Advanced of Rare Earth Fluorides Technology

The thermochemical processes of synthesis and purification of rare earth metals fluorides through the transfer of fluoroammonium complexes were discussed. By differential thermal calorimetry the temperature maxima of rates of formation and decomposition of complex compounds were defined and the values of the apparent activation energy processes were determined. It is possible the use of fluoroammonium systems to develop the preparation of anhydrous fluorides of rare earth metals.

Download Full-text

Synthesis and Thermal Analysis of C16H13N5O3 and its Complexes with Rare Earth

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.749.521 ◽

2013 ◽

Vol 749 ◽

pp. 521-526

Author(s):

Si Jiao Wang ◽

Xiang Rong Liu ◽

Chao Chao Song ◽

Shun Shen Zhao ◽

Lan Ying Yan ◽

...

Keyword(s):

Activation Energy ◽

Thermal Analysis ◽

Thermal Decomposition ◽

Rare Earth ◽

Apparent Activation Energy ◽

Elemental Analysis ◽

Rare Earth Complexes ◽

Thermal Gravimetric ◽

Decomposition Processes ◽

Ft Ir

The 2-carboxybenzaldehyde-1H-benzotriazol-1-aceylhydrazone (C16H13N5O3) has been synthesized and used in preparing thirteen novel rare earth complexes. The complexes were characterized by elemental analysis, FT-IR, and UV-Vis, and the formula is RE (C16H11N5O3)·NO3·xH2O·yC2H5OH (RE=La, Ce, Pr, Nd, Sm, Eu, Tb, Ho, Er, Yb) and RE(C16H12N5O3)2·NO3·5H2O (RE=Gd, Dy, Y) .The thermal decomposition processes of the thirteen complexes were studied by thermal gravimetric technology and their apparent activation energy values were calculated by Kissingers and Ozawass method.

Download Full-text

Electrochemical Extraction of Rare Earth Metals in Molten Fluorides: Conversion of Rare Earth Oxides into Rare Earth Fluorides Using Fluoride Additives

Journal of Sustainable Metallurgy ◽

10.1007/s40831-017-0120-x ◽

2017 ◽

Vol 3 (3) ◽

pp. 627-637 ◽

Cited By ~ 13

Author(s):

Aida Abbasalizadeh ◽

Annelies Malfliet ◽

Seshadri Seetharaman ◽

Jilt Sietsma ◽

Yongxiang Yang

Keyword(s):

Rare Earth ◽

Rare Earth Metals ◽

Rare Earth Oxides ◽

Molten Fluorides ◽

Electrochemical Extraction ◽

Rare Earth Fluorides

Download Full-text

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100064761 ◽

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.

Download Full-text