Premium
Synthesis and Phase Composition of Lanthanide Phosphate Nanoparticles LnPO 4 (Ln=La, Gd, Tb, Dy, Y) and Solid Solutions for Fiber Coatings
Author(s) -
Boakye Emmanuel E.,
Mogilevsky Pavel,
Hay Randall S.,
Fair Geoff E.
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02737.x
Subject(s) - lanthanide , monazite , thermogravimetric analysis , phosphoric acid , nuclear chemistry , differential thermal analysis , materials science , inorganic chemistry , ammonium phosphate , phosphate , monoclinic crystal system , ammonium hydroxide , aqueous solution , scanning electron microscope , particle size , chemistry , crystallography , crystal structure , metallurgy , diffraction , ion , organic chemistry , paleontology , fertilizer , physics , optics , composite material , biology , zircon
Rare earth phosphates with rare earths of Gd, Tb, and Dy can form either monazite or xenotime. Hydrated lanthanide phosphate precursors to monazite and xenotime were made in aqueous solution. The particles were formed by adding dilute phosphoric acid (H 3 PO 4 ) to either; (a) lanthanide citrate (Ln‐Cit) or (b) lanthanide nitrate (LnNO 3 ) [Ln=La, Gd, Tb, Dy, and Y] solutions followed by altering the pH from ∼1 to ∼10 with ammonium hydroxide. Precursor particle size and morphology was characterized by scanning electron microscopy, (SEM) and weight loss was characterized by thermogravimetric analysis (TGA). The phase presence at temperature was determined by differential thermal analysis (DTA) and X‐ray diffraction. The influence of precursor preparation method on the presence of either monazite or xenotime after heat treatment is discussed.