Structure and Ferroelectric Properties of Dense Nanocrystalline BaTiO3 Ceramics Prepared by High Pressure Sintering Method
-
摘要: 在6 GPa压力、1 000 ℃温度条件下制备了致密的纳米BaTiO3陶瓷,合成样品的平均晶粒尺寸为50 nm,理论密度在97%以上。通过介电测量,观察到了样品宽化的相变峰,它与粗晶陶瓷的相变峰大不相同。由于90电畴的减少和退极化场的存在,观察到了细长的电滞回线,它是样品铁电性存在的有力证据,表明钛酸钡陶瓷的临界尺寸在50 nm以下。
-
关键词:
- 高压烧结 /
- 铁电 /
- 纳米晶BaTiO3陶瓷 /
- 电畴
Abstract: Dense nanocrystalline BaTiO3 ceramics with a grain size of 50 nm were prepared under 6 GPa at 1 000 ℃ using a high pressure sintering method. The sintered bulk is uniform and the relative density is above 97%. We annealed the ceramic samples in oxygen to eliminate the oxygen vacancies caused by high pressure. After anneal, several broadened peaks were observed through dielectric measurements. However, these peaks are very different from those of coarser-grained ceramics. The observation of polarization hysteresis loop provides the solid evidence of ferroelectricity in these nano-sized BaTiO3 ceramics. It is believed that the absence of 90 domains and the existence of depolarization field caused by nonferroelectric grain boundaries contribute to the slim loop.-
Key words:
- high pressure sintering /
- ferroelectric /
- nanocrystalline BaTiO3 ceramics /
- domains
-
Wang H, Yu P F, Tian L, et al. Studies on the Preparation and Dielectric Properties of Barium Titanate Nanometer-Sized Powders and Ceramics [J]. Journal of Baoji College of Arts and Science(Natural Science Edition), 2005, 25(1): 29-33. (in Chinese) 王辉, 俞鹏飞, 田靓, 等. BaTiO3纳米粉体及其陶瓷的制备和介电性能 [J]. 宝鸡文理学院学报, 2005, 25(1): 29-33. Li Q L, Chen W, Chen Sh T, et al. Preparation for BaTiO3 Nano-Crystalline Powder and Study on the Sintering Characteristics of Ceramic [J]. Piezoelectrics Acoustooptics, 2000, 22(1): 37-39. (in Chinese) 李青莲, 陈维, 陈寿田, 等. 纳米晶钛酸钡粉体制备及陶瓷烧结性能的研究. 压电与声光 [J]. 2000, 22(1): 37-39. Frey M H, Payne D A. Grain-Size Effect on Structure and Phase Transformations for Barium Titanate [J]. Phys Rev B, 1996, 54: 3158-3168. Natesan B, Anil G, Chetn B, et al. Phase Transformation Studies of Ceramic BaTiO3 Using Thermo-Raman and Dielectric Constant Measurements [J]. J Appl Phys, 2002, 91: 10038-10043. Buscaglia V, Buscaglia M T, Viviani M, et al. Raman and AFM Piezoresponse Study of Dense BaTiO3 Nanocrystalline Ceramics [J]. J Euro Ceram Soc, 2005, 25: 3059-3062. Zembilgotov A G, Pertsev N A, Waser R. Phase States of Nanocrystalline Ferroelectric Ceramics and Their Dielectric Properties [J]. J Appl Phys, 2005, 97: 114315. Maria T B, Vincenzo B, Massimo V, et al. Ferroelectric Properties of Dense Nanocrystalline BaTiO3 Ceramics [J]. Nanotechnology, 2004, 15: 1113-1117. Zhao Z, Vincenzo B, Massimo V, et al. Grain-Size Effects on the Ferroelectric Behavior Of Dense Nanocryatalline BaTiO3 Ceramics [J]. Phys Rev B, 2004, 70: 024107. Arlt G, Hennings D, De G. Dielectric Properties of Fine-Grained Barium Titanate Ceramics [J]. J Appl Phys, 1985, 58(4): 1619-1625. Kinoshita K, Yamaji A. Grain-Size Effects on Dielectric Properties in Barium Titanate Ceramics [J]. J Appl Phys, 1976, 47: 371-373. Maria T B, Massimo V, Vincenzo B. High Dielectric Constant and Frozen Macroscopic Polarization in Dense Nanocrystalline BaTiO3 Ceramics [J]. Phys Rev B, 2006, 73: 064114.
点击查看大图
计量
- 文章访问数: 14124
- HTML全文浏览量: 705
- PDF下载量: 969