Full
CHEN Zheng (1993-), male, Master candidate. E-mail: chenzheng13@126.com
Outline
A [Pb(Zr0.53Ti0.47)O3](PZT) sol was prepared by Sol-gel method, and the stability of PZT sol was tracked and characterized for 120 days. Through the pH value evolving with time test, it was found that the pH value was kept in the range of 4.81 to 5.52. The analysis showed that particle size distribution ranged from 1.3 to 17.1 nm, and Zeta potential ranged from -10.23 to -17.57 mV, which indicates the prepared PZT sol had good storage stability. By means of thermogravimetry-differential scanning calorimetry, thermogravimetric infrared analysis, X-ray diffraction and X-ray energy spectrum analysis, it is found that the thermal decomposition process of PZT sol can be divided into three stages; According to transmission electron microscopy (TEM) and selected area electron diffraction (SAED) analysis, it can be seen that the exposed crystal face groups of the heat-treated products are (110) and (101). Finally, the thermal decomposition mechanism and kinetics of PZT sol were studied by thermogravimetry-derivative thermogravimetry method, combined with Flynn-Wall-Ozawa method, Achar method and Satava method, the results show that: the activation energy in the first stage Eα=58.24 kJ·mol-1, following the first-order Mample single-line rule; the activation energy in the second stage Eα=171.46 kJ·mol-1, following three-dimensional diffusion (Jander); and the activation energy in the third stage Eα=319.56 kJ·mol-1, following the phase boundary reaction shrinkage cylinder rule.
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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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