X-ray photoelectron spectra of 3d transition metal pyrites

Heide, H. van der; Hemmel, R.; Bruggen, C.F. van; Haas, C.

doi:10.1016/0022-4596(80)90543-5

Cited by 273 publications

(115 citation statements)

References 40 publications

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“…When going from Co͑S 2 ͒ 2− to Ni͑S 2 ͒ 2− the binding energy of the S 2p core level is increased by 0.1 eV. 19 This fact supports the above conclusion that particularly the interplay between the transition-metal and sulfur atoms is responsible for the observed BE variation. In CoS with a S 2− configuration the S 2p PE signal is found at 161.8 eV binding energy.…”

Section: Core-level Photoemissionsupporting

confidence: 76%

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Photoemission study of electronic structure of the half-metallic ferromagnetCo3Sn2S2

et al. 2009

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Surface electronic structure of polycrystalline and single-crystalline samples of the half-metallic ferromagnet Co 3 Sn 2 S 2 was studied by means of angle-resolved and core-level photoemissions. The experiments were performed in temperature regimes both above and below a Curie temperature of 176.9 K. The spectroscopic results are compared to local-spin density approximation band-structure calculations for the bulk samples. It is found that the surface sensitive experimental data are generally reproduced by the bulk computation suggesting that the theoretically predicted half-metallic properties of Co 3 Sn 2 S 2 are retained at the surface.

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Section: Core-level Photoemissionsupporting

confidence: 76%

“…This value is close to the ones observed in CoS 2 ͑778.1 eV͒ and CoSe 2 ͑778.3 eV͒, and would support a Co 2+ valence state. 19 In the cobalt lower valent CoSe compound, the Co 2p 3/2 binding energy is 778.7 eV. 22 However, the length of Co-S bonds in Co 3 Sn 2 S 2 indi- cates covalency.…”

Section: Core-level Photoemissionmentioning

confidence: 99%

Photoemission study of electronic structure of the half-metallic ferromagnetCo3Sn2S2

et al. 2009

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“…The doublet 707.2/720.0 eV is correlated with the iron disulphide species. The shoulder on the high-energy side of the F e 2~~;~ signal is not due to iron oxidation by oxygen but is a secondary maxima of the Fe2p3,> state [18]. We do not find evidence for a Fe2p signal imputable to the FeS species.…”

Section: Resultscontrasting

confidence: 54%

Thin Pyrite Films Prepared by Sulphurization of Electrodeposited Iron Films

Pimenta

Schröder

Kautek

1991

Ber Bunsenges Phys Chem

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Electrochemistry J Elementary Reactions J Endotaxy J Heteroepitaxy J Semiconductors J Spectroscopy, Photoelectron 1 Spectroscopy, X-ray J Thin Film Growth A simple procedure for the production of pyrite (FeS2) thin films starting from the pure elements is presented. A pure, highly (1 10) oriented polycrystalline iron precursor layer could be successfully electrodeposited. Direct sulphurization of those films on Mo foils resulted in pyrite with (200) oriented grains embedded in a randomly oriented matrix. No other iron sulphide phase like e.g. marcasite was observed. XPS shows the presence of at least 97% FeS2. Depth profiles demonstrate the stoichiometric homogeneity across the films.

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“…The X-ray photoelectron spectrum (XPS) of the CoSe 2 nanocrystals shows peaks at 778.7 and 54.4 eV, corresponding to the binding energies of the cobalt 2p 3/2 and selenium 3d 5/2 states. [14] In addition, X-ray fluorescence (XRF) analysis indicates that the ratio of Co:Se in the sample is approximately 1:1.80, which suggests that other cobalt selenide phases (for example, CoSe and Co 3 Se 4 ) may be present in small amounts. [15] Additional TEM analysis of the dispersion of cobalt nanocrystals prior to the addition of selenium showed that the cobalt nanocrystals assemble into wires (see Supporting Information), which are similar to the assemblies of hollow CoSe 2 nanocrystals.…”

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confidence: 99%

Magnetic‐Dipolar‐Interaction‐Induced Self‐Assembly Affords Wires of Hollow Nanocrystals of Cobalt Selenide

et al. 2006

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Self-assembly, an attractive and practical methodology, allows the formation of a wide range of nanostructures for promising applications-for example, nanoparticle arrays for new optical band-gap materials [1] or high-density magnetic recording media, [2] self-assembled monolayers (SAM) for nanometerthick films on a variety of substrates, [3] and nanofibers of selforganized small molecules or oligopeptides for drug delivery and tissue engineering.[4] Hydrogen bonding and/or van der Waals interactions are usually the driving forces that result in self-assembly at the nanoscale.[5] Despite extensive investigation, it is still difficult to control and predict the nanostructures resulting from these two types of forces. Although several recent reports have shown that magnetic dipolar interactions induce rather predictable nanoassemblies, [6,7] methods for maintaining these assemblies when the magnetic force decreases or vanishes have been less thoroughly investigated. Therefore, we decided to use the magnetic dipoles inherently associated with magnetic nanoparticles [8] to form 1D assemblies of hollow nanocrystals of semiconductors. [9] We chose to make wires of hollow nanocrystals of CoSe 2 to demonstrate the concept, because 1) the isolation of a nanonecklace of cobalt nanocrystals on a substrate from a dispersion after removal of the solvent [7] indicated that magnetic dipolar interactions are sufficient to maintain 1D assemblies of nanocrystals in solution; 2) the recently reported formation of hollow CoSe nanocrystals from cobalt nanocrystals through the Kirkendall effect [10] suggested that a similar process could be used to generate hollow CoSe 2 nanocrystals from 1D assemblies of cobalt nanocrystals; 3) hollow nanostructures have received considerable attention because they exhibit properties that differ from their solid counterparts; [11] and 4) nanowires of hollow nanocrystals of CoSe 2 are unknown. Herein, we show that when their sizes reach approximately 20 nm cobalt nanocrystals self-assemble into wires in solution at temperatures as high as 455 K. Through the nanoscale Kirkendall effect, [10,12] wires of hollow CoSe 2 nanocrystals form without loss of the preassembled nanostructure induced by the magnetic dipolar interactions of the cobalt nanocrystals. In control experiments, when the size of the cobalt nanocrystals is 6 nm, or when 20-nm cobalt nanocrystals are in an alternating magnetic field, no wires of hollow CoSe 2 nanocrystals form. These observations confirm that the magnetic interaction plays a key role in the formation of the nanowires of hollow CoSe 2 crystals. Several types of ferromagnetic metallic nanocrystals (iron, cobalt, nickel, FePt, or CoPt) can be prepared readily, and their selfassembly depends on the magnetic dipolar interactions of particles of a certain size. Therefore, the method shown herein should be a general route to 1D assemblies of hollow nanocrystals.The synthesis of wires of hollow CoSe 2 nanocrystals is easy and straightforward. Cobalt nanocrystals of approximatel...

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X-ray photoelectron spectra of 3d transition metal pyrites

Cited by 273 publications

References 40 publications

Photoemission study of electronic structure of the half-metallic ferromagnetCo3Sn2S2

Photoemission study of electronic structure of the half-metallic ferromagnetCo3Sn2S2

Thin Pyrite Films Prepared by Sulphurization of Electrodeposited Iron Films

Magnetic‐Dipolar‐Interaction‐Induced Self‐Assembly Affords Wires of Hollow Nanocrystals of Cobalt Selenide

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