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- W2049274636 abstract "Z-type hexaferrites are considered for applications in the 10 MHz to 1 GHz band due to their potential to overcome Snoek's limit. However, state-of-art hexaferrites have high magnetic loss, related to substantial micro-structural inhomogeneity and processing details. The dependence of magnetic properties on the ceramic processing route is demonstrated in this paper for Ba <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sub> Co <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> Fe <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>24</sub> O <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>41</sub> (Co <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> Z) compositions. Fine Co <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> Z powders prepared by wet-chemical synthesis were used to obtain different microstructures through dry or colloidal compaction, followed by sintering with different temperature programs. Large variations in permeability and loss behavior were found between samples with different processing histories and hence microstructures. The best results obtained were μ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>r</sub> <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>'</sup> ~ 2.5 and μ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>r</sub> <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>''</sup> <; 0.2 (tanδ ≤ 0.1) for the 10 to 930 MHz band. This is a significant improvement w.r.t. previously reported values." @default.
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- W2049274636 date "2011-08-01" @default.
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- W2049274636 title "Low Loss Z-Type $hbox{Ba}_{3}hbox{Co}_{2}hbox{Fe}_{24}hbox{O}_{41}$ Hexaferrites for Antennas and RF Devices" @default.
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- W2049274636 doi "https://doi.org/10.1109/tmag.2011.2128876" @default.
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