Journal ArticleDOI
X-ray photoelectron spectroscopy study on YbFe2As2 crystals prepared by different growth temperatures
TLDR
In this article, a double-step solid-state reaction method was used to synthesize polycrystalline samples of YbFe2As2 by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive Xray analysis (EDAX), and Xray photoelectron spectroscopy (XPS).Abstract:
Polycrystalline samples of YbFe2As2 were synthesized by double step solid-state reaction method. Two different samples were grown at the temperatures of 900 and 1200 °C. The synthesized YbFe2As2 polycrystalline samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX) and X-ray photoelectron spectroscopy (XPS). SEM images revealed that the YbFe2As2 compound was formed as polycrystalline with typical sizes of granules ranging from 5 to 10 μm. The Rietveld refinement of the XRD data of YbFe2As2 crystals was performed to understand the structural phase. The oxygen adsorption in to the surface of YbFe2As2 crystals was studied by means of XPS analysis. A possible explanation was given for the synthesis temperature dependent oxygen adsorption in to the YbFe2As2 based on the results of XPS, EDAX and resistance versus temperature measurements.read more
Citations
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Effective Enrichment of Low-Concentration Rare-Earth Ions by Three-Dimensional Thiostannate K2Sn2S5.
TL;DR: In this paper, a thiostannate possessing a three-dimensional porous framework, K2Sn2S5 (KTS-2), was chosen as an ion exchange material for capturing rare-earth elements (REEs) from an aqueous solution.
Posted Content
Aging effect in Magnetotransport Property of Oxygen adsorbed BaFe2As2
Nilotpal Ghosh,Santhosh Raj +1 more
TL;DR: In this paper, the presence of oxygen on the surfaces of flux grown BaFe2As2 single crystals which were kept in air ambience for several months was found by Energy Dispersive X-ray Analysis (EDAX).
High Pressure Study on Fe-Pnictide Superconductors
TL;DR: A review of high pressure studies on Fe-pnictide superconductors is given in this article, where pressure effects on the magnetic and superconducting transitions are discussed for different classes of doped and undoped FeAs-compounds.
Journal ArticleDOI
Evidence of strong correlation and magnetotransport scaling in YbFe2As2
TL;DR: In this article , the scaling analysis of magnetoresistance has been carried out and the verification of Kohler's rule has been explored in YbFe 2 As 2 crystal is found that satisfies an unusual scaling relationship between applied magnetic field and temperature within limited temperature range.
References
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Journal ArticleDOI
Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials
Toru Yamashita,Peter C. Hayes +1 more
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Journal ArticleDOI
Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems
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Journal ArticleDOI
Superconductivity at 43 K in an iron-based layered compound LaO 1-x F x FeAs
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Journal ArticleDOI
Spin-density-wave anomaly at 140 K in the ternary iron arsenide BaFe 2 As 2
TL;DR: The ternary iron arsenide (BaFe) is a poor Pauli-paramagnetic metal and undergoes a structural and magnetic phase transition at 140 K, accompanied by strong anomalies in the specific heat, electrical resistance, and magnetic susceptibility.
Journal ArticleDOI
Use of XPS in the determination of chemical environment and oxidation state of iron and sulfur samples: constitution of a data basis in binding energies for Fe and S reference compounds and applications to the evidence of surface species of an oxidized pyrite in a carbonate medium
TL;DR: In this article, the XPS coherent binding energy (BE) data basis for reference compounds that are representative of oxidation products formed onto the pyrite reactive surface was presented, and the data in BEs obtained from reference compounds have been exploited to show the surface species of an oxidized pyritic in a HCO3−2 M medium.
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