Phase Diagrams of Lead Difluoride Systems with Rare-Earth Fluorides

2021 ◽  
Vol 66 (2) ◽  
pp. 245-252
Author(s):  
P. P. Fedorov
Keyword(s):  
Rare Earth ◽  
Phase Diagrams ◽  
Rare Earth Fluorides

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.

High-pressure Syntheses and Characterization of the Rare-earth Fluoride Borates RE2(BO3)F3 (RE=Tb, Dy, Ho)

2013 ◽  
Vol 68 (11) ◽  
pp. 1198-1206 ◽  
Author(s):  
Ernst Hinteregger ◽  
Michael Enders ◽  
Almut Pitscheider ◽  
Klaus Wurst ◽  
Gunter Heymann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Rare Earth ◽  
Monoclinic Space Group ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Structure Determinations ◽  
New Compounds ◽  
Rare Earth Fluorides

The new rare-earth fluoride borates RE2(BO3)F3 (RE=Tb, Dy, Ho) were synthesized under highpressure/ high-temperature conditions of 1:5 GPa=1200 °C for Tb2(BO3)F3 and 3:0 GPa=900 °C for Dy2(BO3)F3 and Ho2(BO3)F3 in a Walker-type multianvil apparatus from the corresponding rareearth sesquioxides, rare-earth fluorides, and boron oxide. The single-crystal structure determinations revealed that the new compounds are isotypic to the known rare-earth fluoride borate Gd2(BO3)F3. The new rare-earth fluoride borates crystallize in the monoclinic space group P21/c (Z = 8) with the lattice parameters a=16:296(3), b=6:197(2), c=8:338(2) Å , b =93:58(3)° for Tb2(BO3)F3, a= 16:225(3), b = 6:160(2), c = 8:307(2) Å , b = 93:64(3)° for Dy2(BO3)F3, and a = 16:189(3), b = 6:124(2), c = 8:282(2) Å , β= 93:69(3)° for Ho2(BO3)F3. The four crystallographically different rare-earth cations (CN=9) are surrounded by oxygen and fluoride anions. All boron atoms form isolated trigonal-planar [BO3]3- groups. The six crystallographically different fluoride anions are in a nearly planar coordination by three rare-earth cations.

ChemInform Abstract: The Versatility of Solid-State Metathesis Reactions: From Rare Earth Fluorides to Carbodiimides.

ChemInform ◽  
2009 ◽  
Vol 40 (20) ◽  
Author(s):  
Leonid Unverfehrt ◽  
Jochen Glaser ◽  
Markus Stroebele ◽  
Sonja Tragl ◽  
Katharina Gibson ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solid State ◽  
Metathesis Reactions ◽  
Rare Earth Fluorides

Nanocrystalline rare earth fluorides doped with Pr3+ ions

2016 ◽  
Vol 34 (8) ◽  
pp. 802-807 ◽  
Author(s):  
Marcin Runowski ◽  
Stefan Lis
Keyword(s):  
Rare Earth ◽  
Rare Earth Fluorides

Epitaxial Growth of Rare Earths on Rare Earth Fluorides and Rare Earth Fluorides on Rare Earths: Two New Epitaxial Systems Accessed by MBE

1987 ◽  
Vol 103 ◽  
Author(s):  
R. F. C. Farrow ◽  
S. S. P. Parkin ◽  
M. Lang ◽  
K. P. Roche
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Rare Earth Metal ◽  
Basal Plane ◽  
Earth Metal ◽  
Magnetic Ordering ◽  
Metal Films ◽  
Squid Magnetometry ◽  
New Family ◽  
Rare Earth Fluorides

ABSTRACTWe report two new epitaxial systems, prepared by MBE: basal plane epitaxy of the rare earth metal Dy onto LaF3 films and vice versa. SQUID magnetometry studies indicate that buried epitaxial Dy films, of ∼300Å thick, order ferromagnetically at similar temperatures to bulk Dy crystals.These epitaxial systems are one member of a new family of epitaxial systems of basal plane epitaxy of rare earth metals on rare earth fluorides and vice versa. Such systems may be used to probe the effects of strain and dimensionality on magnetic ordering in rare earth metal films and multilayers.

scholarly journals Electrochemical Recovery of Rare Earth Elements from Magnets: Conversion of Rare Earth Based Metals into Rare Earth Fluorides in Molten Salts

2017 ◽  
Vol 58 (3) ◽  
pp. 400-405 ◽  
Author(s):  
Aida Abbasalizadeh ◽  
Annelies Malfliet ◽  
Seshadri Seetharaman ◽  
Jilt Sietsma ◽  
Yongxiang Yang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Molten Salts ◽  
Rare Earth Fluorides
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