Size Effect and Domain-Wall Contribution of Barium Titanate Ceramics
Size Effect and Domain-Wall Contribution of Barium Titanate Ceramics
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DOI：
10.1080/00150191003697179
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发表时间：
2010-10
期刊：
影响因子：
0.8
通讯作者：
T. Hoshina;Yoichi Kigoshi;S. Hatta;T. Teranishi;H. Takeda;T. Tsurumi
中科院分区：
文献类型：
--
作者：
T. Hoshina;Yoichi Kigoshi;S. Hatta;T. Teranishi;H. Takeda;T. Tsurumi
采用常规烧结法和两步烧结法制备了晶粒尺寸为0.7 ~ 13 μm的钛酸钡（BaTiO 3）陶瓷。平均晶粒尺寸为1.1 μm的BaTiO 3陶瓷的介电常数在8，000附近表现出最大值。利用超宽范围介电谱研究了畴壁对介电常数的贡献。对于晶粒尺寸大于1 μm的BaTiO 3陶瓷，高畴密度提高了电偶极极化率和离子极化率。而晶粒尺寸小于1 μm的BaTiO_3陶瓷的极化率则有所降低。
Barium titanate (BaTiO3) ceramics with various grain sizes from 0.7 to 13 μm were prepared by a conventional sintering method and a two-step sintering method. The permittivity of the BaTiO3 ceramics with an average grain size of 1.1 μm exhibited a maximum around 8,000. By ultrawide range dielectric spectroscopy, the domain-wall contribution to the permittivity was investigated. For the BaTiO3 ceramics with grain sizes over 1 μm, the dipole and ionic polarizabilities were enhanced by the high domain density. In contrast, for the BaTiO3 ceramics with grain sizes below 1 μm, these polarizabilities were weakened.