Abstract
Iron deficient Mn-Zn ferrite was prepared by doping the microwave induced pyrolysis char of wastewater sludge. The effects of doping with different dosages of pyrolysis char on the crystallization phase, micromorphology, crystal microstructures, electromagnetic parameters and microwave absorbing properties were investigated. The iron deficient ferrite samples with microwave sintering at a temperature of 900°C had a spinal structure, and the main crystallization phase was Zn0.75Mn0.75Fe1.5O4. The crystal grains with the dopants of 20wt% were homogeneous, and the average grain size was about 36.80nm. The crystal of ferrite with dopants of 20wt% had a clear grain boundary, and the crystallinity degree reached 94.76%. Moreover, the electromagnetic parameters (permittivity and permeability) of Zn0.75Mn0.75Fe1.5O4 ferrites were changed due to the dopants improving the electromagnetic wave absorbing properties. The electromagnetic wave reflection loss of the Zn0.75Mn0.75Fe1.5O4 ferrite samples with the dopants of 20wt% increased to −4.2dB.
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