The energies of combustion of high-purity samples of lanthanum, praseodymium, neodymium, gadolinium, dysprosium, holmium, and erbium in fluorine to form the respective trifluorides were measured in a bomb calorimeter. The results obtained for the standard enthalpies of formation, ΔHfo(298.15 K)...
Using the most recent crystallographic data, the Born-Landé equation was employed to calculate lattice energies of the rare-eath trifluorides. The excellent agreement (
The energy of formation of samarium trifluoride was measured by direct fluorination of samarium metal in a bomb calorimeter. The following values were determined: the standard enthalpy of formation {ΔHfo(SmF3, c, 298.15 K)} = −(398.9 ± 1.1) kcalth mol−1 and the standard Gibbs free energy of fo...
The magnetic property in neodymium gallium garnet (NdGaG) is studied by the quantum theory. The ground configuration split states are calculated taking into account the spin–orbit interaction and crystal field effect. Taking account of the Nd–Nd exchange interaction, a good agreement between e...
The electrochemical behaviour of the Nd(III)/Nd(0) system has been investigated in several molten media and more particularly in LiF–CaF2. A preliminary study based both on thermodynamic and experimental data showed that it is not possible to observe the Nd(III)/Nd(0) system in LiF–KF and LiF–...
A fluorine-19 NMR study of single crystals of NdF3 and PrF3 is reported. The shift tensors are determined, at 97 K for NdF3 and 103 K for PrF3, for the three types of fluorine in the trigonal unit cell. Point-dipole interaction accounts for only 45% of the traceless part of the shift tensors, th...
An abnormal phenomenon is experimentally found that the saturation magnetization in NdF3 drops with decreasing temperatures in high magnetic fields by Guillot. In this paper, by studying the magnetic and magneto-optical properties, a thorough explanation is presented by a two-sublattice model. O...
The energy of formation of neodymium trifluoride was measured by direct fluorination of neodymium metal in a bomb calorimeter. From the experimental results the following values were determined: the standard enthalpy of formation ΔHfo(NdF3, c, 298.15 K) = −(1660.6 ± 4.9) kJ mol−1, and the stan...
High concentrations of fluoride in drinking water can cause the disease fluorosis. Our scope goal is to develop an effective biopolymeric adsorbent for the removal of fluoride to below a specific safety limit set by the World Health Organization. In this study, the natural adsorbent material cel...
Various health problems associated with drinking water containing high fluoride levels, have motivated researchers to develop more efficient adsorbents to remove fluoride from water for beneficial concentrations to human health. The objective of this research was to anchor lanthanum oxyhydroxide...
Slow highly charged ions (HCI) were utilized successfully for the formation of various nanostructures in the surfaces of different materials. The creation mechanism of HCI-induced nanostructures was intensively studied in alkali- and alkaline-earth fluorides. Here, we are investigating another t...
In the present work, novel lanthanum‑iron binary oxide nanoparticles are used as adsorbents for fluoride removal from aqueous solution and oxygen gas sensor. The lanthanum‑iron binary oxide nanoparticles were synthesized using co-precipitation method and sintered at a temperature of 100 °C, 450...
The objective of this study was to determine the influence of different operational variables on fluoride (F−) removal from waters using lanthanum (La)-doped silica xerogels and the mechanisms involved in this process. Accordingly, four xerogels were synthesized, one acting as blank (X-B), two d...
The frequent occurrence of algae boom and skeletal fluorosis has drawn global attention to developing feasible technologies for phosphate and fluoride removal from water bodies. This study reported the synthesis of novel three-dimensional rice-like [email protected] nanocomposites by anchoring L...
Separation of some active metal ions such as Ce3+, Eu3+, and La3+ from molten fluoride salt using electrochemical process is difficult. The currently available electrodeposition process assisted by the solid reactive electrode or liquid metal electrode faces challenges such as the isolation of t...
Reaction of various carbonyl compounds with xenon difluoride in the presence of silicon tetrafluoride was investigated. Aromatic aldehyde, ketones, and α-ketoester react with xenon difluoride to give α,α-difluoroalkyl phenyl ethers. However, acid fluoride, ester, acid cyanide, α-ketocarboxyl...
Reactions of alkylhypochlorites and xenon difluoride with cyclohexene give primarily 1-chloro-2-fluorocyclohexanes via formation of a complex between xenon difluoride and the alkylhypochlorite.
Xenon difluoride (XeF2) plasma treatment of a series of polymers containing different repeat units gives rise to varying levels of surface fluorination. Alkene and aromatic C–H bonds appear to be more susceptible towards reaction compared to their sp3 counterparts. The extent of fluorine incorp...
The reaction of xenon difluoride with chloroform in PTFE–FEP, Pyrex and quartz tubes has been studied using 19F and 13C NMR spectroscopy. The detection of CCl4 as a transient product suggests a mechanism that can lead to trichloromethyl radicals. A mechanism postulating formation of the hyperva...
The xenon difluoride-mediated, ipso-amidation of boronic acids has been achieved for the first time under mild conditions. This method provides a simple, one-pot procedure for the direct synthesis of a series of anilides from the corresponding arylboronic acids and alkyl/aryl nitriles. Arylboron...
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