PREPARATION OF YIG POWDERS BY COPRECIPITA TION

This paper deals with an original method for the preparation of ferrit es with the garnet structure by coprecipitation. The different transfo rmations of the coprecipitated hydroxide during heat treatment are stu died and reported. YIG crystallization from amorphous oxide is signifi cantly dependent of some parameters. However, pure homogeneous materia ls can be obtained at low temperature (800-850 degrees C) for Al subst ituted YIG Y3AlxFe(5-x)O-12 with 0.5 less than or equal to x less than or equal to 1.