A Synthetic Study of the Solid Solutions in the Systems and La2(CH3)3·8H2O-Ce2(CO3)3·8H2O and La(OH)CO3–Ce(OH)CO3

Abstract

The solid solutions in the systems La2(CO3)3·8H2O–Ce2(CO3)3·8H2O and La(OH)CO3–Ce(OH)CO3 have been synthesized by the hydrolysis of the lanthanum–cerium trichloroacetates. The X-ray diffraction data of the solid solutions of La2(CO3)3·8H2O–Ce2(CO3)3·8H2O indicated a lanthanite-type structure while the data of La(OH)CO3–Ce(OH)CO3 indicated a bastnaesite-type structure. The correlations between lanthanite, bastnaesite, and calkinsite, and the lanthanite-bastnaesite transformation are discussed.

Infrared and Raman spectroscopic characterization of the carbonate mineral huanghoite – And in comparison with selected rare earth carbonates

“…The complexity of the symmetric stretching region is reflected in the (CO 3 anion suggest the partial substitution of F by OH and the existence of a F-OH series between huangoite-Ce and an undescribed mineral phase where OH is dominant in the structure.…”

“…There are a number of halogen containing carbonates including bastnaesite (often written as bastnasite and bastnäsite) [(Ce,La)CO 3 CO 3 Cl] [1]. In fact this group of minerals supplies more than 70% of the world's supply of rare earths.…”

“…In addition minerals based upon hydroxbastnasite are also 0022-2860/$ -see front matter Ó 2013 Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.molstruc.2013.07.051 known but little or no information is available for this mineral [2][3][4]. It is probable that the mineral decrespignyite-(Y) is structurally related to bastnäsite-synchysite-parsite group all of which adopt a hexagonal or at least a pseudohexagonal layered structure based upon repeat units of REE-CO 2À 3 (F,OH) [5][6][7].…”

Hydrothermal Synthesis of LaCO3OH and Ln3+-doped LaCO3OH Powders under Ambient Pressure and Their Transformation to La2O2CO3and La2O3

“…To date, LaCO 3 OH powders have been synthesized using a variety of methods, including the hydrolysis of LaCl 3 -trichloroactic acid solution by ammonia, 7 hydrolysis of La(III) carbonate under high 8 and ambient 9 pressure, reaction of LaBrOH with CO 2 , 9 solvothermal reaction of La 2 O 3 in a mixed solvent of ionic liquid and water, 10 and solvent-free dissociation of La(III) acetate hydrate under autogenic pressure at 700 o C.…”

Hydroxide carbonates and oxide carbonate hydrate of rare earths grown on glass via a hydrothermal route

“…Therefore, it is expected that by varying the experimental conditionsincluding the type and concentration of starting material, the reaction temperature, pH, etc.-a wide range of unique rare-earth compounds with varied compositions, morphologies and sizes can be produced. For instance, by mixing rare-earth starting materials, it should be possible to prepare new materials with mixed rare-earth species, such as the La 1Àx Ce x OHCO 3 particles [24] and La 1Àx Ce x OHSO 4 particles [25] that were prepared elsewhere from mixed rare-earth precursor salts.…”