scholarly journals Effect of Diglycolamide Ligands Structure on Extraction Performance of Heavy Rare Earth Ions

2020 ◽  
Vol 27 (2) ◽  
pp. 81-89
Author(s):  
Huihui DU ◽  
Xiujing PENG ◽  
Yu CUI ◽  
Guoxin SUN
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Heavy Rare Earth ◽  
Extraction Performance

Preparation and structure of carbonated calcium hydroxyapatite substituted with heavy rare earth ions

2012 ◽  
Vol 47 (5) ◽  
pp. 1257-1263 ◽  
Author(s):  
Akemi Yasukawa ◽  
Kazuhiko Kandori ◽  
Hidekazu Tanaka ◽  
Keiko Gotoh
Keyword(s):  
Rare Earth ◽  
Calcium Hydroxyapatite ◽  
Rare Earth Ions ◽  
Heavy Rare Earth

scholarly journals On the Hydration of Heavy Rare Earth Ions: Ho3+, Er3+, Tm3+, Yb3+ and Lu3+—A Raman Study

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1953 ◽  
Author(s):  
Wolfram Rudolph ◽  
Gert Irmer
Keyword(s):  
Rare Earth ◽  
Ion Pairs ◽  
Outer Sphere ◽  
Solute Concentration ◽  
Rare Earth Ions ◽  
Chloro Complex ◽  
Heavy Rare Earth ◽  
Terahertz Region ◽  
Wavenumber Range ◽  
Polarized Raman

Raman spectra of aqueous Ho3+, Er3+, Tm3+, Yb3+, and Lu3+-perchlorate solutions were measured over a large wavenumber range from 50–4180 cm−1. In the low wavenumber range (terahertz region), strongly polarized Raman bands were detected at 387 cm−1, 389 cm−1, 391 cm−1, 394 cm−1, and 396 cm−1, respectively, which are fairly broad (full widths at half height at ~52 cm−1). These isotropic Raman bands were assigned to the breathing modes, ν1 Ln–O of the heavy rare earth (HRE) octaaqua ions, [Ln(H2O)8]3+. The strong polarization of these bands (depolarization degree ~0) reveals their totally symmetric character. The vibrational isotope effect was measured in Yb(ClO4)3 solutions in H2O and D2O and the shift of the ν1 mode in changing from H2O to D2O further supports the character of the band. The Ln–O bond distances of these HRE ions (Ho3+, Er3+, Tm3+, Yb3+, and Lu3+) follow the order of Ho–O > Er–O > Tm–O > Yb–O > Lu–O which correlates inversely with the band positions of the breathing modes of their corresponding octaaqua ions [Ln(OH2)8]3+. Furthermore, the force constants, kLn–O, were calculated for these symmetric stretching modes. Ytterbium perchlorate solutions were measured over a broad concentration range, from 0.240 mol·L−1 to 2.423 mol·L−1, and it was shown that with increasing solute concentration outer-sphere ion pairs and contact ion pairs were formed. At the dilute solution state (~0.3 mol·L−1), the fully hydrated ions [Yb(H2O)8]3+ exist, while at higher concentrations (CT > 2 mol·L−1), ion pairs are formed. The concentration behavior of Yb(ClO4)3 (aq) shows similar behavior to the one observed for La(ClO4)3(aq), Ce(ClO4)3(aq) and Lu(ClO4)3(aq) solutions. In ytterbium chloride solutions in water and heavy water, representative for the behavior of the other HRE ions, 1:1 chloro-complex formation was detected over the concentration range from 0.422–3.224 mol·L−1. The 1:1 chloro-complex in YbCl3(aq) is very weak, diminishing rapidly with dilution and vanishing at a concentration < 0.4 mol·L−1.

Influence of heavy rare earth ions substitution on microstructure and magnetism of nanocrystalline magnetite

2009 ◽  
Vol 472 (1-2) ◽  
pp. 571-575 ◽  
Author(s):  
Z. Cvejic ◽  
B. Antic ◽  
A. Kremenovic ◽  
S. Rakic ◽  
G.F. Goya ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Heavy Rare Earth

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

Magnetic susceptibility of liquid heavy rare earth metals

1979 ◽  
Vol 40 (C5) ◽  
pp. C5-260-C5-261 ◽  
Author(s):  
M. Müller ◽  
E. Huber ◽  
H.-J. Güntherodt
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Rare Earth Metals ◽  
Heavy Rare Earth
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