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- W1991144227 abstract "Rare earth phosphate powders (Re=La, Ce or Y) were synthesized from an aqueous precipitation method. The effect of temperature, pH, ripening time and Re/P mole ratio of the initial reagents was investigated. Elementary analysis, surface area and bulk density measurements, FT-infrared spectroscopy, X-ray diffraction and SEM observations were performed to characterize the precipitates. All the powders of hydrated form (La, Ce or Y)PO4·nH2O were single phase. They exhibited a Re/P mole ratio smaller than 1 due to residual H3PO4 adsorbed at their surface. A unit formula could be written as RePO4·nH2O·(H3PO4)x with n≈0.5 (for Re=La or Ce) or n=2 (for Re=Y) and x<0.1. High-temperature thermogravimetry was necessary to detect these residuals and insure the purity of the powders. The precipitation of lanthanum or cerium phosphates was slow, resulting in powders with a high specific surface. The precipitation of yttrium phosphate was faster and significant crystal growth occurred during the ripening, which resulted in a whisker-like morphology and a very low specific surface." @default.
- W1991144227 created "2016-06-24" @default.
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- W1991144227 date "2004-04-01" @default.
- W1991144227 modified "2023-10-14" @default.
- W1991144227 title "Rare earth phosphate powders RePO4·nH2O (Re=La, Ce or Y)—Part I. Synthesis and characterization" @default.
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- W1991144227 doi "https://doi.org/10.1016/j.jssc.2003.11.003" @default.
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