Unexpected effects in non crystalline materials exposed to X-ray radiation

Bras, Wim; Stanley, Halina

doi:10.1016/j.jnoncrysol.2016.06.020

Cited by 19 publications

(19 citation statements)

References 70 publications

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“…The processes involved are expected to depend on the material absorption properties and on dis-excitation mechanisms, that in turns depend on the material composition and structure, the X-ray wavelength, irradiation dose and possibly from the X-ray flux and exposure time. Indeed, several mechanisms have been evoked so far in literature for material modifications induced by X-rays, including for instance sample heating, formation of electronic defects or excited states, photoreduction of metallic ions due to photoelectron generation, production of highly reactive species from solutions as a consequence of radiolysis, and modifications of the liquid surface tension due to surface charge accumulation 7 . On the other hand, A c c e p t e d m a n u s c r i p t in the specific case of Bi-2212, the creation of oxygen vacancies and the increase of crystallographic mosaicity have been considered as possibly responsible for the increase of the superconducting critical temperature after irradiation 6 .…”

Section: Introductionmentioning

confidence: 99%

Structural and functional modifications induced by X-ray nanopatterning in Bi-2212 single crystals

et al. 2018

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We have investigated the modifications induced in the high-Tc superconductor Bi2Sr2CaCu2O8+δ (Bi-2212) by X-ray nanopatterning, which is an innovative, photoresist-free, direct-writing approach recently used to fabricate proof-of-concept electrical devices [Truccato et al., Nano Lett. 2016, 16, 1669. By means of combined synchrotron microdiffraction and electrical transport measurements carried out on the same Bi-2212 microcrystal, we show that hard X-ray irradiation with fluences of the order of 10 12 J/m 2 , corresponding to doses of the order of 10 13 Gy, induces crystal fragmentation into multiple subdomains and decreases the carrier density of the system. We ascertain that the synergistic action of grain boundaries and of oxygen removal from the material dramatically changes the properties of Bi-2212 both in the normal and in the superconducting state. This special feature of X-ray nanopatterning introduces an opportunity that could be exploited to finely tune material structural defects according to the desired properties.

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Section: Introductionmentioning

confidence: 99%

Structural and functional modifications induced by X-ray nanopatterning in Bi-2212 single crystals

et al. 2018

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“…Today, peak brilliances up to 10 26 photons s À1 mm À2 mrad À2 (0.1% bandwidth) À1 are achieved with third-generation synchrotron sources, and X-ray beams with nanometric spot sizes of $50-100 nm and pulses of hundreds of photons s À1 with energies in the pJ range are routinely achieved (Mino et al, 2018;Martínez-Criado et al, 2016). However, the downside of this ongoing evolution of X-ray sources is that such beam characteristics can exceed the threshold where photon-flux density can affect the organization of matter (Bras & Stanley, 2016).…”

Section: Introductionmentioning

confidence: 99%

Time and space resolved modelling of the heating induced by synchrotron X-ray nanobeams

Bonino¹,

Torsello²,

Prestipino³

et al. 2020

J Synchrotron Radiat

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X-ray synchrotron sources, possessing high power density, nanometric spot size and short pulse duration, are extending their application frontiers up to the exploration of direct matter modification. In this field, the use of atomistic and continuum models is now becoming fundamental in the simulation of the photoinduced excitation states and eventually in the phase transition triggered by intense X-rays. In this work, the X-ray heating phenomenon is studied by coupling the Monte Carlo method (MC) with the Fourier heat equation, to first calculate the distribution of the energy absorbed by the systems and finally to predict the heating distribution and evolution. The results of the proposed model are also compared with those obtained removing the explicit definition of the energy distribution, as calculated by the MC. A good approximation of experimental thermal measurements produced irradiating a millimetric glass bead is found for both of the proposed models. A further step towards more complex systems is carried out, including in the models the different time patterns of the source, as determined by the filling modes of the synchrotron storage ring. The two models are applied in three prediction cases, in which the heating produced in Bi2Sr2CaCu2O8+δ microcrystals by means of nanopatterning experiments with intense hard X-ray nanobeams is calculated. It is demonstrated that the temperature evolution is strictly connected to the filling mode of the storage ring. By coupling the MC with the heat equation, X-ray pulses that are 48 ps long, possessing an instantaneous photon flux of ∼44 × 1013 photons s−1, were found to be able to induce a maximum temperature increase of 42 K, after a time of 350 ps. Inversely, by ignoring the energy redistribution calculated with the MC, peaks temperatures up to hundreds of degrees higher were found. These results highlight the importance of the energy redistribution operated by primary and secondary electrons in the theoretical simulation of the X-ray heating effects.

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“…This issue has been widely studied in the field of soft matter and protein crystallography since radiation damage is a major concern in experiments involving these systems . Inorganic hard condensed matter is generally much less sensitive to X‐rays, nevertheless the recent remarkable improvements in both brilliance of synchrotron radiation sources and performance of X‐ray focusing optics are pushing the power density on the sample to unprecedented values in nanobeam experiments, making radiation damage also relevant for inorganic materials . However, in the last years some studies suggested that this effect, which is generally undesired, could be exploited to modify materials in a controlled way.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the last years some studies suggested that this effect, which is generally undesired, could be exploited to modify materials in a controlled way. In this respect, a few interesting examples have been reported, including, for instance, redox reactions, X‐ray‐induced crystallization, metal–insulator and structural phase transitions 4a,8…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Local Conductivity of TiO₂ by X‐Ray Nanobeam Irradiation

Mino

Bonino

Picollo

et al. 2019

Adv Elect Materials

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It is well known that intense synchrotron beams can alter the state of materials, but this effect is generally considered undesired radiation damage. The effect of local irradiation of TiO2 rutile single crystals is investigated by a 56 × 57 nm2 synchrotron X‐ray nanobeam at 17.4 keV. Aside from a transient increase of conductivity due to a photovoltaic‐like process, a nonvolatile localized change of resistance by about 4 orders of magnitude is measured after X‐ray exposure. This effect can be ascribed to the local generation of oxygen vacancies by the X‐ray nanoprobe, which are subsequently ordered by the electric field applied during the acquisition of I–V curves. These results demonstrate that intense synchrotron beams can create oxygen vacancies in materials with tightly bound oxygen atoms, highlighting that X‐ray nanoprobes could become an effective tool for oxide nanofabrication, able to locally tune the material resistivity. For instance, since the localized presence and migration of oxygen vacancies is an essential requisite for redox‐based memristive devices, the possibility to locally induce oxygen vacancies could represent a novel tool for the production of oxide‐based memristive devices, replacing the problematic electroforming step.

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Unexpected effects in non crystalline materials exposed to X-ray radiation

Cited by 19 publications

References 70 publications

Structural and functional modifications induced by X-ray nanopatterning in Bi-2212 single crystals

Structural and functional modifications induced by X-ray nanopatterning in Bi-2212 single crystals

Time and space resolved modelling of the heating induced by synchrotron X-ray nanobeams

Tailoring the Local Conductivity of TiO₂ by X‐Ray Nanobeam Irradiation

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Unexpected effects in non crystalline materials exposed to X-ray radiation

Cited by 19 publications

References 70 publications

Structural and functional modifications induced by X-ray nanopatterning in Bi-2212 single crystals

Structural and functional modifications induced by X-ray nanopatterning in Bi-2212 single crystals

Time and space resolved modelling of the heating induced by synchrotron X-ray nanobeams

Tailoring the Local Conductivity of TiO2 by X‐Ray Nanobeam Irradiation

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Tailoring the Local Conductivity of TiO₂ by X‐Ray Nanobeam Irradiation