Irradiation Effects on Ho2+xTi2-xO7-x</>/2 (x=0, 0.4 and 0.67)

Wang

Wen

et al. 2012

KEM

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We recently synthesized different composition polycrystalline Ho2+xTi2-xO7-x/2 (x=0, 0.4 and 0.67), which is derivative fluorite compounds known as and pyrochlore phases in Ho3O2-TiO2 phase diagram by using conventional solid state synthesis methods. The samples were irradiated with 400 keV Ne2+ ions at cryogenic temperature (~77 K), using the Danfysik ion accelerator at the Ion Beam Materials Laboratory (IBML) of Los Alamos National Laboratory (LANL). The irradiation fluences in the experiments ranged from 5×1014-5×1015ions/cm2. An order-to-disorder (O-D) transformation was observed for α, β and pyrochlore phases, as determined using grazing incidence X-ray diffraction (GIXRD) at an incident angle of 0.25°. The O-D transformation threshold fluence for α phase was found to be noticeably lower than those for β phase and pyrochlore, and the O-D transformation threshold fluence for β phase was the highest. The O-D transformation threshold fluence was found to be coherent with the phase transformation temperature in the Ho3O2-TiO2temperature-composition (T-C) phase diagram.

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