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- Title
Electromagnetic properties of phosphate-coated ferrite composite materials.
- Authors
Hsu, J.-Y.; Kuo, S.-K.; Hung, Y.-H.
- Abstract
Sintered ferrite was treated with phosphoric acids to form phosphate-coated powders. The formation of the coating layer was verified by the improvement of oxidation resistance, microscopic morphologies, and evident reduction of conductivity of the powders. The coated powders were then blended with silicone to fabricate composite materials. The electromagnetic properties of the composites at the frequency range of 1 MHz to 1 GHz were investigated and found to be noticeably affected by the surface condition of the powders. The coating layer significantly reduced the imaginary part of permittivity of the composite owing to the improvement of insulation, while the resonance frequency was scarcely affected. The magnetization curves revealed that, compared to the composite containing as-prepared powder, the coated powder filled composites exhibited enhanced demagnetizing field, which consequently contributed to an obvious depression in magnetic permeability. Due to the modification of electromagnetic properties, the phosphate-coated ferrite composites were found to be practical materials as a substrate of radio frequency identification (RFID) metal tag. The impedance measurement results revealed that the phosphate-coated ferrite composites could remedy destructive interference imposed by metal and was beneficial for fabrication of RFID metal tag.
- Subjects
ELECTROMAGNETISM; PHOSPHATES; FERRITES; SINTERING; COMPOSITE materials; ELECTRIC properties; RADIO frequency identification systems
- Publication
Journal of Materials Science: Materials in Electronics, 2012, Vol 23, Issue 11, p1944
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-012-0685-x