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In the preparation of tetragonal nano-barium titanate powder by traditional solid-phase method, the dispersion and particle size of the BaCO3 precursors play a crucial role in the morphology, particle size, and dielectric properties of the obtained tetragonal BaTiO3 nanoparticles. In this paper, nano BaCO3 powders were prepared by controlling the concentration of the Ba(OH)2 using Ba(OH)2 and drikold as raw materials. Then, BaTiO3 powders and ceramic were prepared using the BaCO3 powders, and the dielectric properties of BaTiO3 ceramic was studied. The results show that the short rod-shaped nano BaCO3 powders with a particle size of 180 nm and the highly dispersed, highly uniform and pure tetragonal BaTiO3 powders with a particle size of 400 nm were prepared. The dielectric constant and dielectric loss factor of the BaTiO3 ceramic obtained by calcination at 1 250℃ is 4 885 and 0.018 9, respectively.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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