In situ TEM investigations of the microstructural changes and radiation tolerance in SiC nanowhiskers irradiated with He ions at high temperatures

Aradi, Emily; Lewis-Fell, Jacob; Greaves, Graeme; Donnelly, Stephen E.; Hinks, John

doi:10.1016/j.actamat.2021.116820

Cited by 12 publications

(4 citation statements)

References 60 publications

(74 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whilst contamination can be considered minimum during an irradiation performed within the TEM chamber, the ions used for irradiation may impact the experiments as they can accumulate and form gas bubbles. [ 33 ] However, the typical Fresnel fringes typically observed around gas bubbles when recorded out of focus in a TEM were not detected in this work, thus, indicating that the nanopores were not xenon gas bubbles. [ 33 ]…”

Section: Resultsmentioning

confidence: 67%

See 1 more Smart Citation

Nanostructuring Germanium Nanowires by In Situ TEM Ion Irradiation

Camara

Mir

Dzięcioł

et al. 2021

Part & Part Syst Charact

View full text Add to dashboard Cite

Once nanomaterials have been synthesized, inducing further structural modifications is challenging. However, being able to do so in a controlled manner is crucial. In this context, germanium nanowires are irradiated in situ within a transmission electron microscope (TEM) by a 300 keV xenon ion beam at temperatures ranging from room temperature (RT) to 500 °C. The ion irradiation is performed in situ and the evolution of nanowires during irradiation is monitored. At 300 °C and below, where the temperature is low enough to allow amorphization, the ion beam causes the formation of nanostructures within the nanowires. Formation of nanopores and swelling of nanowires is observed for a very low fluence of 2.2 × 1014 and up to 4.2 × 1015 ions cm−2. At higher fluences, the thickness of the nanowires decreases, the nanowires lose their wire‐like cylindrical shape and the nanostructuring caused by the ion beam becomes more complex. The nanostructures are observed to be stable upon crystallization when the nanowires are annealed at 530 °C. Furthermore, in situ imaging allows the growth of nanopores during irradiation to be followed at RT and at 300 °C providing valuable insights into the mechanism responsible for the nanostructuring.

show abstract

Section: Resultsmentioning

confidence: 67%

“…[ 33 ] However, the typical Fresnel fringes typically observed around gas bubbles when recorded out of focus in a TEM were not detected in this work, thus, indicating that the nanopores were not xenon gas bubbles. [ 33 ]…”

Section: Resultsmentioning

confidence: 78%

Nanostructuring Germanium Nanowires by In Situ TEM Ion Irradiation

Camara

Mir

Dzięcioł

et al. 2021

Part & Part Syst Charact

View full text Add to dashboard Cite

show abstract

“…More recently, irradiations were carried out using 6 keV He ions at temperatures between 500 and 1000 °C and doses up to 20 dpa. [40] Small defect clusters were observed in the SiC nanowhiskers together with a segregation of carbon at the surface of the nanowhiskers mapped using energy-filtered TEM at 600 °C. When the temperature increased to 800 °C, small He bubbles with diameter around 2-4 nm were observed in the SiC nanowhiskers matrix whereas He platelets and bubble discs formed in the foils.…”

Section: Radiation Defects In Nanocrystalline and Their Observationmentioning

confidence: 94%

“…The irradiation temperature also plays an essential role in the defect evolution of the microstructures. More recently, irradiations were carried out using 6 keV He ions at temperatures between 500 and 1000 °C and doses up to 20 dpa [40] . Small defect clusters were observed in the SiC nanowhiskers together with a segregation of carbon at the surface of the nanowhiskers mapped using energy‐filtered TEM at 600 °C.…”

Section: Grain Boundaries In Nanocrystalline Materialsmentioning

confidence: 99%

Recent Progress on Interfaces in Nanomaterials for Nuclear Radiation Resistance

Jiang

et al. 2022

ChemNanoMat

View full text Add to dashboard Cite

Interfaces including grain boundaries and heterophase interfaces could withstand the radiation damage via providing sites for trapping the defects. With the urgent demand for high radiation-tolerance nanostructured materials, exploration of the structural properties, especially the role of the interfaces on the radiation response in the nanomaterials, is of significant essentialness in developing the design of new radiation-resistant materials. Herein, the recent progress and development of two main kinds of interfaces, namely the grain boundaries in nanocrystalline and the hetero-phase interfaces in nanolayered materials and nano-composites, in nanostructured materials that are designed for radiation tolerance are summarized. In addition, the radiation response and resistant mechanism under irradiation conditions of the nanocrystalline materials like metals, single-phase alloys, and ceramics, as well as the nanocomposites like nanolayered metals, nanolayered ceramics, metal-carbon nanocomposite, and nanoparticle dispersed steels, are reviewed. Finally, challenges and perspectives are proposed to offer advice for the development of radiation resistance nanomaterials.

show abstract