BaO-La2O3-TiO2(BLT)是典型的高介电常数微波介质陶瓷,其作为微波谐振器与滤波器的关键材料,在微波通讯技术上有着重要的应用. 选用ZrO2对BLT进行改性研究,当ZrO2的加入量z＜0.5mol时,烧结体的主晶相为Ba6-3xLa8+2x(Ti1-zZrz)18O54(x=1/2)钨青铜结构(TB)固溶体,随ZrO2加入量的增多,烧结体中产生第二相,当z＝1.0mol时,烧结体的主晶相为La2Zr2O7和BaZrO3,这与结构许容因子的变化密切相关,获得较优介电性能如下:εr=103.71,Q·f=4862.53 GHz,τf=168.97×10-6/℃,优于不添加ZrO2时烧结体介电性能(εr=139.73,Q·f=1238.96 GHz,τf=179.97×10-6/℃) ,说明少量ZrO2的加入可以改善BLT陶瓷的品质因数和频率温度系数,略降低介电常数. SEM分析表明,少量ZrO2的加入没有改变烧结体的微观形貌,改性前后烧结体内部均为典型的柱状TB固溶体形貌.
参考文献
| [1] | Jeoog Seog Kim;Chan II Cheon .Dielectric properties and crystal structure of Ba6-3x(Nd,M)8+2xTi18O54(M=La,Bi,Y) microwave ceramics[J].Journal of Materials Science,2000,35:1487. |
| [2] | Suknleen Bindra Narang;Dalveer Kaur .Dielectric properties of lanthanum substituted barium titanate microwave ceramics[J].Materials Letters,2006,60:3179. |
| [3] | Li Bin,Zhang Qitu.Study on BaO-Sm2O3-TiO2 Microwave Dielectric Ceramics Doped with Bismuth and Zinc[J].稀土学报（英文版）,2006(z2):231-233. |
| [4] | Qin Ni;Liu Xiaoqiang;Chen Xiangming .Thermal expansion and high-temperature phase transition of Ba6-3xR8+2xTi18O54(Ln=La,Nd and Sm) Ceramics[J].Journal of the American Ceramic Society,2007,90:2912. |
| [5] | Hitoshi Ohsato;Masaki Imaeda .The quality factor of the microwave dielectric materials based on the crystal structure-as an example:the Ba6-3xR8+2xTi18O54(R=rare earth) solid solutions[J].Materials Chemistry and Physics,2003,79:208. |
| [6] | Chen Xiangming;Li Yi .A and B site cosubstituted Ba6-3xSm8+2xTi18O54 microwave ceramics[J].Journal of the American Ceramic Society,2002,85(03):579. |
| [7] | Wu Yongjun;Chen Xiangming .Bismuth/Samarium cosubstitude Ba6-3xNd8+2xTi18O54 microwave dielectric ceramics[J].Journal of the American Ceramic Society,2000,83(07):1837. |
| [8] | 王浩,陈文,田中青.La3+,Sr2+置换对Ca[（Mg1/3Nb2/3）0.6Ti0.4]O3陶瓷微波介电性能的影响[J].中国稀土学报,2006(01):52-55. |
| [9] | Zheng X H;Chen X M .Dielectric ceramics with tungsten-bronze structure in the BaO-Nd2O3-TiO2-Nb2O5 system[J].Journal of Materials Research,2002,17:1664. |
| [10] | 吕文中,张道礼,黎步银.高εr微波介质陶瓷的结构、介电性质及其研究进展[J].功能材料,2000(06):572. |
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%