采用草酸盐共沉淀工艺制备高反应活性Ba_(0.6)Sr_(0.4)TiO_3(BST)粉体,添加适量的B_2O_3-SiO_2-Li_2O(BSL)为烧结助剂,采用传统陶瓷制备工艺制备BST-BSL复相陶瓷.用扫描电镜(SEM)和X射线衍射(XRD)分别研究BST-BSL的微观形貌和相组成,并测试BST-BSL的介电性能参数.结果表明:添加的少量B_2O_3-Li_2O-SiO_2在烧结过程中与BST主晶相发生复杂的化学反应,使BST的烧结温度由1 350℃降低到1 000℃以下;B_2O_3-Li_2O-SiO_2的添加大幅改善BST的介电常数温度稳定性,引入的非铁电第二相对BST铁电性的'稀释作用'使BST-BSL的可调率降低,但由于烧结助剂的添加量少,使BST-BSL在1 kV/mm外加偏场下的可调率仍在5%以上.
The barium strontium titanate(Ba_(0.6)Sr_(0.4)TiO_3,BST)powders with high activity were prepared by oxalate co-precipitation method.The barium strontium titanate composites(BST-BSL)doped by B_2O_3-SiO_2-Li_2O(BSL)were obtained by traditional solid phase method.Their structures and morphology were characterized by XRD and SEM.Experimental results show that the BST-BSL composites can be sintered at below 1 000 ℃.BST-BSL composites possess better permittivity-temperature character.However,the tunability of BST-BSL was decreased to 5%(measured at 1 Kv/mm)due to the nonferroelectric dilution effect of B_2O_3-SiO_2-Li_2O.
参考文献
| [1] | HU T;JANTUNEN H;UUSIMAKI A.Ba_(0.7)Sr_(0.3)TiO_3 powders with B_2O_3 additive prepared by the sol-gel method for use as microwave material[J].Mater Sci in Semi Proc,2003(05):215-221. |
| [2] | K.A. Razak;A. Asadov;W. Gao .Properties of BST ceramics prepared by high temperature hydrothermal process[J].CERAMICS INTERNATIONAL,2007(8):1495-1502. |
| [3] | K.A. Razak;A. Asadov;J. Yoo .Structural and dielectric properties of barium strontium titanate produced by high temperature hydrothermal method[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):19-23. |
| [4] | Matjaz Valant;Danilo Suvorov .Low-Temperature Sintering of (Ba_(0.6)Sr_(0.4))TiO_3[J].Journal of the American Ceramic Society,2004(7):1222-1226. |
| [5] | Sining Yun;Xiaoli Wang;Delong Xu .Influence of processing parameters on the structure and properties of barium strontium titanate ceramics[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2008(8/9):1989-1995. |
| [6] | J. Takahashi;H. Nakano;K. Kageyama .Fabrication and dielectric properties of barium titanate-based glass ceramics for tunable microwave LTCC application[J].Journal of the European Ceramic Society,2006(10/11):2123-2127. |
| [7] | Matjaz Valant;Danilo Suvorov;Robert C. Pullar .A mechanism for low-temperature sintering[J].Journal of the European Ceramic Society,2006(13):2777-2783. |
| [8] | YOU H;KOH J .Structural and electrical properties of low temperature sintered Li_2CO_3 doped(Ba,Sr)TiO_3[J].Ceramics Japan Society of Applied Physics,2006,45(8A):6362-6364. |
| [9] | Se-Ho Kim;Jung-Hyuk Koh .ZnBO-doped (Ba, Sr)TiO3 ceramics for the low-temperature sintering process[J].Journal of the European Ceramic Society,2008(15):2969-2973. |
| [10] | WANG H;WANG X L;YAO X .Phase transformation and phase distribution of pyrochlore structure in Bi_2O_3-ZnO-Nb_2O_5 system[J].IEEE,1996,2(18/21):787-790. |
| [11] | JOHNSON D A .Microwave properties of ceramic nonlinear dielectrics.[ML Report,No.825][R].Microwave Laboratory,Standford University,Standford,CA,1961. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%