Results 1 to 10 of about 467,553 (75)

Iron-silica interaction during reduction of precipitated silica-promoted iron oxides using in situ XRD and TEM [PDF]

Applied Catalysis A: General 613 (2021) 118031, 2021
The effect of silica-promotion on the reduction of iron oxides in hydrogen was investigated using in situ X-ray diffraction and aberration-corrected transmission electron microscopy to understand the mechanism of reduction and the identity of the iron(II) silicate phase that has historically been designated as the cause of the iron-silica interaction ...
arxiv   +1 more source

The Chemical Evolution of Galaxy Clusters: Dissecting the Iron Mass Budget of the Intracluster Medium [PDF]

A&A 637, A58 (2020), 2020
We study the chemical evolution of galaxy clusters by measuring the iron mass in the ICM after dissecting the abundance profiles into different components. We use Chandra archival observations of 186 morphologically regular clusters in the redshift range [0.04, 1.07]. For each cluster we compute the iron abundance and gas density profiles.
arxiv   +1 more source

Nucleation and growth of iron pebbles explains the formation of iron-rich planets akin to Mercury [PDF]

A&A 662, A19 (2022), 2022
The pathway to forming the iron-rich planet Mercury remains mysterious. Mercury's core makes up 70% of the planetary mass, which implies a significant enrichment of iron relative to silicates, while its mantle is strongly depleted in oxidized iron. The high core mass fraction is traditionally ascribed to evaporative loss of silicates, e.g.
arxiv   +1 more source

Forming super-Mercuries: The role of stellar abundances [PDF]

A&A 673, A17 (2023), 2023
Super-Mercuries, rocky exoplanets with bulk iron mass fraction of more than 60 per cent, appear to be preferentially hosted by stars with higher iron mass fraction than the Earth. It is unclear whether these iron-rich planets can form in the disc, or if giant impacts are necessary.
arxiv   +1 more source

Superconducting Gaps via Raman Scattering in Iron Superconductors [PDF]

PRB(Rapid) 89, 180509 (2014), 2014
We investigate non-resonant Raman response for iron-based superconductors using the framework of an effective S4 model that was recently proposed to capture the essential electronic and magnetic properties of Iron based superconductors. We compute the momentum matrix elements and the resulting Raman vertices exactly for different polarization ...
arxiv   +1 more source

First-principles modeling of the interactions of iron impurities with graphene and graphite [PDF]

, 2010
Results of first principles modelling of interactions graphene and graphite with iron impurities predict the colossal difference between these two carbon allotropes. Insertion of the iron atoms between the planes of graphite is much more energetically favourable than adsorption of the iron adatom at graphite or graphene surface.
arxiv   +1 more source

Magnetoelastic Effects in Iron Telluride [PDF]

Phys. Rev. B 83, 115109 (2011), 2010
Iron telluride doped lightly with selenium is known to undergo a first order magneto-structural transition before turning superconducting at higher doping. We study the effects of magneto-elastic couplings on this transition using symmetry considerations.
arxiv   +1 more source

Iron role paradox in nerve degeneration and regeneration [PDF]

Bolandghamat, S., & Behnam-Rassouli, M. (2024). Iron role paradox in nerve degeneration and regeneration. Physiological Reports, 12, e15908
Iron accumulates in the neural tissue during peripheral nerve degeneration. Some studies have already been suggested that iron facilitates Wallerian degeneration (WD) events such as Schwann cell de-differentiation. On the other hand, intracellular iron levels remain elevated during nerve regeneration and gradually decrease.
arxiv   +1 more source

Isotopic constraints on genetic relationships among group IIIF iron meteorites, Fitzwater Pass, and the Zinder pallasite [PDF]

arXiv, 2023
Complex interelement trends among magmatic IIIF iron meteorites are difficult to explain by fractional crystallization and have raised uncertainty about their genetic relationships. Nucleosynthetic Mo isotope anomalies provide a powerful tool to assess if individual IIIF irons are related to each other.
arxiv  

Basic electronic properties of iron selenide under variation of structural parameters [PDF]

Phys. Rev. B 96, 125107 (2017), 2017
Since the discovery of high-temperature superconductivity in the thin-film FeSe/SrTiO$_3$ system, iron selenide and its derivates have been intensively scrutinized. Using ab initio density functional theory calculations we review the electronic structures that could be realized in iron-selenide if the structural parameters could be tuned at liberty. We
arxiv   +1 more source