We can make superior absorption materials by using iron-sand ( magnetite ore ) tailings . In the range of 8～12 GHz , the absorption quantity is 18 dB , matching thickness is 0.58 mm , 10dB bandwidth is 2.5 GHz . The absorption quantity increases to 28.4 dB when the material is phase-transition by thermal treated . Replacing a part of iron-sand tailings with spinel-ferrite , the absorption peaks move to high frequency ; Absorption quantity and bandwidth are greatly increased when adding to it with trans...
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