Homoleptic Rare Earth Dipyridylamides [Ln2(N(NC5H4)2)6], Ln = Ce, Nd, Sm, Ho, Er, Tm, Yb, and Sc:  Metal Oxidation by the Amine Melt and in 1,2,3,4-Tetrahydroquinoline with the Focus of Different Metal Activation by Amalgams, Liquid Ammonia, and Microwaves

2006 ◽  
Vol 45 (6) ◽  
pp. 2678-2687 ◽  
Author(s):  
Klaus Müller-Buschbaum ◽  
Catharina C. Quitmann
Keyword(s):  
Rare Earth ◽  
Liquid Ammonia ◽  
Metal Oxidation

Reduction potentials of rare earth couples in liquid ammonia

1976 ◽  
Vol 15 (11) ◽  
pp. 2849-2852 ◽  
Author(s):  
R. Navaneethakrishnan ◽  
James C. Warf
Keyword(s):  
Rare Earth ◽  
Liquid Ammonia ◽  
Reduction Potentials

Preparation and Catalytic Properties of Rare Earth Amides Obtained by Reactions of Eu or Yb Metals with Liquid Ammonia.

ChemInform ◽  
2006 ◽  
Vol 37 (22) ◽  
Author(s):  
Hayao Imamura ◽  
Yoshihisa Sakata ◽  
Yoshihiro Tsuruwaka ◽  
Satoshi Mise
Keyword(s):  
Rare Earth ◽  
Liquid Ammonia ◽  
Catalytic Properties

The 1-N amides 1∞[Eu2(Pyr)4(PyrH)2(NH3)] · PyrH and [Yb2(Cbz)4(NH2)2(NH3)4] · 3CbzH: Distinctions in the crystal structures, thermal properties and ammonolysis tendency

2005 ◽  
Vol 220 (2/3) ◽  
Author(s):  
Klaus Müller-Buschbaum ◽  
Caterina C. Quitmann
Keyword(s):  
Thermal Properties ◽  
Rare Earth ◽  
Low Temperature ◽  
Crystal Structures ◽  
Liquid Ammonia ◽  
Rare Earth Metals ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
The Rare Earth

AbstractThe low-temperature oxidation of the rare earth metals europium and ytterbium with the 1-N amines pyrrole and carbazole in liquid ammonia gave the pyrrolate

The study of rare-earth metal oxidation by AES

Vacuum ◽  
1990 ◽  
Vol 41 (1-3) ◽  
pp. 25-27 ◽  
Author(s):  
M Ushio ◽  
S Higuchi ◽  
M Asano ◽  
H Misaki ◽  
Y Nakanishi
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Metal Oxidation

scholarly journals Speciation of Be2+ in acidic liquid ammonia and formation of tetra- and octanuclear beryllium amido clusters

2020 ◽  
Vol 11 (21) ◽  
pp. 5415-5422 ◽  
Author(s):  
Matthias Müller ◽  
Antti J. Karttunen ◽  
Magnus R. Buchner
Keyword(s):  
Coordination Chemistry ◽  
Liquid Ammonia ◽  
Metal Oxidation ◽  
Beryllium Metal

The boundaries of beryllium metal oxidation in acidic ammonia have been explored. This enabled the isolation of the tetra- and octa-nuclear beryllium amide complexes. The latter exhibits a completely new structural motive in coordination chemistry.

Preparation and catalytic properties of rare earth amides obtained by reactions of Eu or Yb metals with liquid ammonia

2006 ◽  
Vol 408-412 ◽  
pp. 1113-1117 ◽  
Author(s):  
Hayao Imamura ◽  
Yoshihisa Sakata ◽  
Yoshihiro Tsuruwaka ◽  
Satoshi Mise
Keyword(s):  
Rare Earth ◽  
Liquid Ammonia ◽  
Catalytic Properties

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.

Study of segregation in La1.8Sr0.2CuO4 superconductor by STEM-EDS microanalysis

1987 ◽  
Vol 45 ◽  
pp. 54-55
Author(s):  
T. F. Kelly ◽  
P. J. Lee ◽  
E. E. Hellstrom ◽  
D. C. Larbalestier
Keyword(s):  
Rare Earth ◽  
High Field ◽  
Transport Current ◽  
Total Thickness ◽  
New Class ◽  
Ceramic Superconductors ◽  
Current Densities ◽  
Group Ii ◽  
Eds Microanalysis

Recently there has been much excitement over a new class of high Tc (>30 K) ceramic superconductors of the form A1-xBxCuO4-x, where A is a rare earth and B is from Group II. Unfortunately these materials have only been able to support small transport current densities 1-10 A/cm2. It is very desirable to increase these values by 2 to 3 orders of magnitude for useful high field applications. The reason for these small transport currents is as yet unknown. Evidence has, however, been presented for superconducting clusters on a 50-100 nm scale and on a 1-3 μm scale. We therefore planned a detailed TEM and STEM microanalysis study in order to see whether any evidence for the clusters could be seen.A La1.8Sr0.2Cu04 pellet was cut into 1 mm thick slices from which 3 mm discs were cut. The discs were subsequently mechanically ground to 100 μm total thickness and dimpled to 20 μm thickness at the center.

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