Pyrite type compounds — With particular reference to optical characterization

Sato, K.

doi:10.1016/0146-3535(85)90032-2

Cited by 49 publications

(8 citation statements)

References 78 publications

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“…This structure is common to a series of transition metal disulfides, from MnS2 to ZnS2. In the last fifteen years a considerable number of experimental and theoretical studies of the electronic structures of these so-called pyrite-type disulfides, MS2 (M--Mn, Fe, Co, Ni, Cu, Zn) have been reported, and reviewed by Tossell et al (1981), Sato (1985) and Tossell and Vaughan (1992). As the crystal field splitting, d-electron correlation and intrinsic 3d band-widths are of similar magnitudes, this series of compounds displays a large variety of electrical, magnetic and optical properties.…”

Section: Introductionmentioning

confidence: 98%

X-ray absorption near-edge spectra of transition metal disulfides FeS2 (pyrite and marcasite), CoS2, NiS2 and CuS2, and their isomorphs FeAsS and CoAsS

et al. 1995

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Abstract. Metal K-and L3-, sulfur K-and arsenic K-and L3-edge X-ray absorption near-edge spectra of a series of metal disulfides, FeS2 (both pyrite and marcasite), COS2, NiS2, and CuS2, and their isomorphs, FeAsS and CoAsS, are presented. The features in this region of these spectra are interpreted using band structure and molecular orbital calculations in terms of the transitions from the ls or 2p3/2 state to unoccupied states. The 3d transition metal L3-edge spectra of these materials show dependence on the degree of multiplet splitting in the final state, and thus offer less information on the electronic ground state. There are substantial differences in the spectra of the isostructural materials, whereas the spectra of the isotopes pyrite and marcasite show several similarities, illustrating the dependence of near-edge region on electronic structure.

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Section: Introductionmentioning

confidence: 98%

X-ray absorption near-edge spectra of transition metal disulfides FeS2 (pyrite and marcasite), CoS2, NiS2 and CuS2, and their isomorphs FeAsS and CoAsS

et al. 1995

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“…These studies imply that synthetic FeS 2 NCs might present enhanced cathode performance, as observed with many other electrode materials. − To be compatible with the large-scale electrode fabrication processes, such as roll-to-roll deposition and inkjet printing, ,, colloidal NC solutions (NC inks) are highly desired . Similarly, FeS 2 NC inks for photovoltaics have also been a hot topic in recent years. ,,, …”

Section: Introductionmentioning

confidence: 92%

“…4 Similarly, FeS 2 NC inks for photovoltaics have also been a hot topic in recent years. 20,23,29,30 Table 1 summarizes the representative publications of three wet-chemistry methods that hold promise for synthesizing FeS 2 NC inks: (1) hot injection (injecting one or all precursors into a preheated flask under a water-free and air-free environment); 7,8,31−43 (2) microwave (heating the reaction flask with microwave power); 4,44−46 and (3) solvothermal (heating a sealed autoclave vessel in a furnace or oven). 47−53 The key findings in these studies are as follows: (1) the most important factors for controlling the phase purity are precursor identities, molar ratios between Fe and S, reaction temperatures, solvents, and ligands; 4,7,8,31−53 (2) the morphological evolution is further affected by reaction duractions and concentrations of reactants, in addition to the factors above; 8,43,51 (3) the NC formation is governed by both thermodynamics and kinetics; 41,43 and (4) H 2 S seems to be a critical intermediate of the S precursor.…”

Section: ■ Introductionmentioning

confidence: 99%

Iron Pyrite Nanocrystal Inks: Solvothermal Synthesis, Digestive Ripening, and Reaction Mechanism

et al. 2014

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Colloidal iron pyrite nanocrystals (or FeS 2 NC inks) are desirable as active materials in lithium ion batteries and photovoltaics and are particularly suitable for large-scale, roll-to-roll deposition or inkjet printing. However, to date, FeS 2 NC inks have only been synthesized using the hot-injection technique, which requires air-free conditions and may not be desirable at an industrial scale. Here, we report the synthesis of monodisperse, colloidal, spherical, and phase-pure FeS 2 NCs of 5.5 ± 0.3 nm in diameter via a scalable solvothermal method using iron diethyldithiocarbamate as the precursor, combined with a postdigestive ripening process. The phase purity and crystallinity are determined using X-ray diffraction, transmission electron microscopy, farinfrared spectroscopy, and Raman spectroscopy techniques. Through this study, a hypothesis has been verified that solvothermal syntheses can also produce FeS 2 NC inks by incorporating three experimental conditions: high solubility of the precursor, efficient mass transport, and sufficient stabilizing ligands. The addition of ligands and stirring decrease the NC size and led to a narrow size distribution. Moreover, using density functional theory calculations, we have identified an acid-mediated decomposition of the precursor as the initial and critical step in the synthesis of FeS 2 from iron diethyldithiocarbamate.

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“…The diverse electric and magnetic properties and their interplay in pyrite type compounds have attracted much interest. In particular, the structural, optical, electronic and other properties of natural iron pyrite have been investigated by solidstate physicists and chemists for many years (Sato, 1985;Birkholz, 1992;Antonijevic et al, 2002). More recently, owing to their excellent light absorbing and electronic properties, the pyrite compounds have attracted an enormous amount of research attention in the field of photovoltaic materials (Schlegel & Wachter, 1976;Schieck et al, 1990), and the possible relation of the physical properties to chemical composition has been investigated by several authors (Ferrer & Sá nchez, 1992;Echarri & Sá nchez, 1974).…”

Section: Pyrite Mineralmentioning

confidence: 99%

Full-pattern analysis of time-of-flight neutron transmission of mosaic crystals

Malamud

Santisteban

2016

J Appl Cryst

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The energy-resolved neutron transmission of mosaic crystals contains a series of dips in intensity, at specific neutron wavelengths defined by the orientation of the specimen in the neutron beam. This article presents a Rietveld type fullpattern analysis of neutron transmission experiments on mosaic crystals performed at spallation pulsed neutron sources. The proposed analysis provides precise and simple determination of lattice parameters, mosaicity, extinction factors and crystal orientation, and is especially suited to investigate the spatial variation of such microstructural information across macroscopic specimens with $1 mm resolution. The effect of extinction on the intensity of Bragg reflections has been successfully accounted for by a parameter measuring the ratio of the beam attenuation due to Bragg reflection to the combined attenuation due to absorption and scattering processes. Experiments were performed at the ENGIN-X beamline, ISIS Facility, UK, on several naturally occurring and man-made mosaic crystals, including a copper monochromator at temperatures between 55 and 300 K, an iron-nickel meteorite, and a natural pyrite crystal. Typical experimental resolutions found for lattice parameters and mosaicity are 0.03 and 7%, respectively. The possibilities of the technique for quantitative phase and/or texture analysis of specimens composed of several grains or phases are discussed.

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Pyrite type compounds — With particular reference to optical characterization

Cited by 49 publications

References 78 publications

X-ray absorption near-edge spectra of transition metal disulfides FeS2 (pyrite and marcasite), CoS2, NiS2 and CuS2, and their isomorphs FeAsS and CoAsS

X-ray absorption near-edge spectra of transition metal disulfides FeS2 (pyrite and marcasite), CoS2, NiS2 and CuS2, and their isomorphs FeAsS and CoAsS

Iron Pyrite Nanocrystal Inks: Solvothermal Synthesis, Digestive Ripening, and Reaction Mechanism

Full-pattern analysis of time-of-flight neutron transmission of mosaic crystals

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