Swift heavy ion induced modifications of luminescence and mechanical properties of polypropylene/ZnO nanocomposites

Maniks, J.; Grigorjeva, L.; Zabels, R.; Millers, D.; Bochkov, Ivan; Zicāns, Jānis; Ivanova, Tatjana; Grabis, Jānis

doi:10.1016/j.nimb.2013.10.090

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…It may be considered that the energy introduced by 100 MeV O 7+ ions into ZnFe 2 O 4 gives rise to thermal spikes. [68][69][70] These thermal spikes transfer energy to the lattice and appear and disappear after regular intervals, transferring energy to the lattice after certain intervals. An excess of this energy may cause the breakage of metal-oxygen bonds.…”

Section: Metal-oxygen and Metal-metal Bond Lengths And Cation Redistr...mentioning

confidence: 99%

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe₂O₄: XAS-XMCD investigations

Singh

Kaur

Sharma

et al. 2018

Phys. Chem. Chem. Phys.

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The interactions of energetic ions with multi-cation compounds and their consequences in terms of changes in the local electronic structure, which may facilitate intriguing hybridization between O 2p and metal d orbitals and magnetic ordering, are the subject of debate and require a deep understanding of energy transfer processes and magnetic exchange mechanisms. In this study, nanocrystals of ZnFe2O4 were exposed to O7+ ions with an energy of 100 MeV to understand, qualitatively and quantitatively, the metal-ligand field interactions, cation migration and magnetic exchange interactions by employing X-ray absorption fine structure measurements and X-ray magnetic circular dichroism to get deeper mechanistic insights. Nanosized zinc ferrite nanoparticles (NPs) with a size of ∼16 nm synthesized in the cubic spinel phase exhibited deterioration of the crystalline phase when 100 MeV O7+ ions passed through them. However, the size of these NPs remained almost the same. The behaviour of crystal deterioration is associated with the confinement of heat in this interaction. The energy confined inside the nanoparticles promotes cation redistribution as well as the modification of the local electronic structure. Prior to this interaction, almost 42% of Zn2+ ions occupied AO4 tetrahedra; however, this value increased to 63% after the interaction. An inverse effect was observed for metal ion occupancies in BO6 octahedra. The L-edge spectra of Fe and Zn reveal that the spin and valence states of the metal ions were not affected by this interaction. This effect is also supported by K-edge measurements for Fe and Zn. The t2g/eg intensity ratio in the O K-edge spectra decreased after this interaction, which is associated with detachment of Zn2+ ions from the lattice. The extent of hybridization, as estimated from the ratio of the post-edge to the pre-edge region of the O K-edge spectra, decreased after this interaction. The metal-oxygen and metal-metal bond lengths were modified as a result of this interaction, as determined from extended X-ray absorption fine structure measurements. These measurements further support the observation of cation migration from AO4 tetrahedra to AO6 octahedra and vice versa. The Fe L-edge magnetic circular dichroism spectra indicate that Fe3+ ions occupying sites in AO4 tetrahedra and BO6 octahedra exhibited antiferromagnetic-like ordering prior to this interaction. The NPs that interacted with energetic O ions displayed a different kind of magnetic ordering.

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Section: Metal-oxygen and Metal-metal Bond Lengths And Cation Redistr...mentioning

confidence: 99%

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe₂O₄: XAS-XMCD investigations

Singh

Kaur

Sharma

et al. 2018

Phys. Chem. Chem. Phys.

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“…This index coincides with δН [13]. Another known measure of plasticity is the plasticity index PI = Ap / At, where Ap and At are the work expended on plastic and total deformation [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 90%

Determination of New Plasticity Characteristic of Alloys at Mechanical Compression and Tensile Tests and the Influence of Structural Factors on Plasticity

Milman¹,

Galanov²,

Goncharuk³

et al. 2022

SSP

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In physics and mechanics, plasticity is defined as the ability of a material to undergo irreversible (plastic) deformation. Conventionally, the plastic strain at fracture in tensile tests, δ, has been used as a quantitative measure of plasticity. However, δ does not follow the scientific definition of plasticity. The influence of structural factors, temperature and strain rate on the value of δ were not elaborated over many decades. This lack of well-founded quantitative characteristic hindered efforts to control and to increase plasticity of materials. The plasticity characteristic that corresponds to the scientific definition of this quantity, δ* = plastic strain εр/ total strain εt, has been successfully used by many scientists to determine plasticity δ* by indentation. In the present work, the technique for the determination of the plasticity characteristic δ* during mechanical compression and tensile tests of metallic alloys has been introduced for the first time. In this case, δ* is determined more precisely than by indentation, and the second deformation curve δ*=f*(εt) is constructed. A theory of the influence of structural factors (grain size, dislocation density, disperse particles of the second phase) on the plasticity characteristic δ* has now been developed, making it possible to estimate the influence of the indicated factors on δ* and to design alloys with an optimal combination of strength and plasticity. The discovered correlation of the values of δ* and δ for steels and for aluminum alloys allows us to use the developed theory to calculate the influence of the structural factors on d for these materials as well.

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Influence of the pH on the ZnO nanoparticle growth in supercritical water: Experimental and simulation approaches

Demoisson

Piolet

Ariane

et al. 2014

The Journal of Supercritical Fluids

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Swift heavy ion induced modifications of luminescence and mechanical properties of polypropylene/ZnO nanocomposites

Cited by 6 publications

References 13 publications

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe₂O₄: XAS-XMCD investigations

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe₂O₄: XAS-XMCD investigations

Determination of New Plasticity Characteristic of Alloys at Mechanical Compression and Tensile Tests and the Influence of Structural Factors on Plasticity

Influence of the pH on the ZnO nanoparticle growth in supercritical water: Experimental and simulation approaches

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Swift heavy ion induced modifications of luminescence and mechanical properties of polypropylene/ZnO nanocomposites

Cited by 6 publications

References 13 publications

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe2O4: XAS-XMCD investigations

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe2O4: XAS-XMCD investigations

Determination of New Plasticity Characteristic of Alloys at Mechanical Compression and Tensile Tests and the Influence of Structural Factors on Plasticity

Influence of the pH on the ZnO nanoparticle growth in supercritical water: Experimental and simulation approaches

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Product

Resources

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Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe₂O₄: XAS-XMCD investigations

Mechanistic insights into the interaction between energetic oxygen ions and nanosized ZnFe₂O₄: XAS-XMCD investigations