Synthesis of yttrium aluminates by the sol-gel process

Synthesis of polycrystalline yttrium iron garnet and yttrium aluminium garnet from organic precursors

“…YIG has been synthesized by the sol-gel method using an amorphous citrate gel [8] and also by the hydroly-0022-2461/91 $03.00 + .12 9 1991 Chapman & Hall sis of metal alkoxides [9]. YAG has also been synthesized using the sol-gel process by polymerizing metal alkoxides and acetates [10]. In each case, an amorphous intermediate phase is produced which leads to homogeneous garnet formation at low temperatures, 800 ~ for YIG and 810 ~ for YAG.…”

Formation of YAG from coprecipitated yttrium aluminium hydroxides

“…2, it is shown as nonstoichiometric in the Table. Our results are generally in agreement with those of the previous workers. The yttrium aluminium gels prepared by Gowda [10] were amorphous up to [12] noted that the YAHC crystallize only at temperatures >1200 K depending on the atmosphere in which the samples were heated.…”

“…However, Glushkova et al [9] found that the YAG formed from the hyroxides precursor contained other impurity phases. Gowda [10] reported the preparation of phases-pure YAG and other Y/AI oxides by the sol-gel process. Vrolijk and associates [11] studied the conditions for preparing yttrium aluminium hydroxides coprecipitate (YAHC) with minimum particulate agglomeration.…”

Synthesis of cubic yttrium aluminum garnet (YAG) powders by co-precipitation and two-step calcinations

“…Various wet-chemical methods have been developed and successfully used to synthesize pure and / or doped YAG. These involve precipitation [1,4,7,9,[14][15][16][17][18][19][20][21][22][23][24][25] , sol-gel [1,17,[26][27][28] , citrate gel [29] , hydrothermal [30] , solvothermal [6,31] , supercritical water [32,33] , combustion [34,35] , spray-pyrolysis [36,37] , microemulsion [38] , microwave irradiation [39] and modified Pechini routes [40] . Among them, precipitation method is one of the most commonly used techniques, because homogeneous multi-element compounds from which can be prepared effectively on a large scale and final products with improving phase purity can be formed at the temperature below 1000 °C.…”