Synthesis of YAG nanopowder by the co-precipitation method: Influence of pH and study of the reaction mechanisms

Journal Article · Sun Jul 15 00:00:00 EDT 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.02.063· OSTI ID:22012179

Marlot, Caroline ^[1]; Barraud, Elodie ^[1]; Le Gallet, Sophie ^[2]; Eichhorn, Marc ^[1]; Bernard, Frederic ^[2]

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1. French-German Research Institute of Saint-Louis, 5 rue du General Cassagnou, 68300 Saint-Louis (France)
2. Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS, Universite de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon Cedex (France)

YAG nanopowders with an average grain size of 30 nm have been successfully synthesized by the co-precipitation method using nitrates with precipitant of ammonium hydrogen carbonate. The influence of precipitation conditions such as pH, aging time and calcination temperature on the formation of secondary phases has been studied. The accurate control of pH value at every stage of precipitation process is crucial to avoid the presence of YAM (Yttrium Aluminium Monoclinic, Y{sub 4}Al{sub 2}O{sub 9}) and yttrium oxide (Y{sub 2}O{sub 3}) after calcination. The reaction mechanisms have been investigated using different techniques such as infrared spectroscopy, x-ray diffraction and thermal analyses. The YAG phase is formed around 1050 Degree-Sign C passing through an intermediate phase called YAP (Yttrium Aluminium Perovskite, YAlO{sub 3}). Local chemical heterogeneities are responsible for the deviation of the Y:Al ratio and the formation of YAP during heat treatment. - Graphical abstract: Synthesis of YAG nanopowder by the co-precipitation method: Influence of pH and study of the reaction mechanisms, Marlot et al. Highlights: Black-Right-Pointing-Pointer Synthesis of pure YAG nanoparticles by the co-precipitation method. Black-Right-Pointing-Pointer Influence of pH value on the formation of secondary phases all along the process. Black-Right-Pointing-Pointer Study of the importance of pH using titration method. Black-Right-Pointing-Pointer Chemical evolution of the precursor during calcinations. Black-Right-Pointing-Pointer Proposition for reaction mechanisms.

• OSTI ID: 22012179
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. . 191; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ALUMINIUM
CALCINATION
CARBONATES
CHEMICAL PROPERTIES
COPRECIPITATION
GRAIN SIZE
INFRARED SPECTRA
MONOCLINIC LATTICES
NANOSTRUCTURES
NEODYMIUM LASERS
PEROVSKITE
PH VALUE
POWDERS
REACTION KINETICS
SYNTHESIS
TITRATION
X-RAY DIFFRACTION
YTTRIUM
YTTRIUM OXIDES