Damage cross-sections of heavy ions in crystal structures

Karioris, Frank G.; Gowda, K. Appaji; Cartz, L.; Labbé, Jean‐Claude

doi:10.1016/0022-3115(82)90549-9

Cited by 53 publications

(10 citation statements)

References 5 publications

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“…The track morphology depends on the value of the energy loss for the high energy ions. The disorder region formed along the ion track is represented as a cylinder along ion trajectory [11][12][13][14]. The cross section of disorder region a has been given by I r /I 0 = e Àar , I r,0 being XRD peak intensities at fluence r, 0.…”

Section: X-ray Diffractionmentioning

confidence: 99%

High energy heavy ion induced structural disorder in Li2TiO3

Nakazawa

Naito

Aruga

et al. 2007

Journal of Nuclear Materials

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Section: X-ray Diffractionmentioning

confidence: 99%

High energy heavy ion induced structural disorder in Li2TiO3

Nakazawa

Naito

Aruga

et al. 2007

Journal of Nuclear Materials

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“…Although there is considerable scatter in the data, the trend is distinctly nonlinear. Kariorsis et al 1982 have shown that XRD intensity ratios can be described by an exponential function of the form:…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Alpha-decay damage in minerals of the pyrochlore group

1988

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Abstract. X-ray diffraction analysis and transmission electron microscopy have been used to study the effects of alpha-decay damage in pyrochlore group minerals, characterized by the general formula A1 ,~BzO6(O,OH,F)I -n'pH20.As defined by the XRD intensity ratio I/Io, both the saturation dose (for which I/Io =0.1-0.0) and the dose which signifies the initial loss of crystallinity (for which I/Io = 1.0-0.8) increase as a function of geologic age. The increase is attributed to annealing of isolated alpha-recoil tracks back to the original crystalline structure. The tracks have calculated mean lives, za, on the order of 108 years. In contrast, minerals which remain crystalline (e.g., uraninite, UO2) despite doses of up to 1018 alpha-events/mg have mean alpha-recoil track lives ~ 104 years (Eyal and Fleischer 1985).After correcting the calculated dose for annealing of alpha-recoil damage, I/Io is observed to decrease exponentially to zero over the dose range 0.02-1.0 x 1016 alphaevents/rag. The relationship between I/Io and "corrected" dose was used to calculate an average alpha-recoil track diameter of 4.6 nm, in which < 2600 atoms are displaced. XRD line broadening due to strain dominates the first half of the crystalline-to-metamict transition, reaching a maximum of 0.003, then decreasing to < 0.001. Line broadening due to decreasing crystallite size dominates the latter half of the transition. Estimated crystallite dimensions decrease from 450 nm to < 15 nm prior to reaching the fully metamict state. With increasing dose HRTEM images of microlites from the Harding pegmatite sequentially exhibit: 1) mottled diffraction contrast, 2) isolated 1-5 nm aperiodic areas, 3) coexisting aperiodic and crystalline areas, 4) relict" islands" of crystalline material in an aperiodic matrix, and 5) complete loss of lattice fringe periodicity. With no consideration given to alpha-recoil track fading, the transition covers a dose range of 0.04-1.7x 1017 alpha-events/mg. Using a value of za=108 years, this dose range is corrected down to 0.02-1.2 x 10 ~6 alpha-events/mg.The metamict state is characterized by a range of M-M and M-O distances which give rise to bands of diffuse scattering centered at 0.30 nm and 0.18 nm, respectively, in x-ray and electron diffraction patterns. Random image contrast shown by HRTEM is consistent with a random network type structure, an interpretation supported by EX-AFS/XANES studies (Greegor et al. 1985a(Greegor et al. , b, 1987. The structure of metamict pyrochlore consists of an aperiodic framework of corner-sharing B--O polyhedra. Compared to the crystalline precursor, the metamict state displays a reduced M-O coordination number and mean bond length, increased distortion of the B-site, and a slight increase in the average M-M distance.

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“…The corresponding energy loss per unit length is termed as electronic stopping “S e ” and nuclear spotting “S n .” However, for SHI, energy transfer takes place through electronic energy loss mechanism mainly. S e thus plays a dominant role in determining the properties of irradiated materials . The solid‐ion interaction in the target material may produce different types of defects depending upon the value of S e .…”

Section: Introductionmentioning

confidence: 99%

Swift heavy ion induced material modifications in Ba_1‐xSr_xTiO₃ ceramics as probed by temperature‐dependent Raman spectroscopy

Bajpai

Mohan

Ganjir

et al. 2017

J Raman Spectroscopy

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Effect of 100 MeV O8+ swift heavy ion (SHI) irradiation on phonon properties of Ba1‐xSrxTiO3 (x = 0.10, 0.15) ceramics are probed using Raman spectroscopy. Temperature‐dependent Raman spectra in the range (100 °C to −190 °C) have been investigated, and deconvoluted Raman modes parameters are used in pristine and irradiated ceramics to understand the effect of ion irradiation on phonon modes. Raman bands are successfully identified that discern changes in band parameters during transition from cubic → tetragonal → orthorhombic → rhombohedral phases. Raman spectral analysis reveals that the phase transition sequence remains almost unaffected after SHI irradiation; however, band parameters (band positions, band intensity, and line widths) of some phonon modes show changes after SHI irradiation. Results are interpreted in terms of grain reorientation and oxygen vacancies annihilation due to irradiation. Comparisons of ferroelectric properties in pristine and irradiated ceramics unambiguously reveal that surface or near surface material modifications influence the bulk properties of these polar materials.

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Damage cross-sections of heavy ions in crystal structures

Cited by 53 publications

References 5 publications

High energy heavy ion induced structural disorder in Li2TiO3

High energy heavy ion induced structural disorder in Li2TiO3

Alpha-decay damage in minerals of the pyrochlore group

Swift heavy ion induced material modifications in Ba_1‐xSr_xTiO₃ ceramics as probed by temperature‐dependent Raman spectroscopy

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Damage cross-sections of heavy ions in crystal structures

Cited by 53 publications

References 5 publications

High energy heavy ion induced structural disorder in Li2TiO3

High energy heavy ion induced structural disorder in Li2TiO3

Alpha-decay damage in minerals of the pyrochlore group

Swift heavy ion induced material modifications in Ba1‐xSrxTiO3 ceramics as probed by temperature‐dependent Raman spectroscopy

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Product

Resources

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Swift heavy ion induced material modifications in Ba_1‐xSr_xTiO₃ ceramics as probed by temperature‐dependent Raman spectroscopy