采用溶胶-凝胶法制备了纯BaTiO3、Pr, Mn液相掺杂及气相多元扩渗改性的BaTiO3陶瓷. 研究结果表明, Pr掺杂能使纯BaTiO3陶瓷的室温电阻率下降为1.01×105Ω·m; 而Mn掺杂使室温电阻率升高为1.50×1013Ω·m. 但 Pr和Mn的气相扩渗都能降低BaTiO3陶瓷的室温电阻率至1.08×103Ω·m和1.29×105Ω·m. Pr-Mn共渗BaTiO3陶瓷出现了典型的NTC效应. XRD分析表明, Pr或Mn掺杂并不能改变BaTiO3陶瓷的物相结构, 但经Pr-Mn共渗后,出现了新化合物BaMn0.12Al1.88O4和Al8Mn4Pr的特征峰. XPS分析表明, 气相多元渗使Pr, Mn, C元素都扩渗到陶瓷体内, 并使各化学元素之间的结合更加牢固. SEM测试结果表明, Pr, Mn气相扩渗使陶瓷表面明显改观, 晶粒生长完整, 粒度分布均匀, 气孔率下降.
Pure BaTiO3 ceramics and Pr, Mn-doped BaTiO3 ceramics were prepared by a sol-gel method. The pure BaTiO3 ceramics were modified by the penetration of Pr and Mn in gaseous state, their structure and electrical properties were studied. The results show that the resisitivity of Pr-doped BaTiO3 ceramics is decreased to 1.01×105Ω·m, the resisitivity of Mn-doped BaTiO3 ceramics is increased to 1.50×1013Ω·m, while both Pr and Mn penetration can decrease the resisitivity of BaTiO3 ceramics evidently, which is 1.08×103Ω·m and 1.29×105Ω·m, respectively . The Pr-Mn penetrated BaTiO3 ceramics show a distinct NTC effect. The XRD results show that the perovskite structure of Pr or Mn doped BaTiO3 ceramics does not change obviously, but there are new peaks of BaMn0.12Al1.88O4 and Al8Mn4Pr in Pr-Mn penetrated BaTiO3 ceramics. The XPS results show that Pr, Mn and C element are penetrated into BaTiO3 ceramics, leading to the binding energy of modified BaTiO3 ceramics increase and their stability improve. The SEM results show that Pr and Mn penetration can improve the surface state of BaTiO3 ceramics, the grains become finer and grow more integrally than pure BaTiO3 ceramics, the porosity are decreased visibly.
参考文献
| [1] | Zhao Jingchang, Li Longtu, Gui Zhilun. Journal of the European Ceramic Society, 2002, 22 (7): 1171--1175. [2] 黄仲臧, 沈嘉棋(Huang Zong-Zang, et al). 无机材料学报(Journal of Inorganic Materials), 1999, 14 (6): 939--941. [3] 郝素娥, 韦永德(Hao Su-E, et al). 无机材料学报(Journal of Inorganic Materials), 2003, 18 (5): 1069--1073. [4] Kyomen T, Sakamoto R, Sakamoto N. Chem. Mater., 2005, 17 (12): 3200--3204. [5] 徐荣云. 中国陶瓷, 2002, 38 (4): 7--9. [6] 靳正国(Jin Zheng-Guo).硅酸盐学报(Journal of the Chinese Ceramic Society), 2001, 29 (5): 397--399. [7] 周斌, 徐国跃. 电子元件与材料, 2005, 24(1): 10--15. [8] Hao Su-e, Wei Yong-de, Xing Xiao-xu. Journal of Rare Earth, 2004, 22 (suppl.2): 109--112. [9] Park M B, Cho N H. J. Am. Ceram. Soc., 2001, 84 (9): 1937--1944. [10] 周东祥, 郑志平, 龚树萍, 等(ZHOU Dong-Xiang, et al). 无机材料学报(Journal of Inorganic Materials), 2005, 20 (3): 593--597. [11] Qi Jian-quan, Gui Zhi-lun, Wang Yong-li. Sensors and Actuators A: Physical, 2002, 100 (2--3): 244--246. [12] Affleck L, Leach C. Journal of the European Ceramic Society, 2005, 25 (12): 3017--3020. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%