BST-BSL体系的烧结行为和介电性能Sintering behavior and dielectric property of BST-BSL composite ceramics
李明利;杜丕一;纪松;钱坤明;周宇松;
摘要(Abstract):
采用草酸盐共沉淀工艺制备高反应活性Ba0.6Sr0.4TiO3(BST)粉体,添加适量的B2O3-SiO2-Li2O(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B2O3-Li2O-SiO2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;B2O3-Li2O-SiO2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。
关键词(KeyWords): 钛酸锶钡;复相陶瓷;微观形貌;介电性能
基金项目(Foundation): 宁波市自然科学基金项目(2009A610040);; 第46批博士后资助基金项目(20090461406)
作者(Author): 李明利;杜丕一;纪松;钱坤明;周宇松;
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DOI: 10.14024/j.cnki.1004-244x.2010.02.021
参考文献(References):
- [1]HU T,JANTUNEN H,UUSIMAKI A,et a1.Ba0.7Sr0.3TiO3 powderswith B2O3 additive prepared by the sol-gel method for use as mi-crowave material[J].Mater Sci in Semi Proc,2003(5):215-221.
- [2]RAZAK K A,ASADOV A,GAO W.Properties of BST ceramicsprepared by high temperature hydrothermal process[J].Ceram-ics International,2007,33(8):1495-1502.
- [3]RAZAK K A,ASADOV A,YOO J,et a1.Structural and dielectricproperties of barium strontium titanate produced by hightemperature hydrothermal method[J].Journal of Alloys andCompounds,2008,449(1/2):19-23.
- [4]MATJAZ VALANT,DANLO SUVOROV.Low-temperature sin-tering of(Ba0.6Sr0.4)TiO3[J].J Am Ceram Soc,2004,87(7):l222-1226.
- [5]YUN S,WANG X L,XU D L.Influence of processing parameterson the structure and properties of barium strontium titanateceramics[J].Materials Research Bulletin,2008,43(8/9):1989-1995.
- [6]TAKAHASHI J,NAKANOA H,KAGEYAMA K.Fabrication anddielectric properties of barium titanate-based glass ceramics fortunable microwave LTCC application[J].Journal of theEuropean Ceramic Society,2006,26:2123-2127.
- [7]MATJAZ V,DANLO S,ROBERT C Pullar.A mechanism for low-temperature sintering[J].Journal of the European CeramicSociety,2006,26:2777-2783.
- [8]YOU H,KOH J.Structural and electrical properties of lowtemperature sintered Li2CO3 doped(Ba,Sr)TiO3[J].CeramicsJapan Society of Applied Physics,2006,45(8A):6362-6364.
- [9]KIM S,KOH J.ZnBO-doped(Ba,Sr)TiO3 ceramics for the low-temperature sintering process[J].Journal of the EuropeanCeramic Society,2008,28(15):2969-2973.
- [10]WANG H,WANG X L,YAO X.Phase transformation and phasedistribution of pyrochlore structure in Bi2O3-ZnO-Nb2O5 system[J].IEEE,1996,2(18/21):787-790.
- [11]JOHNSON D A.Microwave properties of ceramic nonlineardielectrics[R].ML Report,No.825,Microwave Laboratory,Standford University,Standford,CA,1961.