Solid state 31P MAS-NMR study of the process of crystallization and transformation of Yttrium orthophosphate synthesized by coprecipitation in basic medium



Maria ZAKI  (1), Ahmed AAMILI  (1), Abderrahim SADEL  (1), Mohammed ZAHIR  (1), Malika EL-GHOZZI  (2), Jean-François PILICHOWSKI (3), Daniel AVIGNANT  (2)  


Author(s) Affiliation(s)

 (1) Laboratoire de Physico-chimie des Matériaux, Université Chouaïb Doukkali, Faculté des Sciences, BP 20, 24000 El-Jadida, MAROC
(2) Laboratoire des Matériaux inorganiques, UPRES A-6002 CNRS, Université Blaise Pascal, 63177 Aubière, FRANCE

(3) Laboratoire de Photochimie, UMR 6505CNRS, Université Blaise Pascal, 63177 Aubière, FRANCE



Annales de chimie Science des Matériaux

2000, 25 (supplt 1), pp.S149-S152




TGA, XRD and multinuclear solid state NMR were used to follow the dehydration and solid state transformation of the amorphous precipitate obtained by coprecipitation of yttrium nitrate hexahydrate and potassium phosphate trihydrate in basic medium, yielding the hexagonal YPO4,xKOH phase which further progressively transforms to tetragonal zircon-type YPO4 orthophosphate, either under progressive heating or during heating steps at different temperatures. The ion exchange properties of the intermediate phase were investigated by solid state MAS NMR.