Study of (1?x)ZnAl2O4–xSiO2 spinel structures as microwave dielectric materials |
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Authors: | Mohd Syafiq Zulfakar Huda Abdullah Wan Nasarudin Wan Jalal Zalita Zainuddin Sarada Idris |
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Institution: | 1. Department of Electrical, Electronic and System Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia 2. Faculty of Science and Technology, School of Applied Physics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia 3. Malaysian Nuclear Agency (Nuclear Malaysia), 43000, Kajang, Selangor, Malaysia
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Abstract: | Sol–gel method was used to synthesize zinc aluminate (ZnAl2O4) dispersed into silica matrix with different compositions of x. Morphological structure of (1?x)ZnAl2O4–xSiO2 samples were investigated by field emission scanning electron microscope (FESEM) and X-ray diffractometer (XRD). The FESEM images showed spherical structures and agglomerated particles occurred inside the samples. XRD analysis indicated the cubic phase formation of the samples. The crystallite size, D was calculated and it was found that the crystallite size are slightly increased from 8 to 17 nm. FTIR spectra analysis shows that the water presence in the samples and also the presence of nitrate group. The dielectric properties have been measured, ε r value was found to be around 13.0. The S11 parameter analysis shows the samples was resonated at 2.40 GHz and gives different values of bandwidth for microstrip patch antenna application. |
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