Characterization of yttrium aluminate garnet precursors synthesized via precipitation using ammonium bicarbonate as the precipitant

Ji-Guang Li, Takayasu Ikegami, Jong-Heun Lee, Toshiyuki Mori
2000 Journal of Materials Research  
Stoichiometric yttrium aluminate garnet (Y 3 Al 5 O 12 ) precursors with a wide range of chemical compositions were precipitated by dripping a mixed solution of ammonium aluminum sulfate and yttrium nitrate into ammonium bicarbonate solutions. The resultant precursors were characterized by chemical analysis, infrared spectroscopy, differential thermal analysis/thermogravimetry, x-ray diffractometry, and scanning electron microscopy. The effects of reaction temperature, precipitant
more » ... itant concentration, dripping speed of the salt solution, and the molar ratio of precipitant/total-cations on the composition, thermal behavior, and particle morphology of the resultant precursors were investigated. The precipitation conditions that yield carbonate precursors composed of ammonium dawsonite [NH 4 Al(OH) 2 CO 3 ] and yttrium normal carbonate [Y 2 (CO 3 ) 3 и 3H 2 O] were determined.
doi:10.1557/jmr.2000.0342 fatcat:4vzaq5hsindrnaein4tqyelxuy