H. Takizawa et al., Rapid formation and growth of bixbyite-type (In0.67Fe0.33)(2)O-3 by 28 GHzmicrowave irradiation, J AM CERAM, 83(9), 2000, pp. 2321-2323
(In0.67Fe0.33)(2)O-3 with the bixbyite structure was synthesized via 28 GHz
microwave irradiation, using multimode microwave heating equipment. Indium
sesquioxide strongly absorbs 28 GHz microwaves, and this strong coupling w
ith microwave energy can be used to drive a reaction with iron sesquioxide.
A mixture of In2O3 and alpha-Fe2O3 powders (In:Fe ratio of 2:1) was irradi
ated with microwaves at a frequency of 28 GHz, The mixture was heated to 14
00 degrees C during the microwave irradiation. The formation of a solid sol
ution was completed within a minute, which indicated a drastic enhancement
of the reaction rate. Scanning electron microscopy revealed remarkable grai
n growth under microwave irradiation.