Characterization of surface species on iron synthesis catalysts by X-ray photoelectron spectroscopy

Kuivila, C.; Butt, John; Stair, Peter C.

doi:10.1016/0169-4332(88)90076-1

Cited by 199 publications

(99 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the passivation potential increases, the O-'(Fe) fraction content (11) slightly decreases, and the iron hydroxides contribution (12) begins to increase. A constant behaviour is observed for component 13, whereas 14, associated with the aluminium hydroxides and/or water increases up to a maximum at 1 V of applied potential, confirming the same observation inferred from the A1 2p spectra.…”

Section: Binding Energy (Ev)mentioning

confidence: 97%

XPS study of passive films formed on an iron—aluminium intermetallic compound in acid solution

Frangini

Giorgi

Lascovich

et al. 1994

Surface & Interface Analysis

View full text Add to dashboard Cite

Surface films grown on the intermetallic B2-FeAI alloy after wet-mechanical polishing and after a wide range of anodic polarization conditions in 1N H2S04 have been analysed by x-ray photoeleclron spectroscopy. The results clearly indicate a remarkable enrichment of aluminium within all the films regardlless of the growth conditions. Analysis of the metal-oxygen bonds has made it possible to distinguish several oxidized species. It has been found that most of the iron hydroxides are concentrated on the film surfaces, whereas aluminium hydroxides appear more homogeneously distributed over the depth of the oxide films. The thickness of the film shows an abrupt increase at 1 V, accompanied by a marked increment of A1 hydroxide species.

show abstract

Section: Binding Energy (Ev)mentioning

confidence: 97%

XPS study of passive films formed on an iron—aluminium intermetallic compound in acid solution

Frangini

Giorgi

Lascovich

et al. 1994

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…11 The peak at around 400.5 eV is typical for amide and amine and can serve as a marker. 4 The core level spectra clearly show that the detected nitrogen is not bound in the form of nitrate (from HNO 3 ) (407.3 eV).…”

Section: Biofilm and Bacteria Removalmentioning

confidence: 99%

Removing biofilms from stainless steel without changing surface properties relevant for bacterial attachment

et al. 2017

View full text Add to dashboard Cite

The influence of oxygen (and argon) plasma cleaning and a base-acid cleaning procedure on stainless steel surfaces was studied. The main aim was to clean stainless steel samples from Paracoccus seriniphilus biofilms without changing the surface properties which are relevant for bacterial attachment to allow reuse in a biofilm reactor. It is shown that oxygen plasma cleaning, which very successfully removes the same kind of biofilm from titanium surfaces, is not suitable for stainless steel. It largely influences the surface chemistry by producing thick metal oxide layers of varying compositions and changing phenomenological surface properties such as wettability. A promising method without changing surface properties while cleaning satisfactorily is a combination of base and acid reagents at elevated temperature.

show abstract

“…Note the small shoulder of the Fe absorption line at þ1:6 eV with respect to the main L 3 edge. It is absent for the annealed particles and might be due to the different chemical environment of Fe atoms at the NP-C interface, or to interstitial C atoms [31]. Its disappearance upon annealing would accordingly be attributed to graphitization of the amorphous C matrix at the NP surface [32,33], or to segregation of C interstitials due to the increased mixing enthalpy in the bcc phase [34].…”

mentioning

confidence: 99%

Low Temperature Ferromagnetism in Chemically Ordered FeRh Nanocrystals

et al. 2013

View full text Add to dashboard Cite

In sharp contrast to previous studies on FeRh bulk, thin films, and nanoparticles, we report the persistence of ferromagnetic order down to 3 K for size-selected 3.3 nm diameter nanocrystals embedded into an amorphous carbon matrix. The annealed nanoparticles have a B2 structure with alternating atomic Fe and Rh layers. X-ray magnetic dichroism and superconducting quantum interference device measurements demonstrate ferromagnetic alignment of the Fe and Rh magnetic moments of 3 and 1 B , respectively. The ferromagnetic order is ascribed to the finite-size induced structural relaxation observed in extended x-ray absorption spectroscopy. DOI: 10.1103/PhysRevLett.110.087207 PACS numbers: 75.30.Kz, 75.75.Cd, 81.07.Bc Iron-rhodium alloys exhibit competing ferromagnetic (FM) and antiferromagnetic (AFM) phases with transition temperatures close to ambient for nearly equiatomic composition and body-centered-cubic (bcc) CsCl-like B2 structure. The competition between the two magnetic orders of FeRh holds great potential in spintronics and heat assisted magnetic recording [1,2]. Moreover, the peculiar bulk FeRh magnetic phase diagram enables its use as active material in heat pumps and refrigerators [3][4][5].At ambient conditions, bulk B2 FeRh is a G-type AFM with a total magnetic moment on the iron atoms of 3:3 B and no appreciable moment on the rhodium atoms [6][7][8]. Above the transition temperature of 370 K, the atomic moments of Fe and Rh are ferromagnetically aligned and take on total values of 3.2 and 0:9 B , respectively [6][7][8]. While it has long been known that the bcc unit cell volume expands by % 1% upon transforming to FM order [9], recent experiments suggest that distortions of the bcc structure may occur [10]. Given the itinerant character of the 3d electrons, the coupling between crystallographic and magnetic order in this system is both rich and very delicate as demonstrated by the theoretical challenge to model the system [11], as well as by recent pump-probe experiments focusing on ultrafast magnetization control [12].Finite-size systems of this alloy have received particular attention by their potential to stabilize the FM phase at room temperature and below. Strained thin films [13,14] showed traces of a FM phase down to 300 K, while ab initio calculations predicted FM down to 0 K for a Rh-terminated 9 ML FeRh(001) film [15] and for 8-atom FeRh clusters [16]. Indeed, since nanosized crystals may present significantly different interatomic distances and unit cell distortions with respect to bulk [17,18], a fundamentally modified magnetic phase diagram can be expected for FeRh nanocrystals. However, the first experiments on chemically synthesized FeRh nanoparticles (NPs) failed to evidence low temperature stability of the FM phase. Most notably, they raised important questions, such as partial B2 ordering, elemental segregation, and coalescence upon annealing [19][20][21].In this Letter, we demonstrate the persistence of FM order down to below 3 K in size-selected FeRh nanocrystals with a mean d...

show abstract

Characterization of surface species on iron synthesis catalysts by X-ray photoelectron spectroscopy

Cited by 199 publications

References 30 publications

XPS study of passive films formed on an iron—aluminium intermetallic compound in acid solution

XPS study of passive films formed on an iron—aluminium intermetallic compound in acid solution

Removing biofilms from stainless steel without changing surface properties relevant for bacterial attachment

Low Temperature Ferromagnetism in Chemically Ordered FeRh Nanocrystals

Contact Info

Product

Resources

About