采用传统固相反应法制备了Mg4(Nb2-xSbx)O9陶瓷,研究了该材料的烧结性能、物相结构、显微组织和微波介电性能.X射线衍射结果显示,在x小于或等于1.6的范围内,形成了具有α-Al2O3刚玉型晶体结构的连续固溶体,晶轴长度和晶胞体积均随着锑含量的增加而降低.在x等于2.0时,Mg4Sb2O9的物相结构发生了变化,晶轴长度和晶胞体积也发生了突变.当0.4≤x≤O.8时,陶瓷的烧结温度从1400℃降低到了1300℃;而当x≥1.2后,陶瓷的烧结性能和微波介电性能均降低.在1300℃,5h的烧结条件下,Mg4(Nb1.6Sb0.4)O9陶瓷的微波介电常数(εr)为12.26,Q·f为168450 GHz.
参考文献
| [1] | Lee H J;Kaf I T;Hong K S .Dielectric properties of AB2O6 compounds at microwave frequencies (A = Ca, Mg, Mn, Co,Ni, Zn, and B =Nb, Ta)[J].Japanese Journal of Applied Physics,1997,36:L1318-L1320. |
| [2] | Jeong-Ho S;Inaguma Y;Sang-Ok Yoon et al.Microwave dielectric characteristics of ilmenite-type titanates with high Q values[J].Japanese Journal of Applied Physics,1994,33:5466-5470. |
| [3] | 曲远方.功能陶瓷及应用[M].北京:化学工业出版社,2003:138-144. |
| [4] | Kumada N;Taki K;Kinomura N .Single crystal structure refinement of a magnesium niobium oxide: Mg4Nb2O9[J].Materials Research Bulletin,2000,35(07):1017-1021. |
| [5] | Ogawa H;Kan S;Ishihara S et al.Crystal structure of corundum type Mg4(Nb2-xTax)O9 microwave dielectric ceramics with low dielectric loss[J].Journal of the European Ceramic Society,2003,23(14):2485-2488. |
| [6] | Hakki B W;Coleman P D .A dielectric resonator method of measuring inductive in the millimeter range[J].IEEE Transactions on Microwave theory and Techniques,1960,8(04):402-410. |
| [7] | Yoshida A;Ogawa H;Kan A et al.Influence of Zn and Ni substitutions for Mg on dielectric properties of (Mg4-xMx)(Nb2-ySb y)O9 (M = Zn and Ni) solid solutions[J].Journal of the European Ceramic Society,2004,24:1765-1768. |
| [8] | PENN S J;Alford N M;Templeton A et al.Effect of porosity and grain size on the microwave dielectric properties of sintered alumina[J].Journal of the American Ceramic Society,1997,80(07):1885-1888. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%