Ion-beam irradiation and 244Cm-doping investigations of the radiation response of actinide-bearing crystalline waste forms

2015 ◽  
Vol 30 (9) ◽  
pp. 1516-1528 ◽  
Author(s):  
Sergey V. Yudintsev ◽  
Andrey A. Lizin ◽  
Tatiana S. Livshits ◽  
Sergey V. Stefanovsky ◽  
Sergey V. Tomilin ◽  
...  
Keyword(s):  
Ion Beam ◽  
Radiation Response ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Waste Forms ◽  
Image Position

Abstract

Ion-beam irradiation of Gd2Sn2O7 and Gd2Hf2O7 pyrochlore: Bond-type effect

2004 ◽  
Vol 19 (5) ◽  
pp. 1575-1580 ◽  
Author(s):  
Jie Lian ◽  
Rodney C. Ewing ◽  
L.M. Wang ◽  
K.B. Helean
Keyword(s):  
Room Temperature ◽  
Ion Beam ◽  
Pyrochlore Structure ◽  
Fluorite Structure ◽  
Structure Type ◽  
Radiation Response ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Bond Type ◽  
Wide Range

Ceramics with III-IV pyrochlore compositions, A3+2B4+2O7 (A = Y and rare earth elements; B = Ti, Zr, Sn, or Hf), show a wide range of responses to ion-beam irradiation. To evaluate the role of the B-site cations on the radiation stability ofthe pyrochlore structure-type, Gd2Sn2O7 and Gd2Hf2O7 have been irradiated by1 MeV Kr+. The results are discussed in terms of the ionic size and type ofbonding of Sn4+ and Hf4+ and compared to previous results for titanate andzirconate pyrochlores. Gd2Sn2O7 is sensitive to ion beam–induced amorphizationwith a critical amorphization dose of approximately 3.4 displacements per atom(dpa) (2.62 × 1015 ions/cm2) at room temperature and a critical amorphization temperature of approximately 350 K. Gd2Hf2O7 does not become amorphous at adose of approximately 4.54 displacement per [lattice] atom (3.13 × 1015 ions/cm2) at room temperature, but instead is transformed to a disordered fluorite structure upon ion-beam irradiation. Although the radius ratio of the A- to B-site cations provides a general indication of the type of radiation response of different pyrochlore compositions, the results for Gd2Sn2O7 emphasize the importance of bond type, particularly the covalency of the 〈Sn–O〉 bond in determining the radiation response.

Ion Beam-Induced Amorphization of the Pyrochlore Structure-Type: A Review

2003 ◽  
Vol 792 ◽  
Author(s):  
R. C. Ewing ◽  
J. Lian ◽  
L. M. Wang
Keyword(s):  
Structural Changes ◽  
Dominant Role ◽  
Ion Beam ◽  
Pyrochlore Structure ◽  
Fluorite Structure ◽  
Radiation Response ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Wide Range ◽  
The Ideal

ABSTRACTThis paper reviews the recent developments in the understanding of the radiation-damage processes in A2B2O7 (Fd3m; Z=8) pyrochlore-structure compounds. Pyrochlore structure compounds display a wide range of behaviors in response to ion beam irradiation. Some compositions, such as Gd2Ti2O7, are amorphized at relatively low doses (∼0.2 dpa at room temperature) while other compositions, such as Gd2Zr2O7, do not amorphize (even at doses of 36 dpa at 25 K) and instead disorder to a defect fluorite structure. The response to ion beam irradiation is highly dependent on compositional changes that affect both the structural distortion from the ideal fluorite structure and the associated energetics of the disordering process. Generally, the ionic size of the cations plays a dominant role in determining the radiation response of different pyrochlore compositions. However, the cation ionic radius ratio criteria cannot be applied all-inclusively in predicting the radiation “tolerance” of a pyrochlore. Systematic irradiation studies of the radiation response of rare-earth (A-site) pyrochlores in which B = Ti, Zr, and Sn have shown that the behavior of the pyrochlore also depends on the cation electronic structure, i.e., the type of bonding, which is closely related to the polyhedral distortion and structural deviation from the ideal fluorite structure. These structural changes affect the dynamic defect recovery process directly linked to the material's response to and recovery from irradiation.

Pedigree Construction and SSR Analysis of Broomcorn Millet Mutant by 12C6+ Ion Beam Irradiation

2018 ◽  
Vol 44 (1) ◽  
pp. 144
Author(s):  
Tian-Peng LIU ◽  
Kong-Jun DONG ◽  
Xi-Cun DONG ◽  
Ji-Hong HE ◽  
Min-Xuan LIU ◽  
...  
Keyword(s):  
Ion Beam ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Ssr Analysis ◽  
Broomcorn Millet

Investigation of the Mechanism of Conductivity of NbN Thin Films, Modified Under Composite Ion Beam Irradiation

2016 ◽  
Vol 7 (3) ◽  
pp. 172-179 ◽  
Author(s):  
B. A. Gurovich ◽  
K. E. Prikhodko ◽  
M. A. Tarkhov ◽  
A. G. Domantovsky ◽  
D. A. Komarov ◽  
...  
Keyword(s):  
Thin Films ◽  
Ion Beam ◽  
Beam Irradiation ◽  
Ion Beam Irradiation

Tuning surface wettability of Molybdenum Oxide nanorod mesh by low energy ion beam irradiation

2021 ◽  
pp. 109649
Author(s):  
Satyanarayan Dhal ◽  
Pritam Das ◽  
Arpita Patro ◽  
Madhuchhanda Swain ◽  
Sheela Rani Hota ◽  
...  
Keyword(s):  
Molybdenum Oxide ◽  
Ion Beam ◽  
Low Energy ◽  
Surface Wettability ◽  
Beam Irradiation ◽  
Ion Beam Irradiation

scholarly journals Ion Beam Nanopatterning of Biomaterial Surfaces

2021 ◽  
Vol 11 (14) ◽  
pp. 6575
Author(s):  
Yu Yang ◽  
Adrian Keller
Keyword(s):  
Material Properties ◽  
Ion Beam ◽  
The Self ◽  
Solid Surfaces ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Future Directions ◽  
Self Organized ◽  
Functional Surfaces ◽  
Biomaterial Surfaces

Ion beam irradiation of solid surfaces may result in the self-organized formation of well-defined topographic nanopatterns. Depending on the irradiation conditions and the material properties, isotropic or anisotropic patterns of differently shaped features may be obtained. Most intriguingly, the periodicities of these patterns can be adjusted in the range between less than twenty and several hundred nanometers, which covers the dimensions of many cellular and extracellular features. However, even though ion beam nanopatterning has been studied for several decades and is nowadays widely employed in the fabrication of functional surfaces, it has found its way into the biomaterials field only recently. This review provides a brief overview of the basics of ion beam nanopatterning, emphasizes aspects of particular relevance for biomaterials applications, and summarizes a number of recent studies that investigated the effects of such nanopatterned surfaces on the adsorption of biomolecules and the response of adhering cells. Finally, promising future directions and potential translational challenges are identified.

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