Identifying a perovskite phase in rare-earth nickelates using X-ray photoelectron spectroscopy

Over the past few years, the photogenic fabrication of metal oxide nanoparticles has attracted considerable attention, owing to the simple, eco-friendly, and non-toxic procedure. Herein, we fabricated NiO nanoparticles and altered their optical properties by doping with a rare earth element (lanthanum) using Sesbania grandiflora broth for antibacterial applications. The doping of lanthanum with NiO was systematically studied. The optical properties of the prepared nanomaterials were investigated through UV-Vis diffuse reflectance spectra (UV-DRS) analysis, and their structures were studied using X-ray diffraction analysis. The morphological features of the prepared nanomaterials were examined by scanning electron microscopy and transmission electron microscopy, their elemental structure was analyzed by energy-dispersive X-ray spectral analysis, and their oxidation states were analyzed by X-ray photoelectron spectroscopy. Furthermore, the antibacterial action of NiO and La-doped NiO nanoparticles was studied by the zone of inhibition method for Gram-negative and Gram-positive bacterial strains such as Escherichia coli and Bacillus sublitis. It was evident from the obtained results that the optimized compound NiOLa-04 performed better than the other prepared compounds. To the best of our knowledge, this is the first report on the phytosynthetic fabrication of rare-earth ion Lanthanum (La3+)-doped Nickel Oxide (NiO) nanoparticles and their anti-microbial studies.

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Effect of calcination temperature on rare earth tailing catalysts for catalytic methane combustion

Green Processing and Synthesis ◽

10.1515/gps-2020-0053 ◽

2020 ◽

Vol 9 (1) ◽

pp. 734-743

Author(s):

Ran Zhao ◽

ZiChen Tian ◽

Zengwu Zhao

Keyword(s):

Rare Earth ◽

Mine Tailings ◽

Photoelectron Spectroscopy ◽

Methane Combustion ◽

Space Velocity ◽

High Catalytic Activity ◽

Reduction Peak ◽

X Ray ◽

Different Temperatures ◽

Bayan Obo

AbstractBayan Obo tailings are rich in rare earth elements (REEs), iron, and other catalytic active substances. In this study, mine tailings were calcined at different temperatures and tested for the catalytic combustion of low-concentration methane. Upon calcination at 600°C, high catalytic activity was revealed, with 50% CH4 conversion at 587°C (space velocity of 12,000 mL/g h). The physicochemical properties of catalysts were characterized using thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, hydrogen temperature-programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS). Compared to the raw ore sample, the diffraction peak intensity of Fe2O3 increased post calcination, whereas that of CeCO3F decreased. A porous structure appeared after the catalyst was calcined at 600°C. Additionally, Fe, Ce, Ti, and other metal elements were more highly dispersed on the catalyst surface. H2-TPR results revealed a broadening of the reduction temperature range for the catalyst calcined at 600°C and an increase in the reduction peak. XPS analysis indicated the presence of Ce in the form of Ce3+ and Ce4+ oxidation states and the coexistence of Fe in the form of Fe2+ and Fe3+. Moreover, XPS revealed a higher surface Oads/Olatt ratio. This study provides evidence for the green reuse of Bayan Obo mine tailings in secondary resources.

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Synthesis of new Ln4(Al2O6F2)O2 (Ln = Sm, Eu, Gd) phases with a cuspidine-related structure

IUCrJ ◽

10.1107/s205225251801744x ◽

2019 ◽

Vol 6 (1) ◽

pp. 128-135 ◽

Cited By ~ 1

Author(s):

Aroa Morán-Ruiz ◽

Aritza Wain-Martin ◽

Alodia Orera ◽

María Luisa Sanjuán ◽

Aitor Larrañaga ◽

...

Keyword(s):

Rare Earth ◽

Low Temperature ◽

Raman Spectra ◽

Photoelectron Spectroscopy ◽

Binding Energies ◽

Temperature Reaction ◽

Rietveld Refinements ◽

X Ray ◽

Vinylidene Difluoride ◽

Vacant Position

The first fluorination of the cuspidine-related phases of Ln4(Al2O7□)O2 (where Ln = Sm, Eu, Gd) is reported. A low-temperature reaction with poly(vinylidene difluoride) lead to the fluorine being substituted in place of oxygen and inserted into the vacant position between the dialuminate groups. X-ray photoelectron spectroscopy shows the presence of the F 1s photoelectron together with an increase in Al 2p and rare-earth 4d binding energies supporting F incorporation. Energy-dispersive X-ray spectroscopy analyses are consistent with the formula Ln4(Al2O6F2)O2, confirming that substitution of one oxygen by two fluoride atoms has been achieved. Rietveld refinements show an expansion in the cell upon fluorination and confirm that the incorporation of fluoride in the Ln4(Al2O7□)O2 structure results in changes in Al coordination from four to five. Thus, the isolated tetrahedral dialuminate Al2O7 groups are converted to chains of distorted square-based pyramids. These structural results are also discussed based on Raman spectra.

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X-ray Photoelectron Spectroscopy of Rare-Earth Doped Triglycine Sulphate

Ferroelectrics Letters Section ◽

10.1080/713931704 ◽

2003 ◽

Vol 30 (1-2) ◽

pp. 13-24 ◽

Cited By ~ 1

Author(s):

Emilia Mihaylova ◽

Anna Aladjadjiyan

Keyword(s):

Rare Earth ◽

Photoelectron Spectroscopy ◽

Triglycine Sulphate ◽

X Ray ◽

Rare Earth Doped

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Electronic structure of SmB6 and related rare-earth borides by x-ray photoelectron spectroscopy

Physica B+C ◽

10.1016/0378-4363(77)90299-6 ◽

1977 ◽

Vol 86-88 ◽

pp. 237-238 ◽

Cited By ~ 3

Author(s):

J.-N. Chazalviel ◽

M. Campagna ◽

G.K. Wertheim ◽

P.H. Schmidt ◽

L.D. Longinotti

Keyword(s):

Electronic Structure ◽

Rare Earth ◽

Photoelectron Spectroscopy ◽

X Ray

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Single Crystal Rare-earth Scandate Perovskites Analyzed Using X-ray Photoelectron Spectroscopy: 3. GdScO3(110)

Surface Science Spectra ◽

10.1116/11.20140908 ◽

2014 ◽

Vol 21 (1) ◽

pp. 149-156 ◽

Cited By ~ 1

Author(s):

Richard T. Haasch ◽

Lane W. Martin ◽

Eric Breckenfeld

Keyword(s):

Rare Earth ◽

Single Crystal ◽

Photoelectron Spectroscopy ◽

X Ray

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Single Crystal Rare-earth Scandate Perovskites Analyzed Using X-ray Photoelectron Spectroscopy: 1. PrScO3(110)

Surface Science Spectra ◽

10.1116/11.20140906 ◽

2014 ◽

Vol 21 (1) ◽

pp. 131-139

Author(s):

Richard T. Haasch ◽

Lane W. Martin ◽

Eric Breckenfeld

Keyword(s):

Rare Earth ◽

Single Crystal ◽

Photoelectron Spectroscopy ◽

X Ray

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Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium

Gels ◽

10.3390/gels7040195 ◽

2021 ◽

Vol 7 (4) ◽

pp. 195

Author(s):

Snežana S. S. Nenadović ◽

Ljiljana M. Kljajević ◽

Marija M. Ivanović ◽

Miljana M. Mirković ◽

Nadežda Radmilović ◽

...

Keyword(s):

Rare Earth ◽

Photoelectron Spectroscopy ◽

Chemical Properties ◽

Alkali Activation ◽

Tetrahedral Coordination ◽

X Ray Diffraction ◽

Tem Analysis ◽

X Ray ◽

Transmission Electron ◽

Na Ions

The present work was focused on doping of 1% and 5% both of Nd2O3 and Sm2O3 in geopolymer gels. One of the main goals was to determine the influence of the behavior of Nd and Sm as dopants and structural nanoparticles changes of the final geopolymer formed. It is shown that the disorder formed by alkali activation of metakaolin can accommodate the rare earth cations Nd3+ and Sm3+ into their aluminosilicate framework structure. The main geopolymerization product identified in gels is Al-rich (Na)-AS-H gel comprising Al and Si in tetrahedral coordination. Na+ ions were balancing the negative charge resulting from Al3+ in tetrahedral coordination. The changes in the structures of the final product (geopolymer/Nd2O3; Sm2O3), has been characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) analysis with energy dispersive spectrometry (EDS). Nucleation at the seed surfaces leads to the formation of phase-separated gels from rare earth phase early in the reaction process. It is confirmed that Nd and Sm have been shown to form unstable hydroxides Nd(OH)3 and Sm(OH)3 that are in equilibrium with the corresponding oxides.

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Improvement of Dispersibility of Graphene Oxide by Surface Modification with Rare Earths

10.21203/rs.3.rs-1206615/v1 ◽

2022 ◽

Author(s):

Yong Li ◽

Zhou Jiang ◽

Haidong Yu ◽

Xuebin Zhou ◽

Peng Yi

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Rare Earth ◽

Rare Earth Elements ◽

Photoelectron Spectroscopy ◽

Energy Dispersive Spectrometer ◽

X Ray ◽

Modified Graphene Oxide ◽

Modified Graphene ◽

The Rare Earth

Abstract Rare earth-modified graphene oxide (RE-M-GO) materials were successfully prepared by infiltration and heating modifier method. The morphology and phase structure of RE-M-GO were characterized by scanning electron microscopy(SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy dispersive spectrometer(EDS). The changes of the chemical structure were indicated by Fourier transform infrared (FTIR). X-ray photoelectron spectroscopy(XPS) was used to study the chemical state of the surface elements of graphene oxide which showed that the rare earth elements were added to the graphene oxide functional groups through the coordination reaction. Additionally, the findings concluded that the effect of modification by Ce is more obvious than La elements and the RE-M-GO materials prepared by the heating modifier method had better dispersibility than infiltration. With activating effect, the rare earth elements grafting to graphene oxide will contribute to its combination with other materials.

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