Characterization and Microwave Absorption Properties of Lead-Free Bi0.5(Na0.80K0.20)0.5TiO3 Synthesized by Sol-Gel Method
Main Article Content
Abstract
Lead-free Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT) particles were synthesized by using sol-gel method. The samples were investigated by X-ray diffractometry (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and vibrating sample magnetometer (VSM). The absorption of microwaves of the lead-free BNKT powders is determined from the magnetic (permeability) and dielectric (permittivity) properties at the frequency range from 2 to 18 GHz. Absorption characteristics of paraffin(wax)-mixed BNKT compounds at different sample thicknesses were also investigated. The microwave absorption properties show that the maximum reflection loss is -21.72 dB (99.9%) at 13.66 GHz with a thickness of 3.2 mm. BNKT composites are thought to be used as a promising microwave absorption material.
Keywords:
BNKT, microwave absorption, reflection loss, sol-gel.
References
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[13] P. Chen, S. Wu, P. Li, J. Zhai, B. Shen, The Phase Formation Process of Bi0.5(Na0.8K0.2)0.5TiO3 Thin Films Prepared Using the Sol-Gel Method, Ceram. Int., Vol. 44, No. 6, 2018, pp. 6402-6408, https://doi.org/10.1016/j.ceramint.2018.01.034.
[14] J. Camargo, L. Ramajo, F. R. Marcos, M. Castro, Ferroelectric Properties of Bi0.5(Na0.8K0.2)0.5TiO3 Ceramics, Adv. Mater. Res., Vol. 975, 2014, pp. 3-8, https://doi.org/10.4028/www.scientific.net/AMR.975.3.
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[27] M. Khairy, Synthesis, Characterization, Magnetic and Eclectrical Properties of Polyaniline/NiFe2O4 Nanocomposite, Synth. Metal., Vol. 189, 2014, pp. 34-41, https://doi.org/10.1016/j.synthmet.2013.12.022.
[28] K. Sakai, K. Hiraki, S. Yoshikado, Evaluation of Composite Electromagnetic Wave Absorber Made of Isolated Ni-Zn Ferrite or Permalloy, Electron. Comm. Jpn., Vol. 92, No. 5, 2009, pp. 14-22, https://doi.org/10.1002/ecj.10045.
[29] S. M. Abbas, A. K. Dixit, R. Chatterjee, T. C. Goel, Complex Permittivity and Microwave Absorption Properties of BaTiO3–Polyaniline Composite, Mater. Sci. Eng. B, Vol. 123, No. 2, 2005, pp. 167-171, https://doi.org/10.1016/j.mseb.2005.07.018.
[30] Y. F. Zhu, L. Zhang, T. Natsuki, Y. Q. Fu, Q. Q. Ni, Facile Synthesis of BaTiO3 Nanotubes and Their Microwave Absorption Properties, ACS Appl. Mater. Interfaces., Vol. 4, No. 4, 2012, pp. 2101-2106, https://doi.org/10.1021/am300069x.
[31] Y. Akinay, F. Hayat, Y. Kanbur, H. Gokkaya, S. Polat, Comparison of Microwave Absorption Properties between BaTiO3/Epoxy and NiFe2O4/Epoxy Composites, Polym. Compos., Vol. 39, No. S4, 2017, pp. E2143-E2148, https://doi.org/10.1002/pc.24497.
[32] Y. B. Zainal, Dedi, A. Manaf, Microstructure and Microwave Absorption Characteristics of BaTiO3-CoFe2O4 Composites, Key Eng. Mater., Vol. 855, 2020, pp. 322-329, https://doi.org/10.4028/www.scientific.net/KEM.855.322.