| Ni@BaTiO3 and3 BNNi @@BaTiO nanocapsules were prepared by hydrolysis precipitation method.The chemical composition,structure and absorbing properties of the samples were analyzed by X-ray diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?transmission electron microscopy?TEM?and vector network analyzer.The results show that the particle size of Ni @ BaTiO3 nanocapsules prepared by hydrolysis precipitation-DC arc method is about 4-16 nm,and its shell thickness is about 4-6nm.The results show that the absorption coefficient of Ni @ BaTiO3 is2.-18 GHz and the corresponding thickness range is 1.7-5.5mm.The optimum reflection loss is-42.3 dB at 10.6 GHz and the corresponding thickness is 1.88 mm.Ni @ BaTi O3 nanosized samples have different absorption peaks and frequency widths due to their thickness,and the absorption peak moves toward the low frequency as the simulated thickness increases.Ni @ BN @ BaTiO3 nanocapsules were prepared by hydrolysis precipitation method.The particle size was 30-100 nm,and the maximum reflection loss of Ni @BN @ BaTi O3 samples appeared in the Ni @ BN @ BaTiO3 nanocapsules prepared by the direct current arc method.12.725 GHz corresponding reflection loss-30.83 dB corresponding to the thickness of 7.4 mm.By comparison,it is found that the same sample thickness is selected in the Ku-band,Ni @ BN @ BaTiO3 is larger than Ni @BN and the reflection loss is large and moves to the low frequency direction.The results show that the nanocapsules prepared by Ba Ti O3 nanocomposite materials with high dielectric constant,ferroelectricity,piezoelectricity and insulating properties can change the electromagnetic parameters of single magnetic nanoparticles.At the same time,the dielectric loss of Ba TiO3 and the magnetic loss of the magnetic transition metal increase the absorption and attenuation of the electromagnetic wave prepared by the nanocapsules,and enhance the absorbing performance. |
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