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Rapid Formation and Growth of Bixbyite‐Type (In 0.67 Fe 0.33 ) 2 O 3 by 28 GHz Microwave Irradiation
Author(s) -
Takizawa Hirotsugu,
Uheda Kyota,
Endo Tadashi
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01555.x
Subject(s) - bixbyite , sesquioxide , microwave , irradiation , analytical chemistry (journal) , materials science , indium , microwave irradiation , chemistry , optoelectronics , metallurgy , physics , chromatography , quantum mechanics , nuclear physics
(In 0.67 Fe 0.33 ) 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 with microwave energy can be used to drive a reaction with iron sesquioxide. A mixture of In 2 O 3 and α‐Fe 2 O 3 powders (In:Fe ratio of 2:1) was irradiated with microwaves at a frequency of 28 GHz. The mixture was heated to 1400°C during the microwave irradiation. The formation of a solid solution was completed within a minute, which indicated a drastic enhancement of the reaction rate. Scanning electron microscopy revealed remarkable grain growth under microwave irradiation.