采用固相反应法制备了(Ba1-xSrx)La4Ti4O15(x=0.8～0.95)复合体系微波介质陶瓷,并对其进行物相组成、晶体结构分析以及微波介电性能的研究.研究结果表明,(Ba1-xSrx)La4Ti4O15陶瓷主晶相为SrLa4Ti4O15,并伴随有第二相SrLa8Ti9O15.SEM观察表明,Ba0.2Sr0.8La4Ti4O15陶瓷内部微观结构致密,晶粒尺寸在10～20 μm之间,晶界清晰.随着x值逐渐增大,(Ba1-xSrx)La4Ti4O15陶瓷中晶粒形态发生变化,气孔增多.在x=0.8时,(Ba1-xSrx)La4Ti4O15陶瓷具有优良的微波介电性能,即εr=40.86,Q×f≈62806 GHz,τf=-20×10-6/℃.随着Ba2+的含量逐渐增加,该陶瓷的介电常数εr单调上升,品质因子Q×f值增加,说明适量的Ba2+替代Sr2+能改善陶瓷的微波介电性能.
参考文献
| [1] | Jawahar N,Santha N,Sebastian M,et al.Microwave dielectric properties of MO-La2O3-TiO2 (M=Ca,Sr,Ba) ceramics.J.Mater.Res.,2002,17(12):3084-3089. |
| [2] | Zheng J,Zhang C,Xiong Z,et al.Influence of CuO or MnCO3 additive on the dielectric properties of Ca0.65Ti0.65La0.35Al0.35O3 ceramics.Journal of Physics:Conference Series,2009,152(1):012062-1-8. |
| [3] | Pei J,Yue Z,Zhao F,et al.Microwave dielectric ceramics of hexagonal (Ba1-xAx) La4Ti4O15 (A=Sr,Ca) for base station applications.Journal of Alloys and Compounds,2008,459(1/2):390-394. |
| [4] | Tohdo Y,Kakimoto K,Ohsato H,et al.Microwave dielectric properties and crystal structure of homologous compounds ALa4Ti4O15 (A=Ba,Sr and Ca) for base station applications.Journal of the European Ceramic Society,2006,26(10/11):2039-2043. |
| [5] | Vineis C,Davies T.Microwave dielectric properties of hexagonal perovskites.Materials Research Bulletin,1996,31(5):431-437. |
| [6] | Xiao Y,Chen X,Liu X.Stability and microwave dielectric characteristics of (Ca1-xSrx)LaAlO4 ceramics.Journal of Electroceramics,2008,21(1):154-159. |
| [7] | Nenasheva E,Kartenko N.High dielectric constant microwave ceramics.Journal of the European Ceramic Society,2001,21(15):2697-2701. |
| [8] | 吕文中,王红玲.高δr微波介质陶瓷的结构.介电性质及其研究进展.功能材料,2000,31(6):572-576. |
| [9] | Ohsato H.Research and development of microwave dielectric ceramics for wireless communications.Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi,2005,113(11):703-711. |
| [10] | Jancar B,Suvorov D,Valant M.Microwave dielectric properties and microstructural characteristics of aliovalently doped perovskite ceramics based on CaTiO3.Key Engineering Materials,2002,206-213:1289-1292. |
| [11] | Khalyavin D D,Salak A N,Senos A M R,et al.Structure sequence in the CaTiO3-LaAlO3 Microwave ceramics-revised.Journal of the American Ceramic Society,2006,89(5):1721-1723. |
| [12] | Liu X,Chen X.Microstructures and dielectric properties of CaTiO3-LaSrAlO4 composite ceramics.Materials Science and Engineering:B,2004,110(3):296-301. |
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