DING Yi (1999-), male, Undergraduate. E-mail: balalahippotamus@163.com
The La0.5Sr0.5CoO3(LSCO) oxide bottom electrodes were epitaxially grown on (001) SrTiO3(STO) substrates via off-axis magnetron sputtering at different deposition temperatures. Based on the results of X ray diffraction (XRD), atomic force microscopy (AFM) and four probe square resistance test, the optimal deposition temperature for (00l) epitaxial LSCO films is 550℃. In addition, the Pt/Na0.5Bi0.5TiO3(NBT)/LSCO/STO ferroelectric capacitor was fabricated on LSCO/STO heterostructure via laser pulse deposition. The results indicate that NBT films are (00l) epitaxial. The leakage current density of Pt/NBT/LSCO heterostructure increases with increasing temperature from room temperature to 70℃. The conduction mechanism is ohmic conduction at low voltage and space charge limited current at a high voltage. At 5 V driving voltage, the Pt/NBT/LSCO capacitor exhibits saturated hysteresis loops and retention characteristics both at room temperature and 70℃ without fatigue after 1010 inversion.
| 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 |