Abstract
Synthesis and characterization of (Ba,Sr)0.5Fe12-xZnxTixO19 M-type hexaferrite was conducted by using mechanochemical process. The composition of Zn-Ti ion in (Ba,Sr)0.5Fe12- xZnxTixO19 M-type hexaferrite were varied as x = 0.0, 0.2, 0.6, and 1.0. The sample was characterized by using X-rays diffractometer (XRD), scanning electron microscope (SEM), vibrating sample magnetometer (VSM), and vector network analyzer (VNA). The XRD patterns were further analyzed by Rietveld analysis program. The Rietveld analysis result indicated that the substitution of Zn-Ti ions led to the expansion of the hexagonal lattice parameter and unit cell volume (Vcell), while the atomic density decreased with increasing of the Zn-Ti ion. The VSM measurement exhibited that the substitution of the Zn-Ti ions caused the change in magnetic properties behavior such as intrinsic magnetic coercivity (Hci), remanence (Mr) and saturation (Ms) magnetization. The value of Hc dropped significantly with the substitution of Zn-Ti ions, and then continued to decrease with the addition of Zn-Ti ions content for x = 0.6, and x = 1.0. SEM observation revealed that all the particles showed nearly hexagonal platelet shape, with the particle size distribution at most in the range between 200–600 nm. The variation of the reflection loss versus frequency was measured by using VNA in (Ba,Sr)0.5Fe12-x(ZnTi)xO19 hexaferrite for x = 0.0–1.0. The optimum reflection loss (RL) was found to be –48 dB at 14 GHz in (Ba,Sr)0.5Fe11.6(ZnTi)0.2O19 hexaferrite for x = 0.2.
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