Fabrication and Characterization of Y 3 . 0 - X La X Fe 5 O 12 - PVA Composite as EM Waves Detector

This is our initial response towards fabricating a magnetic filled polymer composite samples potentially used as electromagnetic waves detector. Samples of lanthanum yttrium iron garnet Y3.0-XLaXFe5O12 (where x = 0, 0.5 ,1.0, 1.5 , 2.0, 2.5, 3.0 ) were synthesized by conventional solid state technique. We used simple casting technique to fabricate the Y3.0XLaXFe5O12-PVA composite. The samples were mixed with PVA solution to form composite suspension. The single phase of the yttrium iron garnet and lanthanum iron garnet were identified by using X-Ray diffraction analysis. Scanning Electron Microscope (SEM) revealed that the lanthanum based garnet have much smaller grains when compared to the yttrium based garnets. The 0.5 mole fraction of lanthanum substitute in the dodecahedron sub-lattices were found to be exhibit the highest initial permeability values. the highest Q-factor value occurs from the sample Y2.0La1.0Fe5O12. Atomic Force Microscope (AFM) was used to observe the surface morphology of the composite samples. The relative permittivity was measured for YIG-PVA composite with different weight ratio of the YIG, the results shows that relative permittivity decreases with increasing frequency. The YIG-PVA composite was used as an electromagnetic detector to detect EM waves emitting from a transmitter. The composite with 0.6g weight ratio show high voltage detection at 15 MHz frequency. Index Term— Conventional solid state, X-ray diffraction, grain size and initial permeability.