Size Effect and Domain-Wall Contribution of Barium Titanate Ceramics

作者：Hoshina Takuya^*; Kigoshi Yoichi; Hatta Saki; Teranishi Takashi; Takeda Hiroaki; Tsurumi Takaaki

来源：Ferroelectrics, 2010, 402: 29-36.

DOI：10.1080/00150191003697179

• Barium titanate
• size effect
• domain wall contribution
• ultrawide range dielectric spectroscopy

Barium titanate (BaTiO3) ceramics with various grain sizes from 0.7 to 13 m 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 m 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 m, the dipole and ionic polarizabilities were enhanced by the high domain density. In contrast, for the BaTiO3 ceramics with grain sizes below 1 m, these polarizabilities were weakened.

• 出版日期2010