The effect of B2O3 dopant and SrTiO3 (ST) content on lattice parameters and ferro-paraelectric phase transition temperature (i.e. Curie point) of Ba1-xSrxTiO3 (BST, x=0～0.4) ceramics was investigated, and then BST graded ceramics with controllable transition temperature zone were fabricated and characterized for their dielectric properties. The results show that with the increase of ST content, c/a ratio and Curie point of both doped and undoped ceramics decreased linearly but with different rate of change, resulting from different ionic radiuses of Ba2+, Sr2+ and B3+. Moreover, both c/a ratio and Curie point of doped BST increased slightly in comparison with that of undoped ones while the Curie point changed scarcely with dopant amount rising, which perhaps means that for BST grains with different ST content, B2O3 solubility was different but limited and most of boron (B) did not incorporate into BST grains. Through controlling composition,transition temperature of graded ceramics can be designed. For doped graded ceramics sintered at 1250℃, its dielectric properties was much better than that of undoped one sintered at 1400℃, and Curie peak of both samples was broadened effectively via graded structure.
参考文献
| [1] | R.Varatharajan;S.Madeswaran;R.Jayavel .Nb:BST:Crystal growth and ferroelectric properties[J].Journal of Crystal Growth,2001(2/4):484-488. |
| [2] | Chen Y C;Wu L;Chou Y P et al.Curve-fitting of direct-current field dependence of dielectric constant and loss factor of Al2O3-doped barium strontium titanate[J].Materials Science and Engineering,2000,B76:95-100. |
| [3] | Jang S I;Jang H M .Leakage-current characteristics of sol-gel-derived BST thin films[J].Ceramics International,2000,26:421-425. |
| [4] | T. Hu;H. Jantunen;A. Uusimaki;S. Leppavuori .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].Materials science in semiconductor processing,2002(2/3):215-221. |
| [5] | Sung Min Rhim;Heungjin Bak .Effects of Heating Rate on the Sintering Behavior and the Dielectric Properties of Ba_(0.7)Sr_(0.3)TiO_3 Ceramics Prepared by Boron-Containing Liquid-Phase Sintering[J].Journal of the American Ceramic Society,2000(12):3009-3013. |
| [6] | Ho I C .Semiconducting barium titanate ceramics prepared by boron-containing liquid-phase sintering[J].Journal of the American Ceramic Society,1994,77(03):829-832. |
| [7] | Qi J Q;Zhu Q;Wang Y L et al.Enhancement of positive temperature coefficient resistance effect of BaTiO3-based semiconducting ceramics caused by B2O3 vapor dopants[J].Solid State Communications,2001,120:505-508. |
| [8] | Zhu X H;Xu J;Meng Z Y et al.Microdisplacement characteristics and microstructures of functionally graded piezoelectric ceramics actuator[J].Materials & Design,2000,21:561-566. |
| [9] | ZHU J C;Wu S Y;Cheng H R et al.Characterization of(Ba Sr)TiO3 functionally graded dielectric ceramics fabricated from chemical coprecipitated nano-particles[J].Materials Science Forum,2003,423-425:417-422. |
| [10] | RHIM S M;Hong S M;Bak H J et al.Effect of B2O3addition on the dielectric and ferroelectric properties of Ba0 7Sr0 3TiO3 ceramics[J].Journal of the American Ceramic Society,2000,83(05):1145-1148. |
| [11] | Jae-Ho Jeon;Yoo-Dong Hahn;Hai-Doo Kim .Microstructure and dielectric properties of barium-strontium titanate with a functionally graded structure[J].Journal of the European Ceramic Society,2001(10/11):1653-1656. |
| [12] | Cheng H R;Zhu J C;Jeon J H et al.Densification and dielectric property of of B2O3-doped Ba1-xSrxTiO3 graded ceramics[J].无机材料学报,2004,19(05) |
| [13] | King G;Goo E K .Effect of the c/a ratio on the domain structure in (Pb1-x Cax)TiO3[J].Journal of the American Ceramic Society,1990,73(06):1534-1539. |
| [14] | Young-Sik Hong;Hyu-bum Park;Si-Joong Kim .Structural and dielectric properties of lanthanide-modified Pb(Mg1/3Nb2/3)O3 Ceramics[J].Journal of Materials Science Letters,1997(18):1518-1520. |
| [15] | Sun-Gon Jun;Nam-Kyoung Kim .PHASE DEVELOPMENT AND DIELECTRIC PROPERTIES OF THE Pb(Fe(1/2)Nb(1/2)O_3-SUBSTITUTED Pb(Fe(2/3)W(1/3)O_3-Pb(Mg(1/3)Nb(2/3)O_3 SYSTEM[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,1999(4):613-620. |
| [16] | Jun S G;Kim N K .Synthesis and dielectric properties of perovskite ceramics system PFW0 8-x·PMN0 2·PFNx[J].Journal of Materials Science,2000,35:1459-1463. |
| [17] | Vilafinho P M;Zhou L Q;Pockl M et al.Dielectric proerpfies of Pb(Fe2/3W1/3)O3- PbTiO3 solid-solution ceramics[J].Journal of the American Ceramic Society,2000,83(05):1149-1152. |
| [18] | RUZHONG ZUO;LONGTU LI;RENZHENG CHEN .Sintering characteristics and dielectric properties of silver-doped PMN-PZN-PT relaxor ferroelectric ceramics[J].Journal of Materials Science,2000(21):5433-5436. |
| [19] | Zhou T S;He Y B;Shang X Z et al.A new modified PbTiO3 piezoelectric ceramic material[J].无机材料学报,1998,13(04):484-490. |
| [20] | Zhang L.;Wang YG.;Zhang PL.;Zhong WL. .THE CELL VOLUME EFFECT IN BARIUM STRONTIUM TITANATE[J].Solid State Communications,1997(5):263-266. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%