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RESEARCH PRODUCT
Synthesis of YAG nanopowder by the co-precipitation method: Influence of pH and study of the reaction mechanisms
Marc EichhornElodie BarraudSophie Le GalletCaroline MarlotFrédéric Bernardsubject
Materials scienceCoprecipitationInorganic chemistryOxideTRANSPARENT CERAMICSFABRICATIONchemistry.chemical_element02 engineering and technology01 natural scienceslaw.inventionInorganic Chemistrychemistry.chemical_compoundlawAluminiumYTTRIUM-ALUMINUM-GARNET0103 physical sciencesMaterials ChemistryNANO-SIZED POWDERCalcinationPhysical and Theoretical ChemistryPerovskite (structure)010302 applied physicsPRECURSORSPrecipitation (chemistry)Yttrium021001 nanoscience & nanotechnologyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialschemistryChemical engineeringPRECIPITATIONCeramics and CompositesLASER0210 nano-technologyMonoclinic crystal systemdescription
International audience; 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, Y4Al2O9) and yttrium oxide (Y2O3) 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 degrees C passing through an intermediate phase called YAP (Yttrium Aluminium Perovskite, YAlO3). Local chemical heterogeneities are responsible for the deviation of the Y:Al ratio and the formation of YAP during heat treatment.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-07-01 |