Piezoelectric ceramic composition and laminated piezoelectric element

US7507347B2 · kind B2 · utility

Assignee

• TDK CORPORATION · JP

Inventors

• Kumiko Iezumi · Tokyo, JP
• Junichi Yamazaki · Mishima, JP
• Norimasa Sakamoto · Tokyo, JP
• Takeo Tsukada · Tokyo, JP
• Masahito Furukawa · Tokyo, JP
• Keisuke Itakura · Hekinan, JP
• Hideya Sakamoto · Tokyo, JP
• Yumiko Kozasa · Tokyo, JP
• Masayoshi Inoue · Tokyo, JP
• Masaru Nanao · Tokyo, JP
• Satoshi Ozawa · Hitachi, JP

Key dates

• Filing date: Mar 15, 2007
• Grant date: Mar 24, 2009
• Expiry date: Sep 28, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/79
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Provided is a piezoelectric ceramic composition capable of being sintered at low temperatures and in a low-oxygen reductive atmosphere and capable of attaining a sufficient displacement even at high voltages of 1 kV/mm or more. The piezoelectric ceramic composition includes: a composite oxide, as a main constituent thereof, represented by the following composition formula; Cu and/or Ag, each as a first additive, Cu being included in a content α, in terms of Cu2O, falling within a range 0<α≦0.5% by mass and Ag being included in a content β, in terms of Ag2O, falling within a range 0<β≦0.4% by mass, in relation to the main constituent; wherein: composition formula: Pba[(Zn1/3Nb2/3)xTiyZrz]O3, where 0.96≦a≦1.03, 0.005≦x<0.05, 0.42≦y≦0.53, 0.45≦z≦0.56, and x+y+z=1.