Full
LIU Jianke (1966-), male, Ph.D., Professor. E-mail: liujk@sust.edu.cn
Outline
ZnO-Bi2O3-MnO2-Cr2O3 varistor ceramics doped with different amounts of silicon dioxide (SiO2) were prepared by a conventional solid-phase sintering method. The phase composition and microstructure of the samples were investigated by X-ray diffraction and scanning electron microscopy. The electrical properties were measured by sourcemetry and inductance capacitance resistance, and the double Schottky barrier parameters were measured by a capacitance-voltage characteristic method. The results show that when the frequency is near 105 Hz, the relative dielectric constant (εr) decreases rapidly since the polarization cannot change with the frequency of electric field, resulting in the corresponding loss peak. The loss peak (tanδ) firstly decreases and then increases with the increase of the doping amount, and its maximum tanδ is obtained witrhout SiO2 and the minimum tanδ is achieved at 1.0% SiO2. The value of tanδ at a frequency of 105 Hz is reduced by doping SiO2. The nonlinear coefficient firstly increases and then decreases with the increase of SiO2 doping amount. The value of α reaches 43.36, the value of φb is 1.98 eV at 10 kHz, the donor concentration is 2.97×1024 m-3, and the leakage current IL is 0.31 μA/cm2 at SiO2 doping amount of 1.0%.
31
8
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
