Abstract
Ce3+ doped nickel ferrite was composited with silver (Ag/NiFe2-xCexO4) by the hydrothermal method. Microwave absorption of the synthesized materials was characterized by dielectric and magnetic losses, the power absorption coefficient, which reveals the innate behavior of a material, and the reflection coefficient in the form of s11, which reveals the behavior of the material acting as a circuit element, rather than by reflection loss, RL, which is an inappropriate parameter, used in previous calculations by other workers. Experimental values for s11 have been reproduced theoretically. The reasons why some absorption peaks are higher than others have been identified. The results clearly show that there is an interaction between the components of the Ag/NiFe2-xCexO4 composite as it exhibits much better microwave absorption performance than single compound NiFe2O4; compositing with Ag and doping with Ce3+ by appropriate amounts have shifted the microwave resonances to high resistance regions for electric and magnetic dipolar oscillations of NiFe2O4, and dielectric loss is more prominent than magnetic loss for Ag/NiFe2-xCexO4.
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