Green separation of rare earth elements by valence-selective crystallization of MOFs

2019 ◽  
Vol 55 (99) ◽  
pp. 14902-14905 ◽  
Author(s):  
Pengfei Yang ◽  
Qixin Zhuang ◽  
Yongsheng Li ◽  
Jinlou Gu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Room Temperature ◽  
Selective Crystallization ◽  
Green Separation

A green valence-selective crystallization strategy of MOFs is developed for the precise separation of Ce element at room temperature.

Lattice Location and Luminescence Behavior of Rare Earth Elements Implanted in GaN

1997 ◽  
Vol 482 ◽  
Author(s):  
M. Dalmer ◽  
M. Restle ◽  
A. Stötzler ◽  
U. Vetter ◽  
H. Hofsäss ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Room Temperature ◽  
Lattice Location ◽  
Isochronal Annealing ◽  
Line Intensities ◽  
Order Of Magnitude ◽  
Photoluminescence Studies ◽  
Luminescence Behavior ◽  
Emission Channeling

AbstractSingle crystalline GaN-layers were implanted with radioactive 167Tm and 169yb ions, and their lattice sites were determined using the emission channeling technique. After the decay of 167Tm to 167Er, photoluminescence studies were performed. Upon room temperature implantation, rare earth atoms immediately occupy relaxed substitutional sites with an average relaxation of about 0.025 nm. Isochronal annealing treatments up to 800 °C and co-implantation of oxygen to a dose an order of magnitude greater than that of the Tm or Yb do not influence the rare earth lattice sites. A variety of different rare earth related luminescence lines are observed, and co-implantation of oxygen strongly changes the line intensities.

Formation and Stabilities of Free Bilirubin and Bilirubin Complexes with Transition and Rare-Earth Elements

1971 ◽  
Vol 17 (12) ◽  
pp. 1165-1170 ◽  
Author(s):  
Rance A Velapoldi ◽  
Oscar Menis
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Lanthanide Complexes ◽  
Room Temperature ◽  
Covalent Bonding ◽  
Experimental Conditions ◽  
Square Planar ◽  
Square Planar Complexes ◽  
The Stability ◽  
Complex Stabilities

Abstract We investigated complexes formed between bilirubin and transition or rare-earth elements, and their relative stabilities. Relative rates of complex formation were analogous to metalloporphyrin and metal complex stabilities, according to the Irving—Williams series. Transition metals that formed strong, square planar complexes caused rapid bilirubin degradation. Iron(II) was oxidized to iron(III) in the bilirubin complex. Of the lanthanide complexes, only samarium(III) showed covalent bonding tendencies. Comparative molar absorptivities were calculated for several of the metal— bilirubin complexes. The stability of bilirubin in several solvents and under various experimental conditions is reported. At room temperature, bilirubin photooxidizes to biliverdin on exposure to laboratory light.

scholarly journals OPTICAL DOPING OF NITRIDES BY ION IMPLANTATION

2001 ◽  
Vol 15 (28n29) ◽  
pp. 1281-1287 ◽  
Author(s):  
E. ALVES ◽  
K. LORENZ ◽  
R. VIANDEN ◽  
C. BOEMARE ◽  
M. J. SOARES ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Room Temperature ◽  
Lattice Site ◽  
Rutherford Backscattering Spectrometry ◽  
Complete Recovery ◽  
Nitrogen Atmosphere ◽  
Site Location ◽  
Damage Behavior ◽  
Recombination Processes

A series of rare earth elements (RE) were implanted in GaN epilayers to study the lattice site location and optical activity. Rutherford backscattering spectrometry in the channeling mode (RBS/C) was used to follow the damage behavior in the Ga sublattice and the site location of the RE. For all the implanted elements (Ce, Pr, Dy, Er, and Lu) the results indicate the complete substitutionality on Ga sites after rapid thermal annealing at 1000°C for 2 min. The only exception occurs for Eu, which occupies a Ga displaced site. Annealing at 1200°C in nitrogen atmosphere at a pressure of 1GPa is necessary to achieve the complete recovery of the damage in the samples. After annealing the recombination processes of the implanted samples were studied by above and below band gap excitation. For Er implanted samples besides the 1.54 μm emission green and red emissions are also observed. Red emissions from 5 D 0 → 7 F 2 and 3 P 0 → 3 F 2 transitions were found in Eu and Pr implanted samples even at room temperature.

scholarly journals Electro-optic properties of singly and doubly doped lithium niobate crystal by rare earth elements for optoelectronic and laser applications

2019 ◽  
Vol 85 (3) ◽  
pp. 30502 ◽  
Author(s):  
Nune Mkhitaryan ◽  
Jean Zaraket ◽  
Ninel Kokanyan ◽  
Edvard Kokanyan ◽  
Michel Aillerie
Keyword(s):  
Rare Earth ◽  
Lithium Niobate ◽  
Rare Earth Elements ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Laser Applications ◽  
Geometric Configurations ◽  
Electro Optic ◽  
Direct Technique ◽  
Nonlinear Devices

Congruent lithium niobate (LN) doped with rare-earth elements is a promising host for integrated optic combining the properties straightforwardly associated to the dopant with the good electro-optic (EO) properties. By direct technique based on interferometric optical arrangement at a wavelength of 633 nm and at room temperature, we have experimentally determined the figure of merit F = n3reff, (n is the refractive index and reff, the effective EO coefficient) and finally calculated the EO coefficients reff of the third-column of the unclamped EO tensor of three series of singly doped LN with Yb3+, Ho3+, Tm3+ and two series of doubly doped Er3+–Yb3+. It is found that in all the studied opto-geometric configurations, the unclamped figure of merit and consequently the corresponding EO coefficients are relatively constant in the considered dopant concentration range. As the figure of merit, F qualifies crystals for EO modulation and laser applications, all reported results confirm that the LN singly or doubly doped with rare-earth elements are very promising versatile candidates for several multifunctional nonlinear devices in optoelectronic and laser applications.

scholarly journals Room temperature photoluminescence of (RE)NiO3 (RE=La, Y, Er, Ho, Nd and La1-xYx)

Cerâmica ◽  
2007 ◽  
Vol 53 (326) ◽  
pp. 165-168
Author(s):  
Z. R. Silva ◽  
D. M. A. Melo ◽  
A. C. Lima ◽  
E. Longo ◽  
M. A. F. Melo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Room Temperature ◽  
Emission Spectra ◽  
Polymeric Precursor ◽  
Room Temperature Photoluminescence ◽  
Structural Order ◽  
Visible Photoluminescence ◽  
Band Emission

The nature of visible photoluminescence (PL) at room temperature in amorphous (RE)NiO3 (RE=La, Y, Er, Ho, Nd and La1-xYx) is discussed. Powders of this system were prepared by the polymeric precursor technique. The presence of broad PL band emission spectra at room temperature indicated increasing structural order with addition of rare earth elements.

10.36.910. ВПЛИВ ЛЕГУВАННЯ РІДКОЗЕМЕЛЬНИМИ ЕЛЕМЕНТАМИ (Nd, Dy, Er, Lu) НА ОПТИЧНІ ВЛАСТИВОСТІ КРИСТАЛІВ АIIВVI

2019 ◽  
pp. 42-45
Author(s):  
Відринський Б. В., асп., Замуруєва О.В., к.ф.-м.н.
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Band Gap ◽  
Single Crystals ◽  
Nonlinear Optical ◽  
Room Temperature ◽  
Second Harmonic ◽  
Experimental Results ◽  
Powder Particles

У роботі встановлено вплив легування рідкоземельними елементами (Nd, Dy, Er, Lu) кристалів, на їх оптичні, нелінійно-оптичні властивості. З експериментальних результатів визначена : 95, 91, 98, 87 меВ для AgGaGe3Se8:Nd; AgGaGe3Se8:Dy; AgGaGe3Se8:Er; AgGaGe3Se8:Lu відповідно. Представлена оцінка ширини забороненої зони для усіх сполук при кімнатній температурі. Досліджено генерацію другої гармоніки, за допомогою методики порошку Куртца-Перр, що дає відносну оцінку ефективності нелінійно-оптичних перетворень. Наближення частинки порошку вважаються монокристалами з близькими розмірами до 100 мкм. The paper establishes the effect of doping with rare earth elements (Nd, Dy, Er, Lu) crystals on their optical, nonlinear optical properties. From experimental results determined: 95, 91, 98, 87 meV для AgGaGe3Se8:Nd; AgGaGe3Se8:Dy; AgGaGe3Se8:Er; AgGaGe3Se8:Lu respectively. Presented an estimate of the band gap for all compounds at room temperature. The generation of the second harmonic is investigated using the method of Kurtz-Perry powder, which gives a relative estimate of the efficiency of nonlinear optical transformations. Approximation of the powder particles are considered single crystals with similar sizes to 100 µm.

scholarly journals Trimethyl phosphate based neutral ligand room temperature ionic liquids for electrodeposition of rare earth elements

2018 ◽  
Vol 96 ◽  
pp. 88-92 ◽  
Author(s):  
Prashant Bagri ◽  
Huimin Luo ◽  
Ilja Popovs ◽  
Bishnu P. Thapaliya ◽  
Jeremy Dehaudt ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Neutral Ligand ◽  
Trimethyl Phosphate

Research on Microstructure and Room Temperature Plasticity of Mg94.5Zn4Y1Er0.5 Alloy Sheet

2011 ◽  
Vol 239-242 ◽  
pp. 3207-3210
Author(s):  
Zhong Jun Wang ◽  
Yang Xu ◽  
Jia Cheng ◽  
Zhao Jing Wang ◽  
Bao Hua Kang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Rare Earth Elements ◽  
Tensile Properties ◽  
Room Temperature ◽  
Transverse Direction ◽  
Hot Extrusion ◽  
Alloy Sheet ◽  
Basal Texture

The microstructure and tensile properties at room temperature of as-extruded Mg94.5Zn4Y1Er0.5 alloy sheet were studied. The results show that the alloy is mainly composed of equiaxial-liked α-(Mg) grains and W phase containing lots of rare earth elements (F.C.C. structure, a=0.707nm). The elongation and tensile strength of the alloy sheet in hot extruded and transverse direction are 25.5 %, 29.9 % and 247 MPa, 240 MPa, respectively. The above results manifest that the W phase stimulate the DRX during hot extrusion, reduce the preference of basal texture of magnesium alloy, markedly improve the plastically shaping capability at room temperature.

scholarly journals An exploratory study of recovery of rare-earth elements from monazite in mild conditions using statistical-mixture design

2021 ◽  
pp. 20-25
Author(s):  
Souza A.C.S.P ◽  
Giese E.C
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Organic Acids ◽  
Room Temperature ◽  
Acid Solutions ◽  
Light Rare Earth ◽  
Mild Conditions ◽  
Inorganic Acids ◽  
Phosphate Mineral ◽  
Light Rare Earth Elements

Monazite is a phosphate mineral, considered an essential source of light rare-earth elements (REE). The present work sought to evaluate different methods of solubilization of REE through the use of different concentrations of inorganic acids (H2SO4, HCl, and HNO3) and organic acids (citric, oxalic, and lactic) in mild conditions at room temperature. According to the results, the inorganic acid solutions favored the solubilization in order of Ce3+, La3+, Nd3+, Pr3+, and Sm3+ elements, while organic acid solutions only favored the solubilization of Ce3+ and La3+. Nitric acid was the more efficient leaching agent for the first group. In the case of organic acids, lactic acid solubilized Ce3+, while mixtures of lactic and citric acids appeared to solubilize La3+.

Thermal Properties of YSZ Powders for Plasma Spraying

2015 ◽  
Vol 227 ◽  
pp. 413-416 ◽  
Author(s):  
Marcin Drajewicz ◽  
Kamil Dychtoń ◽  
Marek Góral
Keyword(s):  
Thermal Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Zirconium Oxide ◽  
Room Temperature ◽  
Thermal Analyses ◽  
Ceramic Materials ◽  
Aircraft Industry ◽  
Thermal Methods ◽  
Better Than

The oxides in the case of theirs properties are important materials for industrial application especially, in aircraft industry for application as thermal barrier coatings. Thermal properties of zirconium oxide stabilized by yttria are better than other ceramic materials. This powder could be stabilized in room temperature by addition of rare earth elements. In this article the thermal analyses of yttria stabilized zirconia (YSZ) oxide are presented as a baseline for future measurements of thermal properties of YSZ powder with addition of rare earth elements. The thermal expansion, specific heat, thermal diffusivity and thermal conductivity of commercially available Matco 6700 powder offered by Sulzer Metco company were analyzed by thermal methods.

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