Preparation of New Polycrystalline Yttrium Aluminium Garnet Fibersby the Sol-Gel Method

A sol-gel process was used to synthesize YAG precursor sols by using Y(NO3)3·6H2O, Al pellets, water and acetic acid as raw materials. After a series of hydrolysis-condensation reaction, stable and transparent precursor sols were produced. An amount of water-soluble polymers of PEO were then added to the sols and polycrystalline yttrium aluminum garnet fibers were prepared after condensation, dry spinning and heat-treatment at 900℃.