Ion irradiation-induced amorphization of six zirconolite compositions

Wang, S.X; Lumpkin, Gregory R.; Wang, L.M; Ewing, Rodney C.

doi:10.1016/s0168-583x(99)00665-5

Cited by 43 publications

(25 citation statements)

References 30 publications

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“…The change in the relative intensities and the disappearance of the perovskite superlattice maxima (h + l = 2n + 1 for the following zone axis: [-210], ; h + l = 2n + 1 or k = 2n + 1 for [00-1] zone axis) indicate loss of the perovskite superlattice although, as in the zirconolite, the fluorite subcell was retained. Such microstructural modifications (change in the relative intensities, disappearance of superlattice maxima of the pristine material structure) for zirconolite and perovskite have been reported previously [10] An ELNES study on the Ti L 3,2 edges of the thinner samples was performed to investigate the change between the pristine and damaged regions. Figure 6b shows a series of spectra taken in the Nd-doped perovskite across the pristine (point analysis 1 in Figure 6a) and irradiated parts (point analysis 2 to 4 in Figure 6a).…”

Section: Kr Irradiated Samplessupporting

confidence: 69%

Krypton irradiation damage in Nd-doped zirconolite and perovskite

Davoisne

Stennett

Hyatt

et al. 2011

Journal of Nuclear Materials

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Understanding the effect of radiation damage and noble gas accommodation in potential ceramic hosts for plutonium disposition is necessary to evaluate the long-term behaviour during geological disposal. Polycrystalline samples of Nd-doped zirconolite and Nd-doped perovskite were irradiated ex-situ with 2 MeV Kr + at a dose of 5x10 15 ions.cm -2 to simulate plutonium nuclei recoil during alpha decay. The feasibility of thin section preparation of both pristine and irradiated samples by Focussed Ion Beam sectioning was demonstrated. After irradiation, the Nd-doped zirconolite revealed a well defined amorphous region separated from the pristine material by a thin (40-60 nm) damaged interface. The Nd-doped perovskite contained a defined irradiated region composed of an amorphous region surrounded by damaged regions. In both samples, as revealed by electron diffraction, the damaged regions and interface have a structure in which the fluorite sublattice is present while the pristine lattice is absent. In addition in Nddoped perovskite, the amorphisation dose depended on crystallographic orientation and possibly sample configuration (thin section and bulk). In Nd-doped perovskite, Electron Energy Loss Spectroscopy study revealed a change in Ti coordination associated with the crystal to amorphous transition.

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Section: Kr Irradiated Samplessupporting

confidence: 69%

Krypton irradiation damage in Nd-doped zirconolite and perovskite

Davoisne

Stennett

Hyatt

et al. 2011

Journal of Nuclear Materials

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“…Following these early in situ TEM studies of radiation effects in zircon, extensive experiments were performed on a wide variety of ceramics, such as pyrochlore Lian et al, 2002bLian et al, , 2003aLian et al, , 2004aLian et al, ,b, 2006aLian et al, ,c, 2007aLumpkin, 2006;Lumpkin et al, 2004;Meldrum et al, 2001;Wang et al, 1999cWang et al, , 2000c, perovskite (Sabathier et al, 2005;Smith and Zaluzec, 2005;Soulet et al, 2001b;Trachenko et al, 2004) and zirconolite (Berry et al, 2005;Ewing and Wang, 1992;Hadley et al, 2005;Lumpkin, 2001;Smith et al, 1997;Wang et al, 1999cWang et al, , 2000b, apatites (Meldrum et al, 1997b;Utsunomiya et al, 2003;Wang and Ewing, 1992b;Wang et al, 1994), brannerite (Lian et al, 2002a;Lumpkin et al, 2001), spinel (Bordes et al, 1995;Yasuda et al, 1998), alumina (Pells, 1994), garnet (Utsunomiya et al, 2002(Utsunomiya et al, , 2005, and murataite (Lian et al, 2005b,c), and the damage mechanisms and materials response have been investigated as a Complete amorphization was achieved at 0.55 dpa (Modified with permission from Weber et al, J Mater Res, 1994, 9, 688-698, Material Research Society). function of chemical composition (Lian et al, 2006c;Meldrum et al, 2001), ionicity…”

Section: Zirconmentioning

confidence: 99%

In situ TEM of radiation effects in complex ceramics

Lian

Wang

Sun

et al. 2009

Microscopy Res & Technique

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In situ transmission electron microscopy (TEM) has been extensively applied to study radiation effects in a wide variety of materials, such as metals, ceramics and semiconductors and is an indispensable tool in obtaining a fundamental understanding of energetic beam-matter interactions, damage events, and materials' behavior under intense radiation environments. In this article, in situ TEM observations of radiation effects in complex ceramics (e.g., oxides, silicates, and phosphates) subjected to energetic ion and electron irradiations have been summarized with a focus on irradiation-induced microstructural evolution, changes in microchemistry, and the formation of nanostructures. New results for in situ TEM observation of radiation effects in pyrochlore, A(2)B(2)O(7), and zircon, ZrSiO(4), subjected to multiple beam irradiations are presented, and the effects of simultaneous irradiations of alpha-decay and beta-decay on the microstructural evolution of potential nuclear waste forms are discussed. Furthermore, in situ TEM results of radiation effects in a sodium borosilicate glass subjected to electron-beam exposure are introduced to highlight the important applications of advanced analytical TEM techniques, including Z-contrast imaging, energy filtered TEM (EFTEM), and electron energy loss spectroscopy (EELS), in studying radiation effects in materials microstructural evolution and microchemical changes. By combining ex situ TEM and advanced analytical TEM techniques with in situ TEM observations under energetic beam irradiations, one can obtain invaluable information on the phase stability and response behaviors of materials under a wide range of irradiation conditions.

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“…For example, the resistance to irradiation of materials has been shown to be related, amongst others, to the atomic structure [3,14] and topology [15][16][17], the ability of the network to accommodate lattice disorder [2,18], bond energies [19], glass-forming ability [20], melting point [21], or other physical properties [22]. In turn, the saturation of damage (defects) observed at high dosage has been suggested to arise when the network loses its crystalline order [6,13] or becomes unable to accommodate defect-induced swelling [23].…”

Section: Introductionmentioning

confidence: 99%

Enthalpy Landscape Dictates the Irradiation-Induced Disordering of Quartz

Krishnan

Wang

et al. 2017

Phys. Rev. X

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Under irradiation, minerals tend to experience an accumulation of structural defects, ultimately leading to a disordered atomic network. Despite the critical importance of understanding and predicting irradiationinduced damage, the physical origin of the initiation and saturation of defects remains poorly understood. Here, based on molecular dynamics simulations of α-quartz, we show that the topography of the enthalpy landscape governs irradiation-induced disordering. Specifically, we show that such disordering differs from that observed upon vitrification in that, prior to saturation, irradiated quartz accesses forbidden regions of the enthalpy landscape, i.e., those that are inaccessible by simply heating and cooling. Furthermore, we demonstrate that damage saturates when the system accesses a local region of the enthalpy landscape corresponding to the configuration of an allowable liquid. At this stage, a sudden decrease in the heights of the energy barriers enhances relaxation, thereby preventing any further accumulation of defects and resulting in a defect-saturated disordered state.

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Ion irradiation-induced amorphization of six zirconolite compositions

Cited by 43 publications

References 30 publications

Krypton irradiation damage in Nd-doped zirconolite and perovskite

Krypton irradiation damage in Nd-doped zirconolite and perovskite

In situ TEM of radiation effects in complex ceramics

Enthalpy Landscape Dictates the Irradiation-Induced Disordering of Quartz

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