| Popis: |
We synthesized Zn–B–Si–O (ZBSO) nano-composites via sol–gel process, and then used them to dope BaTiO 3 ceramics. The ZBSO nano-composites and their ceramics were characterized by means of thermogravimetric, Fourier-transform infrared, and X-ray diffraction methods, and using scanning and transmission electron microscopy. We also characterized the dielectric properties of the ceramics. The results indicated that the ZBSO nano-composites were nanometer-scale powders with an amorphous structure. The particle size of the powders increased with increasing pH value, but initially decreased and then increased with increasing calcining temperature. At pH about 2 and with calcining at 400 °C, the nano-composites attained minimum particle size (about 30 nm). The sintering temperature of the BaTiO 3 ceramics could be reduced to 1100 °C by adding 5 wt% of the ZBSO nano-composites. Uniform, fine-grained BaTiO 3 ceramics with a high permittivity ( ɛ r = 2946 and ɛ max = 5072) were obtained by adding nano-composites; these properties were superior to the ZBSO glass doped BaTiO 3 ceramics. |
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