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

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

“…11 LaCO 3 OH powders have been also prepared by a hydrothermal reaction in an autoclave using the following reagents: LaCl 3 and thiourea, 12,13 La(NO 3 ) 3 and urea, 4,14 La(NO 3 ) 3 , glucose, and acrylamide, 15 La 2 O 3 and glycine, 16 LaCl 3 and gelatin, 17 La(oleate) 3 and aqueous tertbutylamine, 18 La…”

The role of amorphous precursors in the crystallization of La and Nd carbonates

“…Many studies have addressed the crystalline products of the synthesis of REE carbonates from aqueous solutions as a function of crystallization temperature, pressure, nature and concentrations of reagents or stirring. [32][33][34] Furthermore, some studies have focused on the effect of the ionic radii of different REEs on the crystal structure of the crystalline product. 33,35 However, information about the early stages of the precipitation reactions and the role that amorphous precursors or metastable intermediates may play in the crystallization pathways is surprisingly scarce.…”

“…[32][33][34] Furthermore, some studies have focused on the effect of the ionic radii of different REEs on the crystal structure of the crystalline product. 33,35 However, information about the early stages of the precipitation reactions and the role that amorphous precursors or metastable intermediates may play in the crystallization pathways is surprisingly scarce. Recently, we have shown 36 that dysprosium (Dy) carbonates form via the crystallization of a highly hydrated amorphous precursor (amorphous dysprosium carbonate, Dy 2 (CO 3 ) 3 •4H 2 O).…”

Synthesis and characterization of single-crystalline PrCO3OH dodecahedral microrods and its thermal conversion to Pr6O11

“…Rare-earth hydroxyl carbonates can be formed readily either when rare-earth oxides are exposed to carbon dioxide and water vapor [15], or from aqueous systems containing rare-earth and carbonate species [16]. The hydrothermal process has been employed for the synthesis of rare-earth compounds, and novel structure can be obtained readily.…”