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Fe73.5Cu1Nb3Si15.5B7 nanocrystalline powder cores with different particle sizes ranging from 10 to 125 µm were fabricated by cold-pressing techniques. The cores exhibited increased core loss Pcv and decreased initial permeability µi with addition of fine powders below 50 µm in size, and the content should be less than 40 mass%. It was thought to be closely related to the high coercive force Hc due...
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