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Samples of BaCO 3 + 4 Fe 3 O 4 mixtures were microwave irradiated in an 83GHz gyrotron beam system and a 2.45GHz single mode system. Twenty seconds of irradiation with 2–6kW and 83GHz energy lead to the formation of the BaFe 12 O 19 form in major quantities, with unreacted Fe 2 O 3 in minor quantities. A combination of 3kW power and 90s irradiation...
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