scholarly journals Insight into the Crystal Structures and Physical Properties of the Uranium Borides UB1.78±0.02, UB3.61±0.041 and UB11.19±0.13

Minerals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 29
Author(s):  
Laura Martel ◽  
Thibault Charpentier ◽  
Pedro Amador Cedran ◽  
Chris Selfslag ◽  
Mohamed Naji ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
Solid State Nmr ◽  
Nmr Spectra ◽  
Squid Magnetometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
5F Electrons ◽  
Insight Into

In this study we reported the synthesis of three polycrystalline uranium borides UB1.78±0.02, UB3.61±0.041, and UB11.19±0.13 and their analyses using chemical analysis, X-ray diffraction, SQUID magnetometry, solid-state NMR, and Fourier transformed infrared spectroscopy. We discuss the effects of stoichiometry deviations on the lattice parameters and magnetic properties. We also provide their static and MAS-NMR spectra showing the effects of the 5f-electrons on the 11B shifts. Finally, the FTIR measurements showed the presence of a local disorder.

A Mn(II) coordination polymer from a polycarboxylate-containing ligand: synthesis, structural characterization, and properties

2017 ◽  
Vol 72 (12) ◽  
pp. 937-940 ◽  
Author(s):  
Xiao-Hong Zhu ◽  
Xiao-Chun Cheng ◽  
Yun-Hua Qian
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
Coordination Polymer ◽  
Single Crystal ◽  
Structural Characterization ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Thermogravimetric Analyses ◽  
X Ray ◽  
3D Framework

AbstractThe neutral, four-fold protonated pyridine-3,5-dicarbox(3,5-dicarboxylatoanilide) (H4L) reacts with Mn(II) salts under hydrothermal conditions to yield a new complex: [Mn2(L)(H2O)2]·H2O (1), which has been characterized by single crystal X-ray diffraction, infrared spectroscopy, and elemental and thermogravimetric analyses. Complex 1 exhibits a binodal (4,8)-connected 3D framework with flu (412.612.84)(46)2 topology. The magnetic properties of 1 were investigated.

Multinuclear NMR and Powder X-ray Diffraction Studies of Si and Sn Clathrates of Alkali Metals: Vacancies, Disorder and Knight Shifts

2001 ◽  
Vol 691 ◽  
Author(s):  
Michael J. Ferguson ◽  
Igor L. Moudrakovski ◽  
Christopher I. Ratcliffe ◽  
John S. Tse
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Spectra ◽  
Alkali Metals ◽  
Rietveld Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multinuclear Nmr ◽  
Binary Metal ◽  
Knight Shifts

ABSTRACTThe Structure I type binary metal clathrates of K/Si, Rb/Si and Cs/Sn have been synthesised and studied by powder X-ray diffraction and solid state NMR. Rietveld analysis shows that in all three materials some of the cages are empty, and that in the Cs/Sn clathrate there are vacancies in the Sn framework. The NMR results yield Knight shifts for 29Si and 39K and confirm that the Cs/Sn clathrate is not conducting. Many of the features of the NMR spectra can be understood in terms of the distributions of atom vacancies.

Preparation of LaFeO3 particles by sol-gel technology

1998 ◽  
Vol 13 (2) ◽  
pp. 451-456 ◽  
Author(s):  
C. Vázquez-Vázquez ◽  
P. Kögerler ◽  
M. A. López-Quintela ◽  
R. D. Sánchez ◽  
J. Rivas
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
Sol Gel ◽  
Diffraction Peak ◽  
Gel Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ferromagnetic Component ◽  
Peak Broadening

The study of submicroscopic particles in already known systems has resulted in a renewed interest due to the large differences found in their properties when the particle size is reduced, and because of possible new technological applications. In this work we report the preparation of LaFeO3 particles by the sol-gel route, starting from a solution of the corresponding metallic nitrates and using urea as gelificant agent. Gels were decomposed at 200 °C and calcined 3 h at several temperatures, T, in the range 250–1000 °C. The samples were structurally characterized by x-ray diffraction (XRD) showing that the orthoferrite crystallizes at T as low as 315 °C. From the x-ray diffraction peak broadening, the particle size was determined. The size increases from 60 to 300 nm as the calcination T increases. Infrared spectroscopy was used to characterize gels and calcined samples. From these studies a mechanism for the gel formation is proposed. Study of the magnetic properties of LaFeO3 particles shows the presence of a ferromagnetic component which diminishes as the calcination temperature increases, vanishing at T = 1000 °C.

scholarly journals Synthesis and Characterization of a New Aluminum-Doped Bismuth Subcarbonate

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 466
Author(s):  
Loisangela Álvarez ◽  
Blanca Rojas de Gascue ◽  
Rolando J. Tremont ◽  
Edgar Márquez ◽  
Euclides J. Velazco
Keyword(s):  
Infrared Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Energy Dispersive ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Characterization Methods ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Anionic Part

A new compound, Bi2O2CO3:Al, was synthesized by the coprecipitation method. The characterization was done by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), electronic scanning microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The characterization methods allowed to identify the Bi2O2CO3:Al compound, such as the Al-doped Bi2O2CO3 by XRD, the anionic part (CO32−) by FTIR, and the presence of aluminum in the compound by XPS and EDX. It was confirmed to have a nanostructure like a nanosheet and a microstructure that resembles a type sponge by SEM.

Interactions de l'ion Ag+ avec la glutarimide

1984 ◽  
Vol 62 (7) ◽  
pp. 1287-1291 ◽  
Author(s):  
Johanne Perron ◽  
André L. Beauchamp
Keyword(s):  
Infrared Spectroscopy ◽  
Infrared Spectrum ◽  
Nmr Spectra ◽  
The Other ◽  
Mirror Plane ◽  
Bond Orders ◽  
X Ray Diffraction ◽  
Complex Species ◽  
X Ray ◽  
C Nmr

The 1:1 complex formed between Ag+ ions and glutarimide was investigated by X-ray diffraction, infrared spectroscopy, and 1H and 13C nmr. The crystals are monoclinic, C2/c, a = 13.497(3) Å, b = 9.503(2) Å, c = 9.600(4) Å, β = 92.30(3)°, Z = 4 molecules per cell. The structure was refined on 1086 nonzero [Formula: see text] reflections to R = 0.027. One half of the Ag atoms are linearly coordinated to the N atoms of two deprotonated glutarimide ligands, whereas the other half are surrounded by an approximate tetrahedron of four carbonyl oxygens belonging to two adjacent [Glu–Ag–Glu]− units. The [Glu–Ag–Glu]− groups are joined by tetrahedrally coordinated Ag atoms into infinite chains along the c axis. Complexation introduces a number of changes in the infrared spectrum of glutarimide. They can be related to the disappearance of the N—H vibrator and the change of bond orders in the —C(O)—N—C(O)— portion of the ligand. The nmr spectra show that coordinated glutarimide retains a mirror plane when the Ag complex is dissolved in DMSO. This suggests that the O-bonded Ag atoms dissociate to a large extent in solution, leaving the linear [Glu–Ag–Glu]− ions as the major glutarimide complex species.

Three 3d–4f Tetranuclear Complexes Based on 2,3,5-Trichlorobenzoic Acid: Syntheses, Structures, and Magnetic Properties

2016 ◽  
Vol 69 (4) ◽  
pp. 446 ◽  
Author(s):  
Yu Zhang ◽  
Ji-Min Zheng
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
Hydrogen Bonds ◽  
Metal Ions ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Triclinic Space Group ◽  
X Ray ◽  
Ferromagnetic Interactions ◽  
Tetranuclear Complexes

The solvothermal reactions of 2,3,5-trichlorobenzoic acid (HL) 2,2′-bipyridine (bipy), CoCl2·6H2O, and Ln2O3 afforded three novel 3d–4f tetranuclear complexes Co2Ln2(L)10(bipy)2 (Ln = Dy 1, Ho 2, and Er 3), which have been characterized by single-crystal X-ray diffraction, infrared spectroscopy, and element analyses. Complexes 1–3 crystallize in the triclinic space group P1, and the completely deprotonated L ligands possess μ2 : η2, η1 and μ2 : η1, η1 coordination modes to bridge adjacent metal ions, which further connect into 2D layers by hydrogen bonds. Magnetic studies indicate ferromagnetic interactions between adjacent metal ions in complexes 1 and 3.

scholarly journals Order in disorder: solution and solid-state studies of [MIII2MII5] wheels (MIII = Cr, Al; MII = Ni, Zn)

2018 ◽  
Vol 47 (34) ◽  
pp. 11834-11842 ◽  
Author(s):  
Hector W. L. Fraser ◽  
Gary S. Nichol ◽  
Dušan Uhrín ◽  
Ulla Gro Nielsen ◽  
Marco Evangelisti ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Single Crystal ◽  
Solid State Nmr ◽  
Squid Magnetometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid State Nmr Spectroscopy ◽  
Esi Mass Spectrometry

Heterometallic species with Anderson-like structures are characterised by single-crystal X-ray diffraction, solution- and solid-state NMR spectroscopy, ESI mass spectrometry and SQUID magnetometry.

scholarly journals Correlation between morphology and magnetic properties of electrochemically produced cobalt powder particles

2015 ◽  
Vol 80 (2) ◽  
pp. 197-207 ◽  
Author(s):  
Vesna Maksimovic ◽  
Nebojsa Nikolic ◽  
Vladan Kusigerski ◽  
Jovan Blanusa
Keyword(s):  
Magnetic Properties ◽  
Cobalt Powder ◽  
Squid Magnetometry ◽  
Parallel Reaction ◽  
X Ray Diffraction ◽  
Applied Current ◽  
X Ray ◽  
Eds Analysis ◽  
Powder Particles ◽  
Current Densities

Cobalt 3D powder particles were successfully prepared by the galvanostatic electrodeposition. Electrodeposited cobalt powder were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive Spectroscopy (EDS) analysis and SQUID magnetometry. It has been shown that morphology, structure and magnetic properties of cobalt particles are closely associated and can be easily controlled by adjusting process parameters of electrodeposition. Morphology of cobalt powder particles is strongly affected by hydrogen evolution reaction as a parallel reaction to cobalt electrodeposition. Depending on the applied current density, the two types of powder particles were formed: dendrites at lower and spongy-like particles at higher current densities. Morphologies and structures of powder particles are correlated with their magnetic properties, and compared with those of the bulk cobalt. In comparison with the properties of bulk cobalt, the obtained 3D structures exhibited a decreased saturation magnetization (MS), but an enhanced coercivity (HC) which is explained by their peculiar morphology.

Synthesis, crystal structure, and magnetic properties of the complex [(CH3)3NH]2 [Co(NCS)4]

2018 ◽  
Vol 73 (8) ◽  
pp. 571-575
Author(s):  
Yang Jie ◽  
Huang Yuan ◽  
Zhong YouQuan ◽  
Fang Ting ◽  
Hao Fan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Infrared Spectroscopy ◽  
Magnetic Measurements ◽  
X Ray Diffraction ◽  
Magnetic Susceptibility Data ◽  
X Ray ◽  
Susceptibility Data ◽  
Ferromagnetic Interactions

AbstractA new complex [(CH3)3NH]2[Co(NCS)4], in which zero-dimensional [Co(NCS)4]n2− anions are balanced by 2n [(CH3)3NH]+ cations, was synthesized. The complex has been characterized by single X-ray diffraction, infrared spectroscopy, elemental analysis, and magnetic measurements. Magnetic susceptibility data indicate ferromagnetic interactions among the CoII ions.

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