研究了(1-x)(0.96Bi_0.5Na_0.5TiO_3-0.04BaTiO_3)-x(0.98K_0.5Na_0.5NbO_3-0.02LiTaO_3)(BNTBT-KNNLT)体系在0≤x≤0.07这一组分区域的结构和性能.X射线衍射谱发现,这一系列组分在室温下形成纯钙钛矿型固溶体,没有其他杂相产生.(111)峰的峰位和峰形随组分的变化有规律的变化.随着KNNLT组分的加入,压电及介电等性能有比较明显的改变.压电性能随KNNLT的加入出现最大值.当x=0.02时,压电常数d_(33)=125 pC/N.介电常数在室温下随组分的增加而增加.电滞回线的结果显示,尽管在BNTBT中掺杂了KNNLT,这一系列的压电陶瓷仍然具有较大的矫顽场.当x=0.02时,室温下介电常数和剩余极化强度分别为:ε_r=1455,P_r=32.3 μC/cm~2.实验结果表明适量的KNNLT掺杂进BNTBT中可以改善BNTBT的压电和介电性能.
Lead-free piezoelectric ceramics (1-x)(0.96Bi_0.5Na_0.5TiO_3-0.04BaTiO_3)-x(0.98K_0.5Na_0.5NbO_3-0.02LiTaO_3) (BNTBT-KNNLT) with x=0-0.07 were synthesized by a conventional sintering technique. All samples present pure perovskite structure, showing room temperature symmetries of rhombohedral at x≤0.03, and of pseudocubic at x≥0.05. The composition 0.98(0.96Bi_0.5Na_0.5TiO_3-0.04BaTiO_3) -0.02(0.98K_0.5Na_0.5NbO_3-0.02LiTaO_3) exhibits the improved properties, which are as follows: piezoelectric constant d_(33)=125 pC/N, dielectric constant ε_r=1455, remanent polarization P_r=32.3 μC/cm~2, and coercive electric field E_c=3.1 kV/mm. The results indicate that the added KNNLT into BNTBT helps to improve the electrical properties of BNT-based ceramics.
参考文献
| [1] | Shrout T R;Zhang S J .[J].Journal of Electroceramics,2007,19:111. |
| [2] | Takenaka T;Maruyama K;Sakata K .[J].Japanese Journal of Applied Physics,1991,30(9B):2236. |
| [3] | Sasaki A;Chiba T;Mamiya Y et al.[J].Japanese Journal of Applied Physics,1999,38:5564. |
| [4] | Nagata H;Yoshida M;Makiuchi Y;Takenaka T .Large piezoelectric constant and high Curie temperature of lead-free piezoelectric ceramic ternary system based on bismuth sodium titanate-bismuth potassium titanate-barium titanate near the morphotropic phase boundary[J].Japanese journal of applied physics,2003(12):7401-7403. |
| [5] | Zhou G Y;Zhang X W .[J].Rare Metal Materlals and Engineering,2007,36:407. |
| [6] | Wang X X;Tang X G;Chan H L W .[J].Applied Physics Letters,2004,85:91. |
| [7] | Shieh J;Wu K C;Chen C S .[J].Acta Materialia,2007,55:3081. |
| [8] | Li Y;Chen W;Xu Q et al.[J].Materials Letters,2005,59:1361. |
| [9] | Guo Y P;Kakimoto K;Ohsato H .[J].Applied Physics Letters,2004,85:4141. |
| [10] | Saito Y;Takao H;Tani T et al.[J].NATURE,2004,432:84. |
| [11] | Dai Y J;Zhang X W;Zhou G Y .[J].Applied Physics Letters,2007,90:362903. |
| [12] | Zuo R Z;Fang X;Ye C .[J].Applied Physics Letters,2007,90:092904. |
| [13] | Kounga A B;Zhang S T;Jo W et al.[J].Applied Physics Letters,2008,92:222902. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%