We have conducted a spectroscopic investigation of Pr3+ in barium yttrium fluoride (BaY2O8). Two doping concentrations were used: BaY2F8:Pr3+ (0.3%) and BaY2F8:Pr3+ (1%). The measurements included absorption, luminescence under continuous and pulsed excitations, and thermal effects on some sharp...

In order to understand the erosion behavior of oxide ceramics during their exposure to fluorocarbon plasma, the thin films of AlF3, YF3, Al2O3, Y2O3 and SiO2 were deposited on silicon and then their surfaces were irradiated with Ar ions of different kinetic energies. When we measured the relativ...

Hexagonal yttrium hydroxide fluoride microcrystals were prepared by a two-step hydrothermal route using yttrium nitrate, sodium hydroxide and sodium fluoride as raw materials to react in propanetriol solvent. The samples were characterized by powder X-ray diffraction (XRD), energy dispersive spe...

3D macrostructure adsorbents have attracted great attention in water treatment recently. A series of novel 3D yttrium-based graphene oxide-sodium alginate hydrogels were prepared by sol-gel process for removal of fluoride. The hydrogels displayed a 3D network porous and amorphous structure compo...

This article presents the fabrication of hexagonal yttrium hydroxide fluoride nanobundles via one-pot hydrothermal process, using yttrium nitrate, sodium hydroxide and ammonia fluoride as raw materials to react in propanetriol solvent. The X-ray diffraction pattern clearly reveals that the grown...

Cubic and hexagonal sodium yttrium fluoride were successfully synthesized from yttrium nitrate, sodium fluoride and polyethanediol in propanetriol solvent under a facile hydrothermal route. By regulating the molar ratio of yttrium and fluoride, hydrothermal temperature and reaction time, the pha...

In this study, a laminated nanocomposite of Y-Zr-Al with significantly high surface area of 256.6 m2/g was successfully prepared, and was used to investigate the defluoridation performance of sorbent based on Yttrium. The composite showed high fluoride sorption performance, especially at low F− ...

Yttrium fluoride films were grown on silicon wafers by magnetron sputtering at different substrate temperatures (ST). The composition, structure and optical properties have been investigated systematically. X-ray photoelectron spectroscopy (XPS) analysis shows that the films mainly contain Y and...

In this study, pure and rare earth ions-doped yttrium hydroxide fluoride (Y(OH)2.02F0.98 denoted as YHF) were fabricated via an ion exchange route employing anion exchangeable lanthanide hydroxyanion as a sacrificial template. And the anion exchange materials Y2(OH)5Cl·1.5H2O (YHCl) are synthes...

Publisher SummaryThe primary aim of this review is to collect together information on the solution thermochemistry of the trihalides of the lanthanides1, yttrium, and scandium. There is a meager amount of published work relating to nonaqueous solvents, rather than more relating to aqueous soluti...

Sublimation pressures of ScF3, YF3 and LaF3 were measured by mass spectrometric and semi-microbalance studies via the Knudsen and Langmuir techniques. The mass spectrometric work established ScF3(g), YF3(g) and LaF3(g) as the major vapour species over their respective solid trifluorides. For ScF...

Publisher SummaryThis chapter discusses the history, abundance, distribution, and extraction of scandium, yttrium, lanthanum, and actinium. With the exception of actinium, which is found naturally only in traces of uranium ores, these elements are by no means rare though they were once thought t...

A convenient and facile one-pot synthesis of 5,6-dihydro-4H-[1,2,4]oxadiazine is described. Treatment of aziridin-1-yl-oximes with Scandium(III) triflate readily afforded 5,6-dihydro-4H-[1,2,4]oxadiazine in the presence of chlorotrimethylsilane.

The reaction of ScF3 with (C5H5)2Mg gives a mixture of (C5H5)3Sc and (η5-C5H5)2ScF, not pure (C5H5)3Sc as reported previously. The same mixture is obtained on treating ScF3 with C5H5Na in tetrahydrofuran. The two products can be separated since (η-C5H5)2ScF is soluble in toluene whereas (C5H5)...

ScF3 reacts with anhydrous hydrazine yielding ScF3·N2H4; upon heating the compound in inert atmosphere ScF3 is regained. With hydrazine hydrate N2H5Sc(OH)F3 is obtained with solid ScF3; it decomposes to ScF3 in two steps.

The vapor pressure of scandium trifluoride is measured using a calibrated Knudsen effusion mass spectrometer. The vapor pressure of ScF3 (s) between 1159 and 1411 K is log10P (atm) = {−(17774 ± 85)T} + (8.698 ± 0.068)The vaporization enthalpy and entropy are 81.3 ± 0.4 kcal mol−1 and 39.8 ± ...

The vaporization of promethium trifluoride has been studied by Knudsen effusion-mass spectrometry. The equilibrium vapor pressure of PmF3 over (Pr13Pm13Sm13)F3 was mea- sured relative to those of the other components (PrF3 and SnF3) over the temperature range of 1100–1280 °C. The vaporization ...

This work presents the electronic structure and optical properties of some rare earth trifluorides (RF3) coarsely covering a large range of rare-earths with R = La, Ce, Pr, Nd, Gd and Dy. Our theoretical investigations are based on the first principles, using the full potential linearized augmen...

The fluorescence line narrowing technique is used to study homogenous linewidths of several resonant transitions (1D2 ↔ 3H4) for the first time. At temperatures exceeding 10 K the linewidths can be fitted by the theory of phonon-induced relaxation. However the narrowest linewidth (10 MHz at 4.5 ...

X-band (∼9.6 GHz) electron paramagnetic resonance measurements were carried out on a Gd3+-doped praseodymium triacetate monohydrate, Pr(CH3COO)3·H2O, single crystal in the temperature range 4.2–295 K. The spin-Hamiltonian parameters were estimated at room, liquid-nitrogen and liquid-helium te...