采用固相反应法制备了Ba4Sm9.33Ti18O54(简称BST)·xwt％Al2O3(x=0～1.5)微波介质陶瓷.研究了掺杂Al2O3对BST陶瓷的显微结构和介电性能的影响.扫描电镜和能谱分析结果显示:未掺杂的BST陶瓷中有少量Sm2Ti2O7相,随着增加Al2O3掺入量,Sm2Ti2O7相消失,BST陶瓷中先后产生了BaTi4O9(x≥0.6)和BaAl2Ti5O14(x≥1.0)两种新相.介电性能测试结果表明Sm2Ti2O7相的消失以及少量BaTi4O9相的形成,能显著提高BST陶瓷的Qf值,但会降低陶瓷的介电常数.当Al2O3的掺入量从0.6wt％增加到1.0wt％时,BaTi4O9相的量逐渐增加,引起BST陶瓷的Qf值略微下降.BaAl2Ti5O14相的产生会同时降低BST陶瓷的介电常数和Qf值.掺入0.6wt％Al2O3的BST陶瓷在1340℃烧结3h后具有最佳的介电性能:εr=74.7,Qf=10980GHz,rf=-11.8× 106/℃.
参考文献
| [1] | Reaney I M,Iddles D.Microwave dielectric ceramics for resonators and filters in mobile phone networks.J.Am.Ceram.Soc.,2006,89(7):2063-2072. |
| [2] | Wersing W.Microwave ceramics for resonators and filters.Curr.Opin.Solid State Mater Sci.,1996,1(5):715-731. |
| [3] | Iqbal Y,Manan A,,Reaney I M.Low loss Sr1-xCaxLa4Ti5O17 microwave dielectric ceramics.Mater.Res.Bull.,2011,46(7):1092-1096. |
| [4] | 波扎.微波工程,3版.北京:电子工业出版社,2006. |
| [5] | Bahel S,Narang S B.Optimization of dielectric properties of barium rare earth titanate by complex substitution.Ceram.Int.,2010,36:251-255. |
| [6] | Yu X H,Zhou D X,Gong S P.Development of BaO-Ln2O3-TiO2 microwave dielectric cerammics.Materials Review,2007,21(2):30-33. |
| [7] | Ohsato H,Ohhashi T,et al.Microwave dielectric properties and structure of the Ba6-3xSm8+2xTi18O54 solid solution.Jpn.J.Appl.Phys,1995,34:187-191. |
| [8] | Ohsato H.Science of tungstenbronze-type like Ba6-3xR8+2xTi18O54 (R=rare earth) microwave dielectric solid solutions.J.Euro.Ceram.Soc.,2001,21:2703-2711. |
| [9] | Chen X M,Li Y.A-and B site cosubstituted Ba6-3xSm8+2xTi18O54 microwave dielectric ceramics.J.Am.Ceram.Soc.,2002,85(3):579-584. |
| [10] | Yao X G,Lin H X,Chen W,et al.Anti-reduction of Ti4+ in Ba4.2Sm9.2Ti18O54 ceramics by doping with MgO,Al2O3 and MnO2.Ceram.Int.,2012,38(4):3011-3016. |
| [11] | Mizuta M,Oshato H,Uenoyamo K,et al.Formation of tungsten bronze-type (Ba6-3xSm8+2x)αTi18-yAlyO54(α=1+y/36) solid solutions and microwave dielectric properties.Jpn.J.Appl.Phys.,1996,35:5065-5068. |
| [12] | Shannon R D.Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides.Acta Cryst.A,1976,32(5):751-767. |
| [13] | Mhaisalkar S G,Readey D W,Akbar S A.Microwave dielectric properties of doped BaTi4O9.J.Am.Ceram.Soc.,1991,78(4):1894-1898. |
| [14] | Wu J M,Chang M C,Yao P C.Reaction sequence and effects of calcination and sintering on microwave properties of (Ba,Sr)O-Sm2O3-TiO2 Ceramics.J.Am.Ceram.Soc.,1990,73(6):1599-1605. |
| [15] | 姜建华.无机非金属材料工艺原理.北京:化学工业出版社,2005. |
| [16] | Guo M,Gong S P,et al.A new temperature stable microwave dielectric ceramics:ZnTiNb2O8 sintered at low temperatures.J.Alloys Compd.,2011,509(20):5988-5995. |
| [17] | Li M,Feteira A,Mirsaneh M,et al.Influence of nonstoichiometry on extrinsic electrical conduction and microwave dielectric loss of BaCo1/3Nb2/3O3 ceramics.J.Am.Ceram.Soc.,2010,93(12):4087-4095. |
| [18] | Lyashenko L P,Belov D A,Shcherbakova L G.Conductivity of Sm2TiO5 and Sm2Ti2O7.Inorg.Mater.,2008,44(12):1349-1353. |
| [19] | Mhaisalker S G,Readey D W,Akbar S A.Microwave dielectric properties of doped BaTi4O9.J.Am.Ceram.Soc.,1991,74(8):1894-1898. |
| [20] | Ubic R,Reaney I M,Lee W E.Microwave dielectric properties of solid-solution phase in system BaO-Ln2O3-TiO2(Ln=Lanthanide cation).Int.Mater.Rev.,1998,43(5):205-219. |
| [21] | Reaney I M,Ubic R.Dielectric and structural characteristics of perovskites and related materials as a function of tolerance factor.Ferroelectrics,1999,228(1):23-38. |
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%