采用（Sr1-xPbx）TiO3系列纳米粉末烧结制备了（Sr,Pb）TiO3系均质与梯度介电功能陶瓷材料,考察了其组成分布、显微结构及介电性能.结果表明,烧结后陶瓷基本致密化,晶粒有所长大（平均粒径约为6.3μm）,其中存在少量圆形封闭气孔;均质陶瓷中Sr和Ph元素分布均匀,梯度陶瓷中则呈阶梯状梯度变化;烧结前后陶瓷相结构明显改变,由原来的立方顺电相为主转变为四方铁电相为主,并存在铁电畴亚结构;梯度化组成有效地优化了（Sr,Pb）TiO3陶瓷的介电性能,工作温度区间及介温稳定性明显改善.
A series of (Sr, Pb)TiO3 system dielectric ceramics with homogeneous and functionally graded compositions were fabricated by sintering process using
chemically-coprecipitated (Sr1-xPbx)TiO3 nano-particles, and their compositional distribution, microstructure and dielectric property were investigated
as well. The results indicate that, the ceramics are nearly densified and their grains coarse somewhat (mean size is about 6.3μm) after sintering. There are
a small number of sealed pores in the ceramics. In homogeneous ceramics, Sr and Pb distribute evenly, while in graded ceramics Sr and Pb vary gradually. The major
phase constituent obviously transforms from cubic paraelectric phase to tetragonal ferroelectric phase after sintering, in which the ferroelectric domains exist.
The graded constitution effectively optimizes the dielectric property of (Sr, Pb)TiO3 ceramics; the work temperature zone is broadened and the dielectric-temperature stability is improved obviously.
参考文献
| [1] | Ktripathi A, et al. Mater. Sci. Eng., 1994, 25: 34--38. [2] Wojciech L Suchanek, Masahiro Yoshimura. J. Am. Ceram. Soc., 1998, 81 (11): 2864--2868. [3] 黎步银，龚树萍，姜胜林，等. 压电与声光， 1997， 19 (1): 57--60. [4] 周小微，徐颍. 功能材料，1997， 28 (4): 415--417. [5] 周桃生，何云斌(Zhou Taosheng, et al). 无机材料学报(Journal of Inorganic Materials)?，1998， 13 (4): 484--489. [6] Partho Sarkar. Proceedings of the 4th international symposium on FGM, 1997. 221--226. [7] Partho Sarkar, et al. J. Am. Ceram. Soc., 1993, 76 (1): 1055--1056. [8] 龚红宇，范素华，赵宗昱，等. 复合材料学报，1999， 16 (2): 53--57. [9] 王德君，郭阈淳，桂治轮，等(Wang Dejun, et al). 硅酸盐学报(Journal of the Chinese Ceramic Society)?，1997， 25 (5): 547--553. [10] 程华容. (Sr, Pb)TiO_3介电功能梯度陶瓷的制备及介温性能. 哈尔滨工业大学硕士论文. 2001. 26--27. [11] 李振荣，张良莹，姚熹. 材料研究学报，2000， 14 (Suppl.): 41--44. [12] 于向阳，程继健, 周欣山，等. 功能材料，2000， 31 (1): 12--14. [13] 王德君，周济，桂治轮，等(Wang Dejun, et al). 无机材料学报(Journal of Inorganic Materials)，1996， 12 (2): 231--236. [14] 范素华，龚红宇，李球生，等. 中国陶瓷，1998， 34 (2): 5--8. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%