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Rare earth phosphate powders RePO4·nH2O (Re=La, Ce or Y)—Part I. Synthesis and characterization by S Lucas; E Champion; D Bregiroux; D Bernache-Assollant; F Audubert is a Materials Science article available to read on EtoBox.

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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)PO 4 Á nH 2 O were single phase. They exhibited a Re/P mole ratio smaller than 1 due to residual H 3 PO 4 adsorbed at their surface. A unit formula could be written as RePO 4 Á nH 2 O Á (H 3 PO 4 ) x with nE0:5 (for Re=La or Ce) or n 1⁄4 2 (for Re=Y) and xo0:1: 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.

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Author

S Lucas; E Champion; D Bregiroux; D Bernache-Assollant; F Audubert

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-4596)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)