A transmission electron microscopy study of radiation damages to β-dicalcium (Ca2SiO4) and M3-tricalcium (Ca3SiO5) orthosilicates

Noirfontaine, Marie‐Noëlle de; Dunstetter, F.; Courtial, Mireille; Signes-Frehel, M.; Wang, Guillaume; Gorse-Pomonti, Dominique

doi:10.1016/j.jnucmat.2015.10.060

Cited by 6 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the TEM can provide a method to induce structural changes by electron irradiation, as well as simultaneously allowing spatially imaging at the atomic scale . Although the transformations from a monocrystalline to a polycrystalline phase, even amorphization was reported in ceramic materials, − these phenomena are rarely examined in current battery materials. Moreover, recently, a large number of in situ TEM and EELS studies of lithium ion batteries were carried out, including the study of crystalline to amorphous transitions of Si-based anodes and phase-conversion reaction of transition metal compounds. − However, the in situ TEM imaging process always includes a superimposed effect of the electrochemical-triggered morphology and structure evolution, as well as the e-beam irradiation induced contributions to the beam-sensitive battery electrodes.…”

Section: Introductionmentioning

confidence: 99%

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li₂FeSiO₄ versus LiFePO₄

Wei

Voisard

et al. 2018

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Energy storage and conversion in Li-ion batteries involve dynamic Li storage and transport through a series of electrochemical metastable states (or quasi-equilibrium configuration). Therefore, an investigation of these metastable states is helpful to fully understand the lithium storage mechanism. An accurate understanding of the storage mechanism is a key factor in the design and optimization of the next-generation high-performance batteries. Here, we report the results obtained from electron irradiationinduced phase transitions in Li 2 FeSiO 4 and LiFePO 4 by electron microscopy. During prolonged irradiation, the crystalline Li 2 FeSiO 4 particles experienced a transition from a monocrystalline structure to an amorphous phase, with a subsequent recrystallization process (monoclinic to orthorhombic phase). The fine structure of the electron energy loss (ELNES) spectra showed the electron beam-sensitive characteristic of Li 2 FeSiO 4 that included the electron beam-induced mass loss (composition changes), formation of intermediate metastable states (Li 2−x FeSiO 4 ), structural distortion/amorphization and valence state variation, all of which are much less prominent in LiFePO 4 under the same flux of electron beam. These findings provide new insights into the structural stability of Li 2 FeSiO 4 and LiFePO 4 samples and is also important guidance in the characterization of electrode materials.

show abstract

Section: Introductionmentioning

confidence: 99%

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li₂FeSiO₄ versus LiFePO₄

Wei

Voisard

et al. 2018

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…Nevertheless, to this date, local and surface effects of radiation (UV, X-ray, and γ) on calcite crystals have remain an open question. In situ studies on HR-TEM microscopes have shown that low energy electron radiation induces the quick appearance of polycrystalline domains and posterior amorphization of calcite . Although clear differences can be traced to the physical origin of the radiation, such as the effect of photons and electrons on matter, no study regarding the physical changes of irradiated surfaces have been carried out.…”

Section: Introductionmentioning

confidence: 99%

“…In situ studies on HR-TEM microscopes have shown that low energy electron radiation induces the quick appearance of polycrystalline domains and posterior amorphization of calcite. 57 Although clear differences can be traced to the physical origin of the radiation, such as the effect of photons and electrons on matter, no study regarding the physical changes of irradiated surfaces have been carried out. In this article we present a study of the effects of radiation (UV, X-ray, and γ) on the mechanical and physicochemical properties of calcite single crystals, focusing on the surface changes at the nanoscale and their implications for nanoparticle/composite systems based on calcite nanocrystals/particles.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanoscale Effects of Radiation (UV, X-ray, and γ) on Calcite Surfaces: Implications for its Mechanical and Physico-Chemical Properties

et al. 2017

View full text Add to dashboard Cite

Calcite, the most stable polymorph of calcium carbonate (CaCO 3 ), attracts growing attention due to its wide applications in many fields, such as composite materials, food industry, biomineralization, and dating of archeological and geological objects. Our study shows the influence of UV, X-ray and γ-radiation on the mechanical and physicochemical properties of calcite at the nanoscale. Using nanoindentation technique we observed a clear detriment in the mechanical response (hardness and elastic modulus) of the calcite (104) surface after irradiation, most visible in the case of UV. Changes in mechanical properties were correlated with the accumulation of radiation defects detected using EPR spectroscopy, and information on chemical bonding and composition obtained through XPS analyses. Additionally, the efficiency in generating defects for all three types of radiation was compared, which allowed us to propose a possible mechanism of UVinduced formation of radiation defects in calcite.

show abstract

“…Interestingly, HRTEM analysis of elongated nanoparticles indicates that specific d-spacing measured at 9.28 Å match the (002) reflexions for Ca3SiO5, whilst no other material component species were compatible with this value. To support the assignation of elongated and faceted nanoparticles to tricalcium silicate, previous work has also described particles with sharp angles typically to Ca3SiO5 while round-shaped morphologies to Ca2SiO4 [24].…”

Section: Discussionmentioning

confidence: 96%

A Microstructure Insight of MTA Repair HP of Rapid Setting Capacity and Bioactive Response

2020

View full text Add to dashboard Cite

Mineral trioxide aggregate (MTA) is considered a bioactive endodontic material, which promotes natural mineralization at the material-tooth tissue interface. MTA Repair HP stands out because of the short setting time and the quick and effective bioactive response in vitro. The bioactivity, depens on material composition and microstructure. This work is devoted to analyze MTA Repair HP microstructural features, of both the powder precursor and set material, to get insights into the material physicochemical parameters—functionality performance relationships. Transmission electron microscopy (TEM), and field emission gun scanning electron microscopy (FEG-SEM) coupled with energy-dispersive X-ray (EDX) analyses were performed. X-ray diffraction (XRD) measurements were carried out at different times to investigate setting process. Bioactivity evaluation in vitro was carried out by soaking the processed cement disk in simulated body fluid (SBF). The presented results point out those MTA Repair HP precursor material characteristics of tricalcium silicate particles of nanometric size and high aspect ratio, which provide an elevated surface area and maximized components dispersion of calcium silicate and very reactive calcium aluminate. The MTA Repair HP precursor powder nanostructure and formulation, allows a hydration process comprising silicate hydrate structures, which are very effective to achieve both fast setting and efficient bioactive response.

show abstract

A transmission electron microscopy study of radiation damages to β-dicalcium (Ca2SiO4) and M3-tricalcium (Ca3SiO5) orthosilicates

Cited by 6 publications

References 34 publications

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li₂FeSiO₄ versus LiFePO₄

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li₂FeSiO₄ versus LiFePO₄

Nanoscale Effects of Radiation (UV, X-ray, and γ) on Calcite Surfaces: Implications for its Mechanical and Physico-Chemical Properties

A Microstructure Insight of MTA Repair HP of Rapid Setting Capacity and Bioactive Response

Contact Info

Product

Resources

About

A transmission electron microscopy study of radiation damages to β-dicalcium (Ca2SiO4) and M3-tricalcium (Ca3SiO5) orthosilicates

Cited by 6 publications

References 34 publications

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li2FeSiO4 versus LiFePO4

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li2FeSiO4 versus LiFePO4

Nanoscale Effects of Radiation (UV, X-ray, and γ) on Calcite Surfaces: Implications for its Mechanical and Physico-Chemical Properties

A Microstructure Insight of MTA Repair HP of Rapid Setting Capacity and Bioactive Response

Contact Info

Product

Resources

About

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li₂FeSiO₄ versus LiFePO₄

In Situ TEM Investigation of Electron Irradiation Induced Metastable States in Lithium-Ion Battery Cathodes: Li₂FeSiO₄ versus LiFePO₄