ZHU Hui (1994-), female, Master candidate. E-mail: 837275842@qq.com
(Sr1-xZnx)Al2Si2O8 (x=0, 0.005, 0.010, 0.030, 0.060) microwave dielectric ceramic was prepared by a solid-phase sintering method. The effect of Zn2+ doping content on the crystal structure and microwave dielectric properties of SrAl2Si2O8 (SAS) ceramic was investigated. The site (Sr2+ or Al3+) was determined by the first-principle calculation to confirm the site occupied by Zn2+. The result shows that Zn2+ substitution can increase SAS Q×f value (from 37 502 GHz to the maximum value of 48 252 GHz), and improve the density and τf value. The (Sr0.99Zn0.01)Al2Si2O8 ceramic sintered at 1 500℃ for 5 h has excellent microwave dielectric properties(i.e., εr=7.0, Q×f=48 252 GHz, τf= -36.35×10-6/℃).
| 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 |