Control of interfacial structure of potassium niobate-barium titanate ceramics and their dielectric properties

K. Yamashita, S. Shimizu, I. Fujii, K. Nakashima, N. Kumada, T. Tsukada, T. S. Suzuki, T. Uchikoshi, Y. Sakka, S. Wada

研究成果: Conference article査読

1 被引用数 (Scopus)

抄録

ANbO3-BaTiO3 (AK, Na, or K0.5Na0.5) system ceramics were prepared using a conventional sintering method, and their dielectric properties were investigated. It was found that the dielectric constant of KNbO3-BaTiO3 system ceramics did not strongly depend on temperature between 20 and 400 °C, making them useful for capacitor application. However, the dielectric constant of KNbO3-BaTiO3 system ceramics was low. The high dielectric constant is attributable to a large area of interfaces between KN and BT grains. Ceramics sintered by spark plasma sintering (SPS) are expected to suppress a grain growth, increasing area of the interfacial layer. In this study, SPS method was employed to achieve a large area of the interfaces and to see how the dielectric properties change with the interfacial structure. The structure was controlled by changing sintering temperatures and time of the spark plasma sintering. As a result, X-ray diffraction patterns showed that perovskite single phase and their relative densities were greater than 97%. By contrast, the dielectric constant was decreased.

本文言語English
論文番号092065
ジャーナルIOP Conference Series: Materials Science and Engineering
18
SYMPOSIUM 6
DOI
出版ステータスPublished - 2011 1月 1
外部発表はい
イベント3rd International Congress on Ceramics, ICC 2011 - Osaka, Japan
継続期間: 2010 11月 142010 11月 18

ASJC Scopus subject areas

  • 材料科学(全般)
  • 工学(全般)

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