JIANG Yujian (1995-), male, Master candidate. E-mail: 764537250@qq.com
(Li0.5Bi0.5)xBa1-xBi8Ti7O27 intergrowth bismuth layered structure lead-free piezoelectric ceramics were prepared by a solid-state reaction method. (Li0.5Bi0.5)2+ co-doping can replace Ba2+ doping at A site in the system to regulate the crystal structure as well as increase the Curie temperature and the application range in the high-temperature field. The introduction of (Li0.5Bi0.5)2+increases the piezoelectric constant d33 from 8 to 18.5 pC/N, and the Curie temperature from 480 to 633 ℃. Based on the result of XRD and Raman spectra, the degree of orthogonal distortion increases. The hysteresis loops show that the remanent polarization is related to the structural distortion, and the piezoelectric constant changes in the same way. (Li0.5Bi0.5)0.6Ba0.4Bi8Ti7O27 ceramics with the optimum comprehensive electrical properties can be used as a potential candidate material for high- temperature piezoelectric field.
| 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 |